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i have a 2007 GMC yukon with 5.3 v8, had dtc P0121 for TPS performance, was told to clean out throttle body, so I did, after putting everything back together, this things idles at 2200 rpm and will not come down, tried disconecting the battery for 10 minutes, did the drive learn, but still no change, was told that I had to take it to the dealership for a throttle relearn that can only be done with there scanner, anyone ahd this problem that could guide me in the right direction?
Sounds like you have a severe vacuum leak somewhere.
Throttle relearn? sounds bogus to me, is the blade maybe stuck from closing more after the cleaning?
+1.Quote:
Originally Posted by RedHeartbeat
Its a GMT900 truck is presume? Is there a hose coming from the pass. side valve cover that goes into the TB?
Did you completely disconnect and remove the TB prior to cleaning?
I got it fixed, they performed the throttle relearn procedure at the GM dealership, this is a NNBS yukon and it isnt like the previous models, I used to fix idle problems on the previous style LS motors by cleaning out the throttle body, performing the capacitive discharge method touching both leads off the battery after discontecting them and then letting it idle about 10 minutes, but it didnt work this time, also this truck uses a Different PCM, not like the older 99-06 models, so if you know of anyone having this problem, you can let them know what worked in my case, once again thanks for you replies.
Cool. Glad you got it figured out. :thumb: