So I thought it might be the Throttle positioning sensor. so I picked one up (engine has 84,000 on it). But then I was having trouble setting the Closed Throtle Position Switch on the TPS. In order for the CTPS to be set properly the mixture would be very lean and the engine would race. I could set the CTPS incorectly and the engine would idle properly, but then the CTPS would not serve its function.

This makes me think that my problem is not the TPS in the first place. It must be something else. The O2 Sensor is new. Just checked the IACV, by disconnecting it the idle drops like it should. The check engine light is not comming on, and I went ahead and ran the computer anyway, it did not come up with any codes.

Any of you have simmilar simptoms????????????
Why is the engine racing and running lean(misfiring)?
Has anyone replaced there TPS and not had any trouble setting the CTPS?

 

Turns out it was the Idle Air Control Valve, Well if I followed the manuel corectly in the first place I would have known this. It must be the AAC (auxilary air control) within, b/c the engine was idling at like 1,700rpm (What the engine would normally start at very cold temps). So all I needed to do was run some carb cleaner through the air inlet for the IACV, At first there was no response but then after doing it a second time I was very happy to see the idle drop right back down to the base idle range. So I sprayed it a couple more times to clean any other crud in there. I have to remember to do this on a regular basis, like at every oil change or something.

 

Dude, where is it at, I am lookin at the Chilton's Manual and I can't find it Is it the Throttle body that you are talking about.

 

Dude man I cant tell you what a difference in idle this makes. The IACV is located beneath the throttle body. If you wanna clean it I'll try to describe the easy way (not taking it all apart). If you follow the intake, just after the MAFS you will see another hose on the right of the main intake (it makes a 90 degree turn towards the engine) this smaller black air hose feeds the engines IACV. So all you have to do is disconnect the black hose, spray carb cleaner in the black hose, then loosly reconnect the black hose to the brass fitting, then run the engine. I mentioned to loosly reconnect the hose b/c you will want to repeat this procedure several times (5-7 should be plenty).
If you are not sure what I'm trying to describe then let me know.
You may need to adjust the idle a little afterwards b/c if this is the first time your doing this it will almost definitly raise your idle. Enjoy!!

 

 

 

Of course YOU didn't use the STICKIES to find THIS, which I FOUND in about 10 seconds.
http://www.cybrrpartspro.com/Chilton...61CH04_16.HTML

 

is that a toe ?? hrmm.. maybe its in a jam, toe jam.. get it.. anyways.. so just spray throttle body cleaner in there.

 

You can remove that "can" looking object, thats the IACV solenoid, and clean the piston and spray inside there. But be carful of the little spring. At least one org member lost that spring.


But what I was referring to is the black rubber hose that makes its way to the IACV, I think its right after the MAFS, it exits the main intake and takes a right hand turn, then moves down into the IACV. Spray inside that hose in the direction of the IACV.

Izzy if you cannot figure it out, I'll help you when your out this way! Its only like a 5-10min thing.