Diesel engine surging at idle. No warning indicators stay on and the gauges are normal.
Diesel engine surging at idle. Jul 12, 2025 · Engine surging can be caused by various issues like vacuum leaks, faulty spark plugs, clogged fuel injectors, and fuel pressure problems. the IPR during these times is in the mid-30% range while the ICP is around 600-800psi. Jul 24, 2017 · Hey i have a 2004. DO NOT REV or drive the truck with this unplugged, its only a diagnostic test. And i have my egr unplugged. Try running 2-stroke oil in your next batch of fuel to see if that clears it up a little. ” If your surging mower is a Sep 16, 2018 · My trucks idle surges while at a stand still and is driving me nuts! It’ll be fluctuating around it’s normal 650 rpm then drop down to around 450-500 and shoot back up to 1000-1200 rpm than return back to its “normal” idle. The truck runs great and doesn't demonstrate any serious problems under load. My driver said the truck Feb 6, 2025 · The really bad surging in gear that I was having kind of disappeared on its own after running some fuel injector cleaner through. This issue us accompanied by a surging/loss of power. 9 cummins with the G56 transmission May 5, 2009 · So I thought it might be the airbox temp sensor, I was wrong. When driving it feels like something is opening and closing off the exhaust. Detroit Diesel engine rpm surging at idle - diagnosing and replacing the quantity control valve Tony A 5. Took it to the dealer last fall and after telling them what was happening and searching the forums the Fuel Pressure Jul 29, 2023 · Addressing engine surging at highway speeds is essential for a smooth and safe driving experience. Learn how to diagnose and fix the issue. So, what are some of the most common causes of a rough idle, and how can you fix them? 1. It started demonstrating a serious surging problem recently. It’s typically caused by: Disruptions in the fuel supply Dirty or defective air filters Faulty spark plugs or ignition coils Malfunctioning throttle position sensor Failure of the mass airflow sensor In this guide, we’ll look into the mechanics of engine surge, its causes Aug 19, 2010 · I just bought this truck and have lots of plans for it. Feb 3, 2025 · Engine surge at idle causes uneven engine performance, affecting ignition timing, fuel injection, and engine control modules, resulting in rough idling, misfires, and decreased fuel efficiency, requiring diagnostic troubleshooting and repair. Mar 27, 2017 · So, you had the surging prior to the 2nd gen swap, but now it's worse or more noticeable from your description, correct? You already had the Fass 150 on the truck prior to this? How many miles on your fuel filters? You said you checked rail pressure, what about fuel pressure from the Fass? Feb 21, 2017 · Long time lurker, first time poster looking for a little help on diagnosing an idle surge. EFI blown engines that i have had experience with idle like a stock engine. If left unresolved, a rough engine idle can lead to poor gas milage, starting issues, and even major engine problems. Dec 21, 2009 · Surging idle is a classic symptom when these parts start on their way out. Oct 6, 2016 · 1996 gmc 6. Now it does it often. GM 6. It tends to rev up and then back down Aug 20, 2022 · My 2014 is idling rough and surging while driving down the road. 18, 2005 Jun 9, 2008 · Hello all, I have an 01 CTD with approx 167K that has a strange problem. Oct 9, 2007 · RSV has good steady state control characteristics in the speed range however is nowhere as sweet as RQV particularly at idle governing where it can be prone to surge if not set 100% with no load on the shutdown lever. From diagnosing common causes such as vacuum leaks and ignition system problems to implementing preventive maintenance measures, taking care of your vehicle’s engine is crucial. All I did was a screen record, do you see anything out of ordinary? Jul 23, 2020 · What causes an engine to idle up and down? Causes of a rough idle. And every so often it will Oct 14, 2020 · Honda Surging Repair This video covers the complete repair of a surging Kohler engine. The larger displacement engines are more sensitive to fuel delivery inconsistencies at low RPMs. Oct 8, 2020 · Two-stroke engines have been around since 1881 but they are by no means perfect. I have an MM3 and monitoring some rail pressure. If i shut off the truck, and immediately start it back up, the idle is normal again, but If I goose the throttle, it will stay too high again. 7L megacab that I recently bought used. The headlights will dim and voltage meter drop each time. Nov 24, 2018 · so lets get to the chase here. 7 diesel with about 23,000 miles and just started noticing that I was feeling a surge when under a load on or off cruise at constant highway speeds. This can happen due to a variety of reasons, including carburetor problems, clogged air filters, fuel issues, ignition problems, or even faulty wiring. Feb 18, 2012 · Couple weeks ago, I posted about my tractor surging slightly while running at full throttle (pedal throttle 1900 rpm) on the road Was very slight to the point that it was almost not noticeable. Avoid removing it unless you’re left with no choice. Its a black 2 pin connector. Feb 7, 2020 · Plugged a bd high idle switch in just to see if it’d maintain set rpms. Firstly, check for any vacuum leaks in the engine. There are actually quite a few possible causes, which I run through here + how to fix each one. Over the last few weeks I have noticed the truck surge a little bit when in reverse, idle and at cruising speeds. I'm running and SCT live wire with the 345 KEM tune. I just noticed it today. John Deere engine surging is a result of an inconsistent combustion process in the engine cylinder (s). No warning indicators stay on and the gauges are normal. 0L Power Stroke Diesel - Surging and Rough Idle - Solved - Since it took me over a year to figure out the problem, I thought I would make a post to potentially help others with the same problem. Tractor ran normally for 1 hour after adding said fuel, then the Aug 1, 2020 · My 95 is starting to surge at idle. Using a scan tool you can compare desired and actual rail pressures to often determine if there is a problem. And then do it again in about 3-5 seconds repetitively. May 24, 2025 · Is your car idling roughly? Learn about engine surging issues, from common causes like vacuum leaks to potential sensor problems, and get your car running smoothly again. It’s got 55k miles and is bone stock. 5 lly duramax. Goes up to 48v occasionally. On my 4th or 5th test tune. I always leave my truck idling while fueling up, sometimes I'll high idle it. Flexable fuel lines fail from the inside out, so if in doubt, replacing the Jan 27, 2015 · 2015 Engine Surging at idle in gear Jump to Latest 24K views 17 replies 12 participants last post by ktmrfs May 13, 2016 D. Truck has been to the local ford dealer 6 times and still can't fix the problem. 6 seem to give a surge at idle my rpms will jump a couple hundred rpms for a second and then right back the whole time I am sitting at the light. “You typically see it more with mechanically injected engines versus carburetors, but they both surge. The idle jet is famous for blocking and causing a Sep 21, 2017 · Hello everyone, I'm new here and have an issue with a Gehl 5640 I recently purchased. 3 Throttle linkage mis-adjusted or damaged Adjust or repair the linkage. My truck would surge when at an idle or going down Aug 13, 2011 · As the title says, my truck has a intermittent surge in the idle. 0. add to it, poor fuel, etc. New EBP,MAF,MAP sensors. And while i found allot of sort of similar questions, mine has some subtleties so i figured i would post it up and see what you guys think. 82 scottsdale K20-6. Inspect the flexable fuel lines from the tank to the fuel pump, if there is even the tinest air leak, surging, hard starting, and infrequently small drops of fuel on the driveway happen. It is possible that a surge is caused by an issue with fuel amount (known as “running lean”), fuel pressure (the unit that governs fuel pumps and regulators Jun 5, 2013 · 2004 OEM 5. That amplified the problem times a thousand. I know that isn't much but I just have a feeling that it is a sign of things to come. Jul 15, 2007 · 2005 Jinma 284 new to me. When I'm sitting at a light the idle will surge 50 - 100 RPM's and it feels like it's also surging forward a bit or at least trying to. Jan 30, 2010 · Had a conversation with a buddy today about blower motors surging at idle. Unless the computer tells them what is wrong they have no idea. its random and doesn't happen all the time. If engine surge disappears, idle speed may have contributed to surge. Very intermittently. We cover things from common problems and maintenance information to performance modifications, ranging from basic bolt-on mods to turbo upgrade guides. My truck has been been like missing or something like its been cutting out when at an idle and it like shakes the whole truck and even sometimes even dies. The problem has been occuring intermittently for several years. Truck has a whitish tint to smoke. Example of the surge is like this drag boat Oct 6, 2022 · Everything you need to know about surging and how it affects your turbocharger, including symptoms, preventions and solutions. you can adjust your idle down if need be. It smooths out when I shift to neutral or park and sometimes will stay smooth when shifted back into gear. 5 turbo k3500 4x4 starts and runs idles with a surge has a pattern the corresponds with rpm improves with engine temp rise but does not stop the May 24, 2025 · Troubleshooting car surging issues at idle: Learn how to diagnose and fix engine surging problems to get your car running smoothly again. May 24, 2009 · I have noticed once in a while my truck will lope like it has a big cam in it or something. 5 inch straight pipe. I have no service history. I was wondering if any updates would fix this issue. It all started several months ago. When I drove it home today (about 60 miles) I noticed a couple of things that didnt seem quite right. Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Truck has 80k miles and engine is still stock. 5. All systems check out except the FICM. This is usually caused by one of three factors Jul 29, 2019 · I purchased a brand new 2019 2500HD Duramax and at 1200 miles I noticed the engine surging during decel. I have a 2009 dodge ram 3500 with 111846 miles on the clock. 9L 2WD AUTO 221,000 miles. Jun 29, 2025 · What would cause a 7. Fuel is clean, filter is recent, checked the coupling alignment and motor mounts look ok. The second problem is an idle surge. I got it starting and running and thought all was good till this afternoon. I thought it may be a cold weather thing Apr 19, 2025 · I have a 2021 Ram 2500 6. Truck: 2005 Ram 2500. I've had several instances where I almost rear ended someone at the light. Dec 15, 2015 · Where to start. 3 idle surge at certain parts of the throttle? It almost seems as if it’s dying as I’m accelerating. Don't seem like a big deal it's just annoying. I would say the longer the truck has Apr 19, 2016 · GM 6. It also sounds like it missing when it downshifts. I just got it a week ago. Thanks Jun 5, 2018 · HI all, you gave me some great advice while I was trouble shooting my Kubota L185 the last few weeks. If got 55k miles on the truck - if its the FPR Sep 15, 2004 · Re: why do blower engines surge at idle? If they are tuned right they dont surge. Jul 19, 2019 · The motor starting doing the idle surging again, I hooked up the autoenginuity to it while it was surging and these were my readings. 7L Cummins. Once at operating temp it no longer surges. The only things left I Jul 22, 2009 · I'm having trouble with my 2004 F250, with the 6. Any ideas what the problem may be? Thanks! Jul 21, 2022 · What causes a diesel engine to surge? Idle engine surging is usually often caused by a fault with the fuel supply, air leak, or the governor system. I also just brought my truck in for this surging issue, and Now I have a new Turbo and the same surging. 6K views 10 replies 8 participants last post by That08' G56 Jan 26, 2024 SertOper8r Discussion starter May 5, 2017 · The video shows me running the vehicle at operating temperature. So I’m thinking of some fueling issues. It has gotten progressively worse. When the ignition process commences, the compression-ignition equipment may experience an imbalance, leading to its shaky performance, as seen with a "diesel engine running rough at idle. So any help greatly appreciated. If your LB7 is loping/surging at idle, especially when in drive, this is one possible solution to your issue. Luckily, the Honda carb employs an idle jet, which is accessible without removing the carburetor. I've heard this could be the FPR or it may just need some lubricity (sp?). Adjusting the Idle screw does nothing except make it stall more often Mar 14, 2011 · I did however get the bulletin from gm its Document ID: 1730759/#pip3328C: Diesel Engine surge at 1100-1400 RPM- Keywords calibration chuggle ECM idle software speed update- Nov. Stuff I used in the video: BUY A CHEAP NEW CARB $10-25 most engines: https://amzn. Engine surging can happen when the vehicle is idle or being driven. It also seems to take a bit of time after we start it before it starts to do it but after its Feb 1, 2024 · If your surging issue is directly related to a faulty ICP sensor you can disconnect it then run the engine and go for a test drive and if surging goes away then you know you need to replace the ICP with a new one from Ford. We would like to show you a description here but the site won’t allow us. the truck is deleted with an ez link tow tune. Engine speed surges at low or high idle 1 Fuel level low Check/fill the tank. Nov 14, 2007 · Mornings and evenings when stone cold, the engine is slightly surging at idle, just enough to detect on the tach but you can hear it, a pretty rapid surging. 0 has started surging at idle - Hi, Just bought a 2006 F250 with 6. This is my first time owning a diesel. The delete was done almost two years ago, which makes me wonder why it hasn't done this until now if it has to do with the delete. Mar 30, 2006 · RPM's shuld be smooth and constant at idle if all is well. Engine--Shibara 3 cylinder 25hp. Lost few times I’ve run it, it’s surging at idle, low and higher RPM. It feels like the engine revs up and down quite a Mar 3, 2007 · With very light throttle and sometimes at idle i'm getting a pulse. Its not giving any codes or anything. The first time I start my truck for the day it does this crazy surging. Dec 1, 2020 · DieselIQ is dedicated to PowerStroke and Cummins diesel engines. Jun 25, 2007 · Idle is silky smooth, no rough running on initial starts or any other observed running difficulties. Expert tips inside! May 31, 2009 · 6. Aug 24, 2017 · Hi all, I recently noticed some strange symptoms while driving 65-75mph at constant speeds only while under load or going up hill. When the outside air temp is below 55 and the truck is cold it surges. Which I'll never go back, lol. Jul 13, 2015 · The engine is surging and seems to have more power because the injection pump uses the incoming fuel pressure from the lift pump to operate the timing advance mechanism inside the injection pump. The appropriate fuel system cleaner added to the fuel tank can open clogged passages in injectors and carburetors that may be causing the surge. But at light throttle it surges. If basic fixes fail , exploring advanced solutions like ECU reprogramming or upgrading key components may deliver Dec 17, 2018 · I am not an expert here, but my '17 6. I replaced the IP with a rebuilt I had bought at a reputable shop after purging the air in the system I got it started I noticed it was surging and eventually stalling while idling Feb 14, 2021 · April's Cummins of the Month is now open for entries! Surging at idle while cold Jump to Latest 5. What Is Surging? If the engine’s idle speed is not constant but is increasing and decreasing, it is known as surging. When Jun 9, 2008 · Engine surges when warm in gear, stopped with brake applied. The good news, however, is that in many of these cases, you can repair engine surges with minimal costs. For some reason, whenever I start it and it's cold, the engine surges / lopes pretty bad. 5L Turbo Diesel DB2 Student Handbook. 44K subscribers Subscribe Silly question but is the AC on! Some diesel engines will surge at idle if the AC is on, about every 5 seconds or so the rpm will climb as the compressor kicks in. Smooth throttle response. I was letting it set and idle but after about 5 minutes it surged like someone stepped on the foot throttle. Apr 14, 2012 · Sometimes I can get the engine to idle for several minutes at 650 RPM and at 2100 RPM, and most speeds in between. There are several steps you can take to fix this problem. The most common culprit is a tiny air leak in the fuel system somewhere. Could this be the PMD? or should I be looking for something else? The PMD appears to have been changed some time ago as the bolt nuts are rusty and it is remotely installed on the fender well. 7 Cummins. If your mower engine is a Honda or Kohler, the fix is simple. 7 Cummins engines. 5L Turbo Diesel DS4 Student Handbook ASE-8 Module-16 6. Find out the common reasons for surging, such as a dirty air filter, bad spark plugs, or a faulty fuel injector. Mar 5, 2012 · Here is a list of other stuff. Aug 23, 2023 · Clogged fuel filters, vacuum leaks, faulty fuel pressure regulators, and catalytic converters mainly cause diesel engine hunting and surging. With the Incorrect idle speed settings or fuel mixture adjustments, and malfunctions in the fuel vapor recovery system can upset engine idle capabilities of carbureted engines. so far the shop has replaced injectors, fuel pressure regulator, mass air sensor, air temp sensor, and crank sensor. The motor surges on and off while I am driving. That's the best way I can describe it. Explore common causes and learn how to address this issue for a smoother driving experience. First time I dropped it off (at 95,000 miles) for a severe bucking or surging at idle, they found a bad mass air flow sensor and an EGR Cooler. I was hoping that would fix it but it didn't. In defence of the pump shop did your tec send the pump off with or without all the monkey motion shutdown levers attached? Oct 16, 2005 · 4. With our step-by-step instructions, you can diagnose and fix the problem quickly and easily. These leaks can cause an imbalance in air/fuel mixture and result in surging. Problem fixed. There’s actual, desired, and rail pressure rationality for the PIDs. My problem is the truck surges at idle. And, if the fuel supply is clean as well as good… Read More »How Do I Fix Kohler Engine Surging? Jan 24, 2020 · Hey all, My truck, 2014 3500 with straight pipe, DEF/EGR delete & MM3 tuner, recently started to surge or lope but only when I'm usually accelerating or barely feathering the throttle. All though the fuel filter indicator light came on but went back out once I turned the truck off and back on. Truck Mar 14, 2018 · Just installed another engine with 128,000 miles on it, idles rough, surges, and also at times throttle picks up on its own and it makes a spark knock like noise and blows a big cloud of smoke, if your sitting still in park and gradually bring the rpms up when it gets to around 2500 rpm it revs Dec 11, 2023 · After viewing this article, mower owners will quickly understand what causes Mower Engine Surging at Idle and how to resolve the problem. If you want to eliminate it completely, its probably best to change out the FPR. Check the injectors and replace any malfunctioning injectors. Jun 15, 2007 · I have a 2004 f-350 with the 6. While in idle, the truck will act like it’s going to stall out (drop rpms) then never stall out. While driving, the engine will randomly Nov 5, 2024 · This problem is generally referred to as engine surging, otherwise termed deceleration cycles or rapid acceleration. The best way to determine if your idle air control valve is the issue is to check engine Jul 6, 2010 · After getting bounced around the other day in a storm our engine (volvo md7b) has started to surge up and down in rpm. to/4411LC9 Carb Cleaner spray: WALMART is around $2 Jan 29, 2019 · Try the easy fix first–replacing/cleaning & gapping the spark plug before attempting carburetor work. 1 is that when you come to a stop when it drops down to idle the engine surges from 900 rpm to 400-500 rpm and back several times and Mar 9, 2022 · An engine or motor surge is caused by an imbalance in the computer system which cannot be corrected within the parameters of the vehicle's operating program, in other words there is a mechanical problem. Apr 26, 2020 · Tractor--New Holland TZDA25 Subcompact. Mar 16, 2013 · I am having an ongoing problem with a surging idle. Lots of threads going on this forum regarding the same problem. Seems to do it most at 1500-1700 rpm in 6th gear, light throttle up a slight incline. However, RPMs still sometimes go up up and down without my help. The usual problems lie in the air filter, gas cap, fuel lines, or carburetor. Feb 15, 2010 · My 2005 International 4300, DT466 started surging or loping at idle and has done it going down the road. (44-46v) on cold start up. . 1996 GMC vin F, auto trans, 4x4, 182,000 miles Just bought this truck two weeks ago and haven't driven it until today. I have severely steep hills on my property. I had some bad surging and engine smoking last year and got the carb replaced and that seemed to fix it. If you need more help, check out the “How to fix a surging mower video. As stated in the video, there are several things Oct 20, 2023 · I have a surging idle all the time nearly / rough idle especially when first starting the vehicle after sitting a bit; while occurring Rpm's fluctuates between 500-800 mostly but sometimes however can reach 1000-1100 on the high end of of the rpm oscillation and from what I've noticed from times Dec 21, 1999 · My 1986 Universal M-18, (14 hp FWC) diesel is surging 100rpm at any setting between 1400 and 2000 rpm in gear. 136 hours. I did have it at the dealer a couple weeks ago and they did the latest updates. The issue occurs when the truck is idling and I am holding the Nov 26, 2018 · Surge or Lope at idle 1) Fuel pressure regulator: Map actual versus desired rail pressure, if the graph has a “shark tooth” pattern and there is no air in the system, it is usually caused by a bad fuel pressure regulator. I watched my boost gauge while it was doing this and it was bouncing Dec 6, 2006 · The surging idle on my truck went away for several months, but it has returned although a little milder. Any ideas Jan 29, 2022 · Months ago my engine started surging when idling. 0L. If the engine is surging at idle (RPM fluctuations) it is a good indicated of a bad FPR. I have 08 6. On a very cold morning it will still smoke a Learn what causes a small engine to surge and how to fix it. Aug 29, 2023 · Bad Idle Air Control Valve A bad idle control valve can also lead to fluctuations in the RPM. When Discover more answers 7. A week or so ago, it surged once at idle at a lighht. Any advice or help would be greatly appreciated. This does not happen all the time, the issue comes and goes. It. Cleaning the blocked fuel filters, sealing vacuum leaks, and replacing faulty components in the engine are required to fix the problem. mrfxit, Nov 5, 12:22am Copy 200 or 300 rpm is a lot on most commercial & older diesels That's about the same difference between 100kph & 120kph on my Surf mrfxit, Nov 5, 12:25am Copy May 10, 2025 · What causes a 25 hp Kohler engine to surge at idle? Idle surging in larger Kohler engines often results from idle circuit contamination in the carburetor or incorrect idle mixture adjustment. If you’re noticing that your RPM are constantly going up and down, even when you’re not accelerating, it’s likely that you have a bad idle air control valve. Everything else aside get yourself a laptop, download FORSCAN and order yourself the OBD2 adapter needed. When the fuel pressure goes wacky supplying the injection pump, it affects the timing advance and makes the engine surge forward randomly. it doesnt do it all the time but alot, the check engine light is Nov 27, 2023 · I did some searching through the forum and on Google as well. 7 turbo surging - I have a 2016 F250 6. like a exhaust brake on full then open. More specifically, it is caused by inconsistent delivery of fuel and/or oxygen to the combustion chamber. Engine surge through most speed ranges; however, mostly noticeable at highway speeds. " This roughness is attributed to factors such as inadequate combustion atomizing Mar 13, 2025 · A surging lawn mower engine is a symptom of an imbalance in the air-fuel mixture delivered to the combustion chamber. 3 liter ford engine surges or misses on low speed acceleration Why does my 2004 ford sd powerestroke surge at idle and acceleration, the engine light just came on and the surging Oct 19, 2014 · Okay first off I've read all the stickies on the 6. Sometimes at a stoplight in gear and truck wants to lunge forward. Aug 2, 2021 · Last week I went on a 2600 mile road trip and at our last fill up about 400 miles from home, I noticed a surge while idling while fueling up. The IAC (Idle Air Control) valve is responsible for the engine’s idle speed and keeps it constant. For about a month now, the truck surges noticeably bad at low throtttle application, especially when cold. Jun 20, 2014 · Has anyone got a fix for the surging idle at warm up? It is driving me crazy. 0 in it surging. Nov 30, 2011 · My 2005 6. For engines marked (-CH3007D056152) reference DTAC solution 34017 or Service Information Bulletin 03-11-50-8. Brand new (reman) injectors. Sort of felt like someone bumped into your rear. Disclaimer: Under no circumstances will proclaimliberty2000 be responsible or liable in any Why is my diesel engine surging at idle? Fuel Pressure Regulator (FPR) is a device that is in charge of making sure the rail pressure is where it should be. 0L Power Stroke Diesel - 6. May 26, 2009 · 6. As you know, for an engine to fire and produce power, it needs a combination of fuel, air, and a spark from Dec 28, 2023 · Discover the reasons behind diesel engine shaking at idle. If your two-stroke engine keeps surging, this troubleshooting guide is for … Jun 10, 2022 · If your car has engine surging, find out how to diagnose the IAC valve quickly and easily from our expert mechanic in this article and video 2013 Fiat Doblo 1. If I jump on it, she runs fine. It does not do it at idle and will idle just fine. Mar 10, 2002 · The old 18hp opposed cylinder engines I had were real susceptible to having a surging condition when the air filter was dirty. It's up and down about Jun 15, 2011 · Engine surging up and then almost stalling then surging up and then almost stalling. If I increase the throttle, it continues to surge / lope up Idle vehicles with an RPM rate signaling below 600 RPM are called low RPM vehicles. History of truck 149000 miles PMD May 26, 2003 · G'day is it a surge at idle or higher in the rev range? If it is at idle only then i would start to suspect the govenor spring in the inj pump has gone a bit soft, also what is it idling at? Feb 16, 2024 · A common car malfunction is engine surging, and knowing how to fix this in under 45 minutes is a maintenance tip you must master early! Jun 29, 2023 · Engine surge is a fluctuation in a vehicle’s engine speed, often observed as an inconsistent or “surging” idle. Truck runs fine otherwise. 4 High Pressure fuel leak Inspect the high pressure lines, fittings, or delivery valve Aug 12, 2020 · I need input on an issue with my 2004 6. Carburetor Nov 5, 2018 · Hey all, new to the forum and having an issue with my 2016 6. In the guide below we show you the most popular issues and how to fix them, EV's also have surging issues which we address in this guide. 2 The condition occurs at idle, the idle speed is set too low for accessories Adjust the idle. All the carb blown engines seem to have a really hard time when moving from there tuned location since the air changes so much. Jun 18, 2015 · Blower surge by definition So what really is blower surge? “It’s cycling between rich and lean conditions at idle,” explains Hayes. Aug 3, 2012 · Does the surging begin as soon as it is started? If so, unplug the FCA on the back of the fuel injection pump and start the truck and let it idle. Many different problems could result in a rough idle for your car or truck, including: dirty fuel injectors, clogged air filters, bad spark plugs, and a variety of exhaust system issues. Mar 16, 2023 · Introduction to Generator Hunting and Surging When there is a problem like a generator surging at no load, generator surging under load, generator surging at idle or generator hunting problem (or another electrical component, equipment, or device) exhibits obvious differences in behaviour at regular intervals, this is referred to as surging. I have the truck at the dealership right now and they are pretty much idiots. The engine surge is small most of the time (+- 50 RPM off 600 RPM), but occasionally surges +200 and -100 and in rare cases surges +300 RPM. Mar 12, 2025 · Discover what causes a car engine to surge, including fuel, air, ignition, and electrical issues, and learn how to fix them. It will start surging every second and continue doing this until I reach the top of the hill. 2 surge - not at idle! Jump to Latest 14K views 20 replies 7 participants last post by D13 Jun 12, 2009 D Nov 27, 2015 · I'm having an idle issue. . When I come to a stop the idle will surge 100-200 rpm's. No codes etc. The carburetor, governor, or filer may need to be cleaned, overhauled, or adjusted. ” On a mechanically injected engine, which is the fuel delivery on the Mopar engine in the above video, when the engine richens up, the idle drops. Everything I've read thus far as me believe my PMD is bad. However, I have a number of other injector related issues such as knocking, hard cold starts, surging on startup, low boost/power under light-moderate load, excessive white smoke idling/driving cold, frequent regens. Works perfectly with Cruise control. - I then turn it off and back on - I then wait 1 min and turn it back on (idle drops and almost dies) - I then wait 5 min and turn it back on (idle drops multiple times and vehicle surges) - I then show the vehicle behaviour with high idle (temp sensor unplugged) During high idle it never misses a beat and runs awesome. I have read it could be the ipr? But I havnt found any post where they actually got to the bottom of the issue? Any thoughts are Oct 25, 2018 · Hi, I have a 2005 6. Jul 14, 2007 · My 04 has been in the local shop for about 2 out of the last 3 weeks for a surge problem. Truck literally ran away on me had to kill it on the interstate. When the truck is in idle, the truck will rev rpms for a second, then rev back down. 5L EFI Student Handbook Stanadyne Model DB2 Pump Operation And Instruction Manual Stanadyne Model DS4 Electronic Fuel Injection Pump Operation And Instruction Manual Reply Like 9294chevy Discussion Watch at proclaimliberty2000 how fixing a small engine that's surging might be easier than you think. When leaving in the morning my truck will surge up and down till operating temp. 5 stuff and have probably forgot a bunch of stuff already. Replaced TPS with a Standard ignition 6 terminal Throttle Position Sensor TH420. Would something like Nov 14, 2013 · mine has a surge while in high idle, I believe it to be timing, im advanced a good ways right now, once warm it runs smooth. Watching the fuel pressure at idle stays around 5200psi and when it surges up goes to around 9000psi. The Tech at the dealer states "these do this" which I think is a cop out. Sometimes it sounds like i have cam and other times it sounds normal. It surges about 50-80 rpm according to my scanner. I plan to bring it in next May 8, 2025 · If your lawn mower is surging, you’re probably wondering why. Chasing threads, I assume it to be the fuel pressure regulator. Inspect the high pressure lines, fittings, or delivery valve seals for leaks and repair if necessary. "Redblock". Camilleri Discussion starter Nov 17, 2016 · The surging at idle when you start the truck if it is a slow up down every few seconds is the heater grid engaging and disengaging. Nov 15, 2024 · 6. Here's the specifics: - It only seems to do it between 30-50 mph - It only does it while I am trying to hold a constant speed (not accelerating / decelerating - The Jul 3, 2000 · I read somewhere on the net that possible causes for surging Perkins engines (2200-2500RPM ) are dirty fuel and air leaks. 2020 2500- just rolled about 51,000 miles. Idle is eratic sometimes idles at around 1400 rpms steady other times it surges from around 600 up to 1400 and back to 600 and sometimes will stall. Fuel filter is at 41%. head swap to late model 6. 2J TH400. Apr 24, 2025 · Surging at idle is a common issue in 6. I don't notice it when it is cold just when its up to temp. See the image, for example. No surging in neutral at any rpm, and no surging below 1400 rpm in gear. Is it bad to idle a diesel engine? Engine HUNTING surging REVING pulsating etc FIXED permanently. Cold Air Intake. Dec 27, 2013 · It doesn't get very cold here but it has been kind of cool lately. A comprehensive guide for safe troubleshooting and fixing surging issues with your small engine. Check condition of drive clutch and/or belt prior to re-installation. It has gotten more frequent over the last week or so. 4 with EGR and DPF delete. 70K miles and so far never any issues. While a rough idle may seem like just a minor annoyance, it’s actually an indicator that there’s something wrong in your engine. Colder the morning, the worse the problem If driven away straight away it feels mostly okay but will occasionally buck or hesitate under acceleration. Nothing was said about loss of throttle control at MAX RPM. Again Feb 29, 2016 · I have just recently purchased my first diesel truck 6 weeks ago, 2018 6. These machines’ RPMs can go surge up and down, and at full throttle, or pop through the muffler. Honda engines are usually pretty easy to work on, but in truth, removing the carb is a bit of a pain. Honda and Kohler’s surging is commonly caused by a blocked idle jet see “Gas starvation” towards the end of the page. It doesn't happen all the time but when it does it's definitely after the engine has warmed up. Idle jumps up 50-100 rpm. Started after adding 2 gallons of fresh, purchased, fuel that day, when the tractor fuel tank was close to empty. 010" victor head gaskets. 7 has started "Surging" and is most noticeable when cold. I do not notice any smoke when this is happening Discover the reasons behind small engine surging. I have recently run into a problem. The surge could be a complete misfire (combustion omission is maybe a better term for a diesel???) but it is random and would not be of a frequency indicating a misfire on every ignition cycle for a single injector. If surge continues, locate Yanmar’s engine serial number located on engine plate. It does it at idle and while driving. As Aug 7, 2018 · Hello new guy here I have been driving around 1008 military pick ups for years and working on them for many years. So, the engine starts no problem, but if left to idle for too long when it's cold, it will gradually start surging/hunting rpms and plenty of white/grey smoke. I can set it to 2000 rpm and it will run for about a minute then go down to 1500 rpm for a minute then back up to 2000 and repeat. Below are some Jan 5, 2015 · So as I slow at a stop light or start to park my truck, it seems to surge much like a vintage V8 would do with a radical cam. 6. The engine noise gets extremely quiet when it drops down to 500 RPM. It is making an odd revving sound when returning to idle. It doesn't miss at all, but the rpms fluctuate quite a bit. Learn about common causes and maintenance tasks to avoid this issue. 6 Multijet CR diesel. 2 heads, "T"- double square pre cups. When running at idle hot or cold the idle goes up and down about 100rpm. If the idle smooths out, but is loud, you need a new FCA. When coasting to a stop from ~30mph (any speed as long as the transmission is in 2nd gear or higher when beginning the decel) when the truck is around 15mph, the RPM begins to surge 150-200 Mar 20, 2017 · 2016 fluctuating idle/surging idle, GM can't/won't fix it??? Jump to Latest 28K views 26 replies 18 participants last post by Durabiopwr Jun 25, 2021 S Jan 8, 2018 · 6. Every time I start it up now the engine just surges up and down. Called the dealer and discussed with the Service Manager quoting my thinking the FPRV was the culprit. 7L Power Stroke Diesel - 2016 F250 6. Sounds cool at the drive in and all, but what causes it? I used to think it was blown engines with mags that did it, but seems lots of blower motors do it at idle, mag or not. Identifying the root cause is crucial for a successful repair, and we’ll explore each of these factors in detail. I was reading old posts over at the place and some suggested that it was a bad fuel rail pressure regulator (FRPR) or it could also be a loose reluctor wheel on the Why does a diesel engine runs rough on first start Within the initial ignition, a diesel motor might exhibit harsh operation. Learn the reasons, and how to diagnose and repair this common engine issue in under an hour! Nov 3, 2008 · The first problem is that my idle seems like it's too high, I don't have a tach, but i would guess that it is idling at around 1000 rpm. Brand new May 10, 2025 · Is your Briggs & Stratton lawn mower surging? Learn the common causes & simple fixes to get your mower running smoothly again. May 24, 2025 · Troubleshooting a car that surges at idle? Common causes include faulty spark plugs, dirty fuel injectors, and vacuum leaks. For about 6-8 weeks now i am getting a slight idle May 20, 2020 · I started having some surging at startup when cold. Any ideas? Surging on small engines such as a Kohler engine can cause by a lean condition, as any leanness is likely caused by an exposed vacuum leak. It does it only when in gear (and at cold startup but that has been normal from day 1). Next, address any fuel delivery problems. Cleaning/overhauling the carburetor, adjustment of the governor, and/or changing the air filter may be required. 2 Liter Diesel Engine Student Handbook GM 6. Oct 2, 2024 · Discover how engine surging can affect your vehicle's performance. rys xczxx tfdit mwaq lweh sgbczfy qxiyh fxi inw htqyi