2009 Sierra 5.3l, idles up to 3000 rpm after throttle body clean

[swathdiver]

This sounds like an IAC (Idle Air Control) motor problem. On older GM cars this was under the throttle body opening and cleaners could short it out if it wasn't removed for cleaning. A faulty one would make the car behave exactly as you describe. Now, do these truck have an IAC in the throttle body? LOL

Edited September 19, 2017 by swathdiver

[njrorozco214]

I've seen no IAC near the throttle body. I did take it off to clean with tb cleaner and even replaced the throttle body sensor. I've been driving for two days now with nothing hiccups but I still haven't tried revving the engine in park yet

[swathdiver]

Well, since we have drive by wire throttles, there is no IAC, only on the 4.8L. So then, maybe it is one of the two TPS sensors in the throttle body or the TAC, Throttle Actuator Control. I'm new to these engines.

 

 

Do you have the 2008 Silverado General Information pdf? If not and you'd like a copy, send me an email. [email protected]

[Dwriggs]

My rpms is idle at 3000 everytime I start it up I cleaned the now its haywire at times it will go down to 1000 stay under it could it be the tps from moving the butterfly disk? Or a vacuum leak?2007 5.3 chevy tahoe

[Smitty27]

SeaDonk.....what do you recommend on this?    My Sierra is doing the exact same thing.   Disassemble everything and put back together?    Not sure I see a resolution in the thread.   Thanks.

[swathdiver]

1 hour ago, Smitty27 said:

SeaDonk.....what do you recommend on this?    My Sierra is doing the exact same thing.   Disassemble everything and put back together?    Not sure I see a resolution in the thread.   Thanks.

That guy hasn't been around for over nine years.

 

There is a reset procedure done with a Tech-2 or similar bi-directional scan tool.  Otherwise the computer will learn again to idle properly, slowly usually.