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Idle surging when warm

I have a 1998 chevy metro and when the engine is warmed up it surges. we replaced the idle kickdown sensor on the back of the carb and that wasnt it. Idels great when cold but when it s warmed up it surges really bad at idle or when the clutch is pushed in. The rpms surge from around 1500 to 2000

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 8 Answers

SOURCE: 88 silverado 1500 surges at idle and runs rough above that.

may be the egr valve

Posted on Aug 23, 2008

emissionwiz
  • 74945 Answers

SOURCE: dodge ram 1500 engine rpms surge at freeway speed

those sensors could cause the issue, clean the MAF 1st, also clean the idle system using the following procedure, the IAC can cause cruise surge. I use this to cure these problems all the time.

Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve (IAC) and throttle valve, 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.

Posted on Jan 13, 2009

  • 1 Answer

SOURCE: Idle surges after warm up and when brake pedal is pressed

1990 22re same problem surge when pedal was depressed thought it was booster or check valve still didnt fix it i even put a brand new booster on it just to make sure still no fix it finnally went away on its own for about a month now it does it just sitting at an idle with out the brake pedal depressed traced all vaccum lines no problem there and still have no clue

Posted on Feb 21, 2009

  • 21 Answers

SOURCE: 2001 Toyota Celica GT RPM surging at Idle

Certainly sounds like the o2 sensors have become contaminated and are not acting as fast as they used to , or are supposed to.

Posted on May 04, 2009

peterrance19
  • 399 Answers

SOURCE: 1990 geo metro engine surges up and down when

hi sounds like your engine is surging due to incorrect mixture now your idle screw is on the thottle cable were it connects to the carb and the mixture screw is on the carb body as an approx guide turn the mixture screw fully in then out two and a half turns that should help but y may need to fine ajust later

Posted on Nov 15, 2009

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