Question about 2002 GMC Yukon Denali

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Truck keeps stalling

My 2002 Yukon Denali starts but then the engine idles up and down(as if it were jumping) till finally it idles really low and if i try to give it gas ,nothing happens and then the truck stalls. I turn the key again, it starts and the same thing occurs.

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  • robgar79 Dec 06, 2008

    Yes, the check engine light is on but i dont hear a sucking noise in the engine

  • autodr
    autodr May 11, 2010

    is the ck engine lite on? sounds like maybe a vacuum leak. is there a sucking sound in the engine when running?

  • Anonymous Mar 20, 2014

    2002 chevy tracker 4c would not idle started stalling now wont start at all firers 1 or 2 times then nothing

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You have a leaking manifold gasket

Posted on Dec 08, 2008

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Try to get a scan code . it may be the throttle sensor or a number of things.they san for free at AutoZone.

Posted on Dec 06, 2008

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Posted on Jan 02, 2017

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My 99 Yukon Denali 5.7, starts and idles great, but sputters while driving between 40 & 80kms, codes p0137 and p0131. We know what they are tho


Did u change distcap..may be corroded inside. There r two sensors gettn low voltage. Sounds like the othr is not heating properly too. A data stream run at a private shop is really helpful

Jun 11, 2015 | 1999 GMC Yukon Denali

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I have a 2002 Yukon Denali. The other day I went


check for loose battery connection. or maybe a cable going bad. they can corrode inside and the copper wire will turn green

Mar 11, 2009 | 2002 GMC Yukon Denali

3 Answers

I have a 2002 gmc yukon denali xl with 6.0L engine and i have a brand new alternator and battery, but when i brake medium-hard, the voltage drops to around 5 on the meter and the lights flicker. sometimes...


my 2002 had same problems and to fix, I loosened the hose clamp on the throttle body air intake to air box hose. Then opened the butteryfly by hand and used throttle body cleaner, used carb cleaner on another, and removed all the black grime that collects around the throttle body butterfly. About every forty thousand miles i have to do this. I have 123k on mine now and have done it three times. Fixes the low idle, dying in reverse, lite flicker and alternator dropout.

Home it works, if it does
thanks
egwj@aol.com

Mar 06, 2009 | 2002 GMC Yukon XL

3 Answers

2002 gmc yukon, rich fuel code, low fuel pressure @40


you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.

Dec 24, 2008 | 2002 GMC Yukon Denali

2 Answers

Rough Idle for the first couple of minutes then smooth...


1.-remove trottle body and clean it really good 2.-clean your EGR valve with some carb cleaner 3.-remove air intake pipe and clean MAF sensor with MASS AIR FLOW SENSOR CLEANER,make sure your air filter still in good condition. i did this on my 02 xl denali now the problem its gone!trust me!hope this helps on yours too

Dec 06, 2008 | 2002 GMC Yukon Denali

3 Answers

2002 GMC Yukon, erratic idle(hi-low) when cold. 125K miles.


i now for a fact that it is the egr valve . carbon balls in side you have to take it of and clean them out

Nov 17, 2008 | 2002 GMC Yukon Denali

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