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What could be making engine to have a rough idle?

Had it to dealership a couple of times,they tell me it's the character of the engine because no codes are showing and all cylinders are firing. Now it*s getting worst.

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  • Harold Siegwart
    Harold Siegwart Nov 27, 2014

    Hi charles gindville, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?What is the make and year ,how many miles on the car what part of the USA do you live in ,many factors thanks just need more to go on .

  • charles gindville
    charles gindville Nov 27, 2014

    2011 gmc canyon crew 5 cylinder with 20,000 miles on it. I live in Philadelphia.The truck runs great on the road,but at idle or in gear it vibrates bad.Had it at dealership they tell me notjing is wrong because no codes are showing up.

  • Harold Siegwart
    Harold Siegwart Nov 27, 2014

    Let check the compression on all cylinders & see i f its a head problem ,another thing could be bad gas try some dry gas , also at night go out side under a dark engine and take a spray bottle and spray down the coils with water mist only and look for arks . If you find a bad one replace it .many codes clear them self's.hope for the best

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  • 37 Answers

A somewhat rough Idle can be usually found in a three cylinder car, thats okay. can it be tuning? does this happen with the AC on?

Posted on Nov 27, 2014

Testimonial: "I have a 5 cylinder and yes it happens when ac is on.the truck rides perfect on road but at idle it is rough more so in drive or reverse,it vibrates really bad ."

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2005 chevy cobalt

I had the same problem. Have it checked at an checkers with one of their computers. I had a multi misfiring. I changed the ignition module on it. It runs great now.

Posted on Dec 03, 2008

  • 1 Answer

SOURCE: P0302 #2 cylinder miss fire code. Replaced plugs

I have a 1999 ford escort 2.0, its got a miss on cylinder 3 and 4. I changed the wires and the coil pack but its still missing. When scanned I get code p1506, p0303 and p0304

Posted on Jan 11, 2010

  • 6 Answers

SOURCE: Engine runs rough at idle and slow speeds.

clean the idle air control with brake cleaner or carb cleaner

Posted on Jun 19, 2010

  • 1311 Answers

SOURCE: Rough Idle 2002 Trailblazer 4.2L could it be the

Clean throttle body first, make sure you disconnect battery foe about 30 minutes so PCM can relearn to cleaned throttle body.

Posted on Sep 11, 2010

jturcotte
  • 7772 Answers

SOURCE: 2000 grand cherokee laredo, 4.7

If your engine light is on, please get a free scan at your local parts chain and send us the trouble codes. Recommend you start by removing the idle air control valve and cleaning the valve and passages as well as the throttle body with carb cleaner. Check the operation of the valve by hooking up the connector and turning on the key (do not start the car) while it is off the engine to see if it actuates. Please let me know if you have questions.

  1. Remove air duct and air resonator box at throttle body.
  2. Disconnect electrical connector from IAC motor (#4 in picture).
  3. Remove two mounting bolts (screws).
  4. Remove IAC motor from throttle body.
  5. clean valve, passages, and throttle body (#2)


jturcotte_292.gif

Posted on Nov 25, 2010

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1 Answer

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