Question about 2002 GMC Envoy

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My 2002 idles rough when stopped in drive some times worse than outhers if i shift to n it smoothes out

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Change the cam shaft silonod

Posted on Nov 22, 2009

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Posted on Jan 02, 2017

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1 Answer

Why does my 2002 dodge neon idle rough when cold any other time runs smooth ?


Sounds like it just is not getting enough fuel when cold. Try using a bottle of injector cleaner from the Dodge dealer. Make sure it shows naptha on the label and do NOT get any on the paint.

If that doesn't fix it be alert to temporary rough idle when stopping at stoplights. That will indicate you will need to have it scanned.

Sep 10, 2014 | 2002 Dodge Neon

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Still Rough Idle After Battery Disconnect


The first thing to do is not set up the idle speed, but to set the Idle mixture screw to lean best idle setting. First, turn in the mixture screw until the engine dies or runs worse, then back out the screw (recommend turning ¼ to ½ turn at a time). The engine should pick up speed and begin to smooth out.

The battery has nothing to do with the idle speed

Apr 09, 2017 | 2004 Mazda 6

1 Answer

Idle good when cold, hotter it gets the worst it idles especially when sitting at stop lights


simple test for a vacuum brake booster
star and run the engine at idle without applying the foot brake
if it gets worse when the foot brake is applied , it is a vacuum leak in the booster ( replace the booster )
otherwise check for failed vacuum hoses including under dash control lines , vacuum leak at the manifold or EGR unit

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1 Answer

Engine Runs Rough at Idle


go to auto zone,its free ck.throtle senser

Feb 19, 2012 | 2002 Ford Explorer

1 Answer

I have a 2002 envoy 4.2 vortec it has a rough idle when i put it in drive but but it does not do it in park and its worse when it cold if i drive it for about a hour it smooths up do not have a code yet...


Hi and welcome to FixYa!

Looks like that you have a faulty TPS (throttle position sensor). If the TPS is faulty you'll have a rough idle when in drive even worse during cold start ups. It is located on the throttle body. Have it replaced and you'll be good.

Hope this helps and thank you for using FixYa! Have a good one!

Jan 27, 2011 | 2002 GMC Envoy

1 Answer

Will not run smoothly when engine warm unless MAF


I would guess you pretty well havew it figured out. Change the MAF sensor.

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1 Answer

Rough idle - white smelly exhaust


the roughness at idle is the shocks .replace the shocks. i had the same problem

Jan 18, 2009 | 2002 Jeep Grand Cherokee

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