sm6989

Alright, Just recently(few weeks ago) my idle has been high(1500-2000) every time I come to a stop, But will drop down to 800 after I sit at a light or so for about 15-20 seconds..

Any ideas what the problem could be? Just kinda started happening out of the blue it seemed. Someone told me it could be the coolant temp control?

PRO50SC

I would start by cleaning the IAC motor.

sm6989

Already been cleaned.

Joel5.0

KOEO/KOER self-tests , check what the ECM is working with first.

scbmx87

Try your throttle position sensor...right on top of where your throttle body connects to ur intake. Its only a few bucks to replace.

sm6989

$35 new to replace, not bad. Anyway to acutally tell how its bad? I think my friend was messing with it the other day, could him changing the position cause it to idle like that?

mattdel

possibly. got a volt meter? check the green wire on the TPS. key on/engine off, should read 0.95-0.98v

sm6989

Indeed I do, I'll check it out in the morning

sm6989

I'm getting 0.74v, so I take it its bad?

Joel5.0

Nope...it's fine....as long as the TPS voltage is between .5 vdc and 1.1 vdc (.8 - 1.0 vdc = optimum) it's OK. Anything below or above those values will cause a TPS failure code. The .9999 vdc setting is a myth, the computer will set the minimum voltage read as "0" for its ratcheting logic. Run the self-tests, and check if you have a code 67 and/or 29 showing up at KOEO and codes 12 or 13 in the KOER self-test. Suggest to not guess....it could become unnecessarily expensive (= buying unneeded parts)......just a thought.