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GMC Forum: mysterious problem??? 08 Yukon denali XL
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Old 01-15-2019, 06:20 PM
jsoda jsoda is offline
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Default mysterious problem??? 08 Yukon denali XL

Hello! I have an 08' Yukon denali XL I have been experiencing an issue ONLY while the car is in drive and ONLY from a cold start and while outside temperatures are very cold as well, like freezing temps. When I start my car and drive it immediately, the first couple times I come to a complete stop, the car does not stop as it normally does, it will come to a stop but rolls a little past where it should and as the car stops, the idle gets super rough and usually the car will completely stall out. It re-starts right after. The car will do this 3-4 times and then won't do it again until the next time I drive it from a cold start again and in cold temps outside. We were told this was a bad solenoid that was inside the transmission. We got 2 other opinions and were told this was a bad throttle body-also had a code suggesting this I believe. After having the throttle body replaced, the car seemed fixed for approximately 4-5 weeks. Now the car is doing the exact thing again. Please help!!!
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Old 01-27-2019, 09:19 AM
jsoda jsoda is offline
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Default Additional symptom??

I just wanted to add some information that may or may not be important...I have also noticed lately, that sometimes when I go to accelerate after already driving on the road, coasting and then press on the gas petal again...the car doesn't immediately accelerate, it bogs down, almost like a choking sensation and then it will accelerate. I'm not sure if this has anything to do with my big problem, but it never used to do this. I just started noticing this right after having a new throttle body installed. ?????
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Old 02-24-2019, 05:54 PM
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larryderouin larryderouin is offline
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Drives a 2013 GMC YUKON XL
Join Date: Feb 2019
Location: Baltimore Metro Area
Posts: 15

Have the Fuel pressure checked, both for pump pressure and system pressure (pressure regulator). Too low and it'll run rough and too lean. Too High and it can run rich. It also may be an idle speed compensator in the throttle body (Idle Air bleed solenoid).
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Old 06-25-2019, 10:36 AM
SteveC SteveC is offline
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I cleaned the MAF & Throttle Body with the appropriate cleaner, and it cleared up those problems for me (2013 Yukon Denali)
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brakes failing, cold start, stalling
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