Idle until almost dead

[KahneFan]

When I first bought my (used) 02' TB, it was February of 05'. Around when I bought it, and just now, I will be sitting at a light and it will adle down until it almost dies. It will spudder a little and the idle back up to regular power. Would the gas around Nov-March (South Texas) cause my TB to do this?

[tmleadr03]

Originally Posted by KahneFan

When I first bought my (used) 02' TB, it was February of 05'. Around when I bought it, and just now, I will be sitting at a light and it will adle down until it almost dies. It will spudder a little and the idle back up to regular power. Would the gas around Nov-March (South Texas) cause my TB to do this?

No, but a sticking Idle Air Control would. It can be cleaned (with sensor safe cleaner!) or replaced.

[maxwedge]

Also possible, if I remember correctly, there is a tsb on this for a software update in the pcm, if you cannot correct by cleaning the TB then check with a dealer on this.

[KahneFan]

Originally Posted by maxwedge

Also possible, if I remember correctly, there is a tsb on this for a software update in the pcm, if you cannot correct by cleaning the TB then check with a dealer on this.

Sometimes it revs really high as well. Once in a while (not very often) after I just started it, even if I just hopped out for a second (still warm), and then I put the truck in drive and begin to drive the engine sounds like it wants to fly out of the hood. I'll be honest, I've never looked at the RPM's at this point, so I couldn't tell you if it's a fan, or the actual motor. After 10 - 20 seconds of driving, it sounds normal again. My power is never effected, it just sounds very loud. Does this have anything to do with it idling down at stop lights as well?

[tmleadr03]

Originally Posted by KahneFan

Sometimes it revs really high as well. Once in a while (not very often) after I just started it, even if I just hopped out for a second (still warm), and then I put the truck in drive and begin to drive the engine sounds like it wants to fly out of the hood. I'll be honest, I've never looked at the RPM's at this point, so I couldn't tell you if it's a fan, or the actual motor. After 10 - 20 seconds of driving, it sounds normal again. My power is never effected, it just sounds very loud. Does this have anything to do with it idling down at stop lights as well?

Reving really high sounds like the fan clutch.

Trying to die still sounds like the idle air control to me. Sorry, I am not at work so cant check the TSB on it though.

[dcdoc]

I have too have had the idle drop problem about 3 times, where would the control you talking about be located? and how would you go about cleaning it? also, are TSB covered by GM? even if your vehicle is out of warrenty? I also have the high reving, jet engine sound every now and then but it seems to just happen to me when I first start it up and quits after a few seconds. any recommendations on how to replace the clutch fan? and a good place to get parts?

[rodeo02]

There is no idle air control (IAC) valve on throttle by wire equipped engine like the 4.2L. The TBW system (self) actuates the throttle to maintain idle speed on a cold engine. I'd do a throttle body cleaning if you are experiencing idle issues. The roaring sound on a cold takeoff is the fan clutch. It's fine provided the roaring stops after that first takeoff.

G/luck
Joel

[ScarabEpic22]

Im with Joel, clean the throttle body. It does wonders for symptoms like these plus can help with your mileage too. Takes 30min tops and cost like 4 bucks for brake/MAF cleaner.