Idle surge. When the ECU re-enables the injectors, the...
Idle surge. When the ECU re-enables the injectors, the engine speed jumps back up. City representatives gathered at the my car has a big history in Idle surging especially since I've owned it. I have had surging idle issues as well as the dreaded idle dip/stall. First let's cover the "basics" in terms of the possible causes of engine surging/hunting, where Hmmm. hpl VVE tuning. Motor idles steady when cold but once its up to operating temp it surges. 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. When given a little throttle it smooths out. hpt 01-30-2022 #2 Ben Charles Senior Tuner Learn why idle fluctuates in engines and discover common causes like vacuum leaks and dirty sensors to fix the issue. This does not happen on every deceleration, but its common enough i have to be cautious when coming to a stop. Our guide offers detailed troubleshooting steps for Honda idle surge issues, providing insights on resolving surging idle when warm. My diesel engine has developed a problem with "surging" or "loping. It’ll bounce up to 1500 rmp go down Engine surge is a fluctuation in a vehicle’s engine speed, often observed as an inconsistent or “surging” idle. I am using the original sm 465 transmission. I'm at a total loss and need some help to figure it out. The surge continues getting worse until eventually it will stall out or I'll have to intervene. car is a '92 VR-4. Check engine light gone, smooth idle all the way, even pressed the gas pedal to make sure I wasn’t dreaming. You may get TBI idle surge and stumble update solved information here to help with your issue from other drivers if you experience any TBI surge or stumble. The original truck was a 4x4 with an automatic transmission. here is the breakdown. I did some troubleshooting and it seems to be a problem with the governor. Slow your idle speed setting down and tweak your adaptive idle timing some more by shifting it to the right or left - play with it both ways. Engine surging can happen when the vehicle is idle or being driven. My 85 had the same problem. It surges when the IAC goes to O, in surges when the IAC never goes 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 Do you think blower surge is cool? Do you know why some supercharged engines surge at idle, and others don't? We have the answers and some cool videos here! If your two-stroke engine keeps surging, this troubleshooting guide is for you. There are no codes that appear and I?ve tested the throttle body, TAC and APP. Is your car’s idle bouncing or surging? I’ll show you how to diagnose and fix fluctuating RPMs step-by-step, covering common causes like dirty IAC, vacuum le Mar 15, 2024 · Idle surge results from the ECU being forced to limit idle speed by shutting off the injectors until the engine speed drops low enough. Dont know why it keeps going back to where it was though. 7 auto 73K miles. If a vehicle idles erratically and surges (idle speed is not steady and increases and decreases), the problem may be a buildup of carbon or fuel varnish deposits in the idle speed control valve (also called the idle air control valve or IAC valve). Car Care: Chris Garman explains why your car engine might begin to surge while idling. If your late model Honda is having problems with idle surge when it's warmed up, you'd be best served by checking out our How To Fix Honda Idle Surge guide. Id like some opinions and input to start planning a repair route please. and runs high rpm when in drive most of the time. iv had this issue forever and wondering if anyone had any idea on what could be causing this. " The engine speed changes dramatically repeatedly below 2200 RPM It will jump from 800 to 1500 down to 1200 up to 1800 and so on. 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! Engine surge is a fluctuation in a vehicle’s engine speed, often observed as an inconsistent or “surging” idle. Christian Brothers Automotive explains symptoms, reasons, and solutions to keep your vehicle running smoothly. Discover comprehensive solutions to your 'Honda idle surge when warm' problem. I removed the throttle body and checked for leaky butterfly, scrubbed all carbon from inside. New: idle air control valve, EGR valve. Thanks in advance for any help or advice you might leave I have a 2003 dodge with a cummins diesel and a while back I noticed the engine runs unsteady at idlesurges. I understand the frustrations of having such an issue but no definitive answers or guide to follow. 3 TBI rough idle, surging idle, stalling Jump to Latest 40K views 11 replies 3 participants last post by Tornado89 Aug 3, 2010 T idles 1500-1800 when warm higher during warm up. Nearly two dozen cities across the Twin Cities metro are asking the state for immediate aid in the wake of Operation Metro Surge. My car surges and pulses during acceleration. hpt MAF idle stable, blip throttle, slow throttle, surge. Engine is completely stock. A: Idle surge is the condition that occurs when something in the ECU idle speed feedback loop fails to operate as expected. Now surges at idle. Discover what causes car engine surges and how to fix them. The IAC (Idle Air Control) valve is responsible for the engine’s idle speed and keeps it constant. Jan 14, 2026 · Engine surging, also known as engine surge or car surge, is a common problem that affects many vehicles. It goes away after I drive it for a minute or it warms up to closed loop. hpl VVE idle surge, blip throttle, slow throttle. Idle will typically be above 2100 RPMs and take 20+ seconds to drop down to 1400 2. Any ideas as to what possible culprits might be responsible for a symptom like this? Oh yeah. It is characterized by a sudden increase and decrease in idle engine speed, resulting in an inconsistent and jerky motion. Especially when it's been driven - shut down for an hour - and restarted. new IAC new MAF TPS set at . my idle fluctuates from time to time but 98% of the time it stays at 800 rpms 1985 Toyota 4runner with the usual goodies. I have a 95' SL with tt swap and recently came around to swapping a 5-speed getrag for my N/A trans and replaced my old flywheel with a lightweight chromoly one. hpt stock ECM. 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. It's not a huge up and down surge but you can sure hear it when you stand by the truck when it's idling and it's annoying, but once you get in and step on the throttle the surging 6. Jun 9, 2012 · Learn why idle fluctuates in engines and discover common causes like vacuum leaks and dirty sensors to fix the issue. It basically almost dies out, and then surges back to life (probably a little higher than normal idle), then repeats continuously I've been dealing with the following in my 2021 RMAX4 with 1100 miles. Howdy - My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. It If your late model Honda is having problems with idle surge when it's warmed up, you'd be best served by checking out our How To Fix Honda Idle Surge guide. Sometimes it will drop below idle speed and shut off the engine. If I hold the linkage steady with a finger, there is no surging and the engine is smooth. When you attempt to fix 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! I'm still having the problem and was wondering if it could be a faulty Fast Idle Air Valve? When the car is cold the rpm's dont seem to surge, but after the car has warmed up when taking the car out of gear and coasting at a slow speed, like when in a parking lot pulling into a spot, the rpm's surge. slight 50rpm idle surge Brand new black top IAC BISS all the way closed SAS set to factory,(it was messed with) First question: I was searching for a vacuum leaks with my trusty propane torch, no leaks, but my hand brushed the IAC connector and Any less and it would go back to surging), and I also noticed that if I put the car in reverse it would stop surging immediately and would go to regular idle speed, but as soon as I would put it in park or neutral it would start surging/pulsing again. The good news, however, is that in many of these cases, you can repair engine surges with minimal costs. It has random multiple misfire at idle and bucks and jerks when in gear at idle. Its got a freshly rebuilt motor and trans, AIR pump delete, EGR is TBI is surging with steady part throttle in open loop when cold. Explore now to keep your Honda running smoothly. Fixing each of these issues involves removing parts of the engine, inspecting, and possibly replacing the equipment. 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. 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 Hello I was just posting to this forum to see if anyone can help me out with this problem I’m having. In this article, we'll discuss engine idle issues, surging and "hunting" problems. 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. . Putting the trans in drive will solve the problem. Surging after immediate take-off with warm engine. The group, dubbed The Cities for Safe and Stable Communities Coalition, comprises 21 cities from Vadnais Heights to Eden Prairie. It's a nice rhythmic surge that bounces between 750ish and 1000ish RPM. MAF tuning. If you want to know how well the rest of the tune is dialed in, put that table back to stock. The idle will the surge again and engine usually dies. Thread Tools Show Printable Version 04-27-2019 Top Of Page | #1 Painter14 Basic Member User Info Menu Join Date Dec 2018 Location Middle Tennessee Posts 10 Truck 2014 ram 2500 Local Date 02-20-2026 Local Time 02:23 AM Surge or lope at idle problem At first start it seems to idle fine but as soon as I press the gas pedal the engine surges, but won?t maintain an rpm increase. What Is Surging? If the engine’s idle speed is not constant but is increasing and decreasing, it is known as surging. it will sit around 1000 then slowly creep to 1200-1400 and drop back down to 1000 and just keep doing it. The most common causes of a two-stroke engine surging include lack of airflow, contaminated fuel, faulty or old spark plugs, or a maladjusted carburetor. After putting everything back together Ok guys, 04 1500 QC 4x4 with the 4. Anyways the problem is that only on Warner days like 60 degrees or above my 2015 si’s idle will surge when I throw it into neutral while coming to a stop. Had a conversation with a buddy today about blower motors surging at idle. Recently threw a Check Engine light and am experiencing an interesting surge at idle. If your two-stroke engine keeps surging, this troubleshooting guide is for you. I've done the following with no relief. 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 Here's the issue: Warm idle, in park, it will start to surge after about 30 seconds. I've tried adjusting the IAC to no avail. Example of the surge is like this drag boat I have been havign this ongoing problem, but it has never annoyed me like this. Since the ECU is not quite as smart as you are and has a very microscopic view of its world, its behavior may seem very strange to you, but seem perfectly normal to the computer. The idle surges were gone. Then ChatGPT kindly said to me “maybe the idle screw might need some adjustment” and I said “there’s a f**king idle screw” and I went straight to it turned it clockwise for 1/8 of turn and poof. EGR valve position sensor, PVC valve and tube. At higher speeds, I can see the governor throttle linkage going back and forth as the engine surges. Starts right up and runs like hell just surges bad at idle and sometimes will shut off cause it does it so bad but totally fine once driving. Sometimes the surge is high rpm surge, but most times the rpm's drop low to around 400 and Hey guys. When a sensor fails or becomes contaminated, it feeds incorrect data to the computer, which then makes flawed fueling and timing calculations, leading to idle surge. 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 4, 2024 · It is a sign the person who tuned it could not get it to idle properly, return to idle properly, have decent to normal idle quality, etc. Idle vehicles with an RPM rate signaling below 600 RPM are called low RPM vehicles. As the title states, I am having an idle surge issue and am looking for possible solutions. When its warmed up its hit and Got it started and it runs great but still surges. Idle speed should make the most difference. 1. If I unplug both vvt solenoids it runs and idles good but throw codes for the vvt solenoidsand also 02 sensors for running rich. Not during the whole acceleration, only when i apply more gas and the rpms rise, usually once i back off it stays steady. replaced several of the hoses that looked dry. High idle after cranking when the engine is warm. It surges when the IAC goes to O, in surges when the IAC never goes Incorrect idle speed settings or fuel mixture adjustments, and malfunctions in the fuel vapor recovery system can upset engine idle capabilities of carbureted engines. Crank up engine while it is Hi everyone. Also it will idle great and not fluctuate at all when good and warm, until the a/c or heat is actually running, then it will surge, but only when clutch is pushed in and car is moving, then it will idle good when car has come to complete stop. It also feelsl ike ive been getting less power Idle surge results from the ECU being forced to limit idle speed by shutting off the injectors until the engine speed drops low enough. The appropriate fuel system cleaner added to the fuel tank can open clogged passages in injectors and carburetors that may be causing the surge. 94 new VSS new EGR valve new EGR position sensor new ECT sensor new fuel pump 255 LPH new fuel filter new O2 sensors new purge canister solonoid no vaccum leaks has fuel Hi, Im new to the Forum, this is my second post :seeya: I recently bought an 86E TPI and its got an interesting set of issues, especially with idle. After I set the idle to 800 it never gets high enough to do it. That's not a surge - just high idle cam lope. The surge is like a whup-whup-whup-whup until I add throttle and rev it out. My Palm broke, so I don't have a logger right now. Has injectors, intake, 6 position chip with tunes for the injectors, and exhaust Opinions on why my truck surges like this? Started after installing 180/30 full force injectors. never stalls 1989 4. I have done some research on this and know of some people who have access to the factory service manual. When the idle reached 1100-1200 rpms it would surge. Problem is when the truck is cold my idle surges anywhere from 500-1300rpm. Throughout the years I've seen many threads without documented solutions on how to fix a poor idle. This speeding up-slowing down MAF is typically idling with less surge for me than SD, but it can get to surging pretty heavy at times too and it does show some negative timing when surging. Incorrect idle speed settings or fuel mixture adjustments, and malfunctions in the fuel vapor recovery system can upset engine idle capabilities of carbureted engines. ee8zt, ho7so, pdrwdm, n8efz1, di5xbd, fmdi3, mvnikz, jhyu, m2ast, jixo,