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Rough idle, surges

Runs rough while driving engine surges with acceleration

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 32 Answers

SOURCE: rough idle, surges when cold

have it scanned,ck' tps sensor,mass air sensor,idle air sensor for output...kev-mn.

Posted on Dec 10, 2008

  • 156 Answers

SOURCE: 1996 FORD CONTOUR 4CYL ROUGH IDLE ROUGH ACCELERATION

no problem. If you are getting that low of voltage on a load then you might want to test the alternator as well to make sure it is running at capacity.

Posted on Feb 23, 2009

emissionwiz
  • 75797 Answers

SOURCE: 1999 Ford Windstar, idles rough, slow acceleration

sounds like a large vacuum hose was knocked off the engine when they pulled the trans out, have that checked.

Posted on Mar 26, 2009

honeymokey
  • 3113 Answers

SOURCE: Our 2001 ford focus when it idles it surges

Check the pcv hose for leaks at the intake manifold. Common problem.

Posted on Jan 23, 2010

  • 921 Answers

SOURCE: 2001 Ford Explorer idles rough when at a stop in

sounds like a vacuum intake leak..check a those little tubes for cracks and security. also check your transmission levels, this will sometimes cause a surging problem while driving..if all this checks good then it might be dirty or clogged injectors..purchase a can of Sea Foam from Autozone $10 pour in 1/2 can to half tank of gas and drive around for thirty minutes..highway driving preferred, and see if that will clean up the fuel system.Can i get some feedback, thanks

Posted on Apr 27, 2010

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2 Answers

Idles roughly, then low when stopped or in park, then dies. Decreasing gas mileage. Slow to accelerate


Sometimes that's caused by a vacuum leak near the manifold area.

Sometimes air in the coolant will cause an idle problem. Air will keep the air temp sensor from sending proper info.
Hope this helps.

Jan 03, 2014 | 2004 Ford Taurus

1 Answer

Rough idle/ not accelerating/coolant leak


Rough Running Engine - James on Engines #2 - Bell Performance

https://www.bellperformance.com/blog/rough-running-engine
Apr 21, 2015 - When diagnosing an engine with a rough idle, there are certain things that must be ... If the problem does not reoccur, the codes will be erased by the computer. ... when accelerating the vehicle, which causes a higher fuel demand. .... it was water in gas...added added Gas LineAntifreeze/Water Remover.

Mar 17, 2017 | 2000 Ford Focus

1 Answer

Ford E-350 2001 V-10 gas. 70k mi. - problem developed suddenly, no gradual lead up. - runs rough, stalls both driving or sitting idle, seems to surge a little i.e. surges above idle rpm while sitting. was...


Check your fuel vapor recovery system, your van has unusual set up, and the effect is RAW fuel gets purged, rather than vapor.
The dead giveaway test is does the issue happen on light acceleration? Does it stop if you let off the throttle? Can you accelerate harder and "get past" the issue?

Dec 12, 2010 | 2002 Ford E350

2 Answers

It surges at idle and stumblesunder mild


I want u to clean the air intake valve and idle speed control valve, follow the procedure below.

Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

let me know in a few days if this helps.

Feb 21, 2010 | 1994 Ford Taurus

1 Answer

I have 2002 audit quattro TT with 180k miles. When I do a normal acceleration the car surges and rpm drop but pick back up. If I accel hard it runs fine. Also at idle at times it varies 200 rpm like a


this sounds similar to a problem i had. as the rpm went over 2000 the engine would stop for a split second and then kick back in.
after a few days looking my garage finally found the problem was a faulty air mass meter.
this cost me £200 in total to be repaired.

May 06, 2009 | 2002 Audi TT

1 Answer

2003 cartier 4.6L 120K miles. Rough idle, at idle only.


has anyone checked for a vacum leak? a vacum leak will cause rough idle at idle. check the lines from the pcv valve.

Mar 21, 2009 | 2003 Lincoln Town Car

2 Answers

2003 cartier 4.6L 120K miles. At idle, and idle only, the engine will run a little "rough". When I accelerate, no problems at all. Any ideas?


Try this.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Mar 13, 2009 | 2003 Lincoln Town Car

1 Answer

I have a 1988 Chevy C3500 1 ton PU. Engine runs great at idle and acceleration but when cruising it runs rough or surges.


if the truck has a locking converter goin bad it will surge at steady speeds such as 55 mph the converter will lock and unlock causing you to feel an surging

Mar 07, 2009 | 1988 Chevrolet C3500

2 Answers

Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

Feb 07, 2009 | 1997 Chevrolet Astro

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