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6.0l Engine Surge At Idle

mightybg

By mightybg
in Ask A GM Technician

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mightybg Enthusiast

mightybg

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I have a 2002 yukon denali with the 6.0l and when the truck is idling it surges alot the voltage drops and the ac kicks out and the lights dim. this is only happening at idle when driving down the road it works fine. I also noticed that when taking off from idle it tends to jump pretty hard, you really have to ease into the throttle or it will jerk your head back. is there TSB on the throttle actuator motor or module? I have no engine light on so no locked in codes. I was told before it was a dirty intake and it was cleaned and the problem came back soon after or didn't go away( this is my wifes car, but she said it was better for a week she thought) I find it hard to believe that if it was a dirty intake and it was cleaned that it would start doing that again so soon after cleaning. I think it might be the throttle actuator having a dead spot or not working right at the idle speed but it should throw a throttle out of position code if it were too bad wouldn't it?

motu New Member

motu

Posted
Posted
I have a 2002 yukon denali with the 6.0l and when the truck is idling it surges alot the voltage drops and the ac kicks out and the lights dim. this is only happening at idle when driving down the road it works fine. I also noticed that when taking off from idle it tends to jump pretty hard, you really have to ease into the throttle or it will jerk your head back. is there TSB on the throttle actuator motor or module? I have no engine light on so no locked in codes. I was told before it was a dirty intake and it was cleaned and the problem came back soon after or didn't go away( this is my wifes car, but she said it was better for a week she thought) I find it hard to believe that if it was a dirty intake and it was cleaned that it would start doing that again so soon after cleaning. I think it might be the throttle actuator having a dead spot or not working right at the idle speed but it should throw a throttle out of position code if it were too bad wouldn't it?

 

I was pretty excited to read your post, because I have a 2001 Suburban C1500 that is doing the exact same thing. After new plugs, new wires, and new fuel filter, the problem persists. Have you solved the problem?

GMTRUCKTECH Enthusiast

GMTRUCKTECH

Posted
Posted
I have a 2002 yukon denali with the 6.0l and when the truck is idling it surges alot the voltage drops and the ac kicks out and the lights dim. this is only happening at idle when driving down the road it works fine. I also noticed that when taking off from idle it tends to jump pretty hard, you really have to ease into the throttle or it will jerk your head back. is there TSB on the throttle actuator motor or module? I have no engine light on so no locked in codes. I was told before it was a dirty intake and it was cleaned and the problem came back soon after or didn't go away( this is my wifes car, but she said it was better for a week she thought) I find it hard to believe that if it was a dirty intake and it was cleaned that it would start doing that again so soon after cleaning. I think it might be the throttle actuator having a dead spot or not working right at the idle speed but it should throw a throttle out of position code if it were too bad wouldn't it?

 

 

Your electronic throttle body actuator is binding do to carbon. Also there is a update for your computer to help address idle stumble. IN short you need a new throttle body and a computer update

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