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Forgot to mention this car has no TCS, so not electronic throttle body, but I think that isn't too far off from the issue.
I got home and got to work trying to diagnose this thing.
First off, the IAC I found at the junkyard was not the right style as it came out of an older 9000, the wiring connections were not correct.
I pulled the enblow from the intercooler pipe to the throttle body and inspected the throttle plate, looks ok, not gunky just a light coating of oil, which I expect. I spray it with some carb cleaner anyway opening and closign the throttle as I spray.
I then tried starting the car. It fired up and sat at a regular idle, I let it idle for about 2 minutes, no problem at all. I blip the throttle and it goes back to the routine. Between 1000 and 2000 rpm rev, fall rev and fall. That continues, I try revving it up and letting off, revving it up and holding it, nothing seems to fix the problem. I went under the hood, wiggled connections to the throttle position sensor and other things without success. I unhooked the TPS and the engine seemed to go up to maybe 3000 rpm and hold itself there. I thought that was odd, but I have no idea what it should do when you unhook the TPS.
So I shut it down and pulled the IAC valve off, that also has some oil in it, but the thing that bothers me most is that when I look in there at the piston that rotates to allow more air in it looks like it's scraped (from twisting for 210K miles no doubt). I spray a healthy dose of carb cleaner in, let it sit then reinstalled it. I fire it up again, again it idles fine initally (succes I thought) but alas it was not to be. As soon as I pull the throttle cable I hear the IAC valve go wide open and it just stayed there. This was very odd because while idling it was very quiet, but then it got quite loud and did not change regardless of what I did to the throttle.
I wanted to be sure the sound I was hearing was the IAC so I plugged it's hole in the throttle body and sure enough the sound went away (and the engine nearly choked to stalling) When I removed my finger the car was idling normally again.
Now I'm really stumped. I'm assuming it's either the TPS sensor or the IAC valve (leaning toward the valve because of the weird grinding style marks).
It seems to me that it has to be something involved with either telling the ecu I'm at idle or keeping the car at idle.
what do you all think?
Matt
94 aero
posted by 66.67.11...
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