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One more thing to try:
Posted by Aaron Gilbert [Email] (more from Aaron Gilbert) on Thu, 28 Dec 2000 21:51:48
In Reply to: rough ridin, bg, Wed, 27 Dec 2000 18:01:35
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I had the same problem on my car, also a '87 9000T. I did three things, that completely solved the problem, and you have checked two of them, so perhaps the third will be the key. I replaced the 'hooter' valve (with the upgraded version, of course), cleaned out the AIC with some 'Air Intake Cleaner' I think it was called (basically Carb cleaner, but specified as safe for fuel injected vehicles as well), and also cleanned out the throttle butterfly with same cleaner. Now the AIC I had done before, and also had replaced the hooter once before, but this was the first time I cleaned out the throttle body. Just take off the big air intake hose, spray the cleaner in, then as you move the throttle (causing the butterfly valve to move), spray more cleaner in. I pretty much soaked the inside of the throttle body with this stuff. Then wipe it out with a clean lint free rag, I got quite a bit of black gunk out of there.
After that, my throttle needed to be slightly adjusted to provide the correct idle, but the dropping rpm/near stall was totally gone. Now if I put the clutch in, rpms just drop slowly to the proper idle speed.
Worth a shot, looks like you have checked or changed everything else! Another thing I've heard of that might cause a similar problem is the 'decel dashpot'. I believe it has something to do with how fast the rpms drop when you put the clutch in. I could find only minor reference to it in the Haynes manual, so frankly I don't know where it is...has not been replaced in my car yet though.
Good luck!
Aaron Gilbert
1987 9000T 249k miles
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