Question about 2002 GMC Yukon Denali

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I have a miss in my 2002 gmc yukon

I filled the gas tank up yoday and when i started it up it only idled at about 400 rpms and i i didnt notice anything until i got of work and the service engine soon light keeps flashing and it feels like im only running on 4 or 5 cylinders its really bad on hills any help would be greatly appreciated

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  • GMC Master
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Have the vehicle checked for code's . will show what cylinders are missing . Do drive it like that , check engine light flashing , will damage the catalytic converters

Posted on Jan 15, 2018

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Anonymous

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SOURCE: 2002 GMC Envoy is having

I ran into this concern with my 2002 and my wife ran into the almost identical problem with her 2003. this may sound silly,, but it was the clutch fan. Extreme loss of power from time to time came first. Then a roar of the what seemed like the engine when stopping. Actually cut off after it started to roar at highway speeds, and had absolutely no excelleration from time to time. Sometimes all of the symptoms completely went away. After taking mine to the dealer several times, finally they got it right and replaced the fan clutch. When my wifes 2003 SLt started doing the exact same thing as my 2002 had done, we both knew what the problem was, and the dealer did a quick fix. $600.00. Perhaps this should have been a recall feature, but never was. Everyone that I know that has an envoy, somewhere around the 72,000 and 103,000 mile mark has had this problem and have had to have the clutch fan replaced. It may sound like the vehicle is going to have to be junked,, but that is all it needs.

Posted on Dec 01, 2008

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Anonymous

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SOURCE: Truck losing power and service engine soon light on

Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.

Posted on Feb 02, 2009

Anonymous

  • 1 Answer

SOURCE: 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

Posted on Apr 18, 2009

Anonymous

  • 1 Answer

SOURCE: Heated seats won't stay on in 2004 GMC Yukon Denali

There is a widespread problem with electrical shorts with the seat warmers. I bought the extended warranty through CarMax and theyy fixed it. Retail repair cost on that would have been $900+. It may be covered by GMC via a recall, but only if you raise enough hell.

Posted on May 05, 2009

Anonymous

  • 18 Answers

SOURCE: at about 4000 RPM the check engine light flashes

Your catylatic converter may be clogged if your loosing power or top speed is less than it was. You can check this when its running with a battery operated infared heat gauge. the temperature of the muffler should be around the same temp. as the catylatic converter.

Posted on Sep 24, 2009

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