Question about 2005 GMC Yukon

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Gmc idles rough in cold weather

I have a 2005 gmc yukon and when you start it on a cold day ( my cold days are usualy in the teens or lower) it bogs down and idles real rough almlst like its going to stall out, if you give it the gas and rev it up it runs just fine. ive never just let it go on its own to see what hapens so i usualy rev it around 2000 rpm untill it warms up and then its fine. i just dont know what it is, the only thing i could think it would be is if the fuel pump is craping out. any help would be great

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  • GMC Master
  • 786 Answers

Check the coolant temp. sensor (It controls warm up RPM, open loop ECU mode) And change the fuel filter every 20,000 miles to prevent water in filter from freezing ( fuel starvation).

Posted on May 29, 2017

  • Joe Stanton May 30, 2017

    Try replacing the coolant temp sensor, it controls cold idle speed. Also change fuel filter, presence of water can freeze resulting in fuel starvation.

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Posted on Jan 02, 2017

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  • 114 Answers

SOURCE: 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.

Posted on Dec 24, 2008

  • 36 Answers

SOURCE: HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.

Try replacing the ignition control module it is located under the distributor cap Cost is around $30.

Posted on Jan 11, 2009

  • 5 Answers

SOURCE: i have a 1994 gmc safari.It seems to have a smooth idle at times

Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!

Posted on Mar 09, 2009

  • 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

tragedy lok
  • 266 Answers

SOURCE: I have a 1999 gmc yukon 5.7 litre v8 4wd with

check the mass air flow,and the tps sensor

Posted on Nov 17, 2009

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1 Answer

It was very cold, the car sat in the garage for 3 days with very lower fuel, now it idles rough and sounds rough, did I ruin something by not having enough fuel when cold?


No,low fuel isn't your problem. If there's enough fuel for the fuel pump to pick up your car should run okay. You haven't ruined anything. It's not your fault.

It is possible that a low fuel level - very low indeed - has allowed debris/dirt into the system and is causing a blockage. However, I think this is quite unlikely to be the problem you have.

You say the car idles rough - does it drive at speed okay? If it drives okay at speed you can rule out most fuel problems .. most.

Backtrack a bit .. has your car ever ran/idled roughly before? Cold weather can exacerbate a problem.

It could be the cold weather- fuel and injections system have cold start devices or sensors of one sort or another. It may be a faulty sensor. Get somebody to do a diagnostic check for you

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sound like battery has weak or battery terminals and post need cleaning. have battery charged and checked, if battery good. alternator not charging battery. if battery over 5 years old more likely battery is bad.if battery too weak head lights wont turn on battery dead this time of year if battery old. cold weather will finish it out.

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My 2007 GMC Yukon will not start in cold weather. When I turn the key over the lights/dash controls come on, but the engine does not turn over at all. Nothing. Put a new battery in and still does it. ...


My 2007 GMC Yukon will not start in cold weather. When I turn the key over the lights/dash controls come on, but the engine does not turn over at all. Nothing. Put a new battery in and still does it. It is a random occurance. Would not start for two days this week so I had it towed to the dealership and the next morning it starts without the service dept doing anything??? Bring it home and two days later it does it again??? Any ideas?

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1 Answer

1998 yukon won't start in cold weather I turn key get a click but no start.


sounds like the battery is just not up to the job,,,,they fale fast in cold wether,,all ways get the bigest most powerfull battery you can fit on a 4x4 and not i say NOT the cheapest this is were biger realy is better or the first realy cold day it go's errr,,,,err,,,er,,,click!

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1 Answer

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The air-conditioner on our GMC Yukon does not blow cold when stopped at a light or such. The fan still blows, but the air is not cold unless the Yukon is moving. Can this be fixed?


Make sure that your coolant is full. That is usualy the cause.When you are at idle there is not sufficent coolant to be pushed thru the heater core.

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