So my dumb ass had the bright idea to polish my plenum and throttle body. They both had a TON of oil, carbon and other chit in them from 100K+ miles. So I got it all cleaned up and done, carbon removed and everything clean.... Now the chitty part.....
My rpms don't drop while under a load. The car idles fine (oddly enough with or with the iac plugged in, so I think thats my issue). I can blip the throttle while in the garage and it goes up and down just like its supposed to. Idles 750 or so. Perfect right? I thought so. But when I take it out for a spin its goes crazy. As soon as you put a load to it the rpms stay for at least 15-20 seconds. If I shift at 3500, they stay there till I either engage the next gear or wait long enough for them to come back down. But like I said, this only happnes under a load. The throttle is not sticking, no vac leaks, I replaced gaskets..... I'm lost.
I am going to try another iac tomorrow but if that doesn't fix it I am f-ed.
Anyone have anyother suggestions. I can say that I cleaned a TON of carbon build up on the tb and a chit ton of oil build up out of the plenum. That being said there is no "loose" junk to get anything stuck. The throttle blade works flawlessly, linkage is all good. No reason it should be doing this now as it worked just fine before.
I have read may threads on this and can't find a definitive answer... I read where others have made a restrictor plate (see here http://forums.stangnet.com/541046-fix-your-slow-dropping-hanging-rpms.html) but that was for 1500 or so hanging rpms, with that work it mine is haning up so high?
My only real guess is that the iac is weak and hanging open or opening too far once the blade snaps shut. Since it is only activated when the tps reads its "low" volt setting I am assuming that the load/air needs of the engine are making the iac let much more air in that is needed. Does this sound logical?
Oh and its late and I am not proof reading this ******......
My rpms don't drop while under a load. The car idles fine (oddly enough with or with the iac plugged in, so I think thats my issue). I can blip the throttle while in the garage and it goes up and down just like its supposed to. Idles 750 or so. Perfect right? I thought so. But when I take it out for a spin its goes crazy. As soon as you put a load to it the rpms stay for at least 15-20 seconds. If I shift at 3500, they stay there till I either engage the next gear or wait long enough for them to come back down. But like I said, this only happnes under a load. The throttle is not sticking, no vac leaks, I replaced gaskets..... I'm lost.
I am going to try another iac tomorrow but if that doesn't fix it I am f-ed.
Anyone have anyother suggestions. I can say that I cleaned a TON of carbon build up on the tb and a chit ton of oil build up out of the plenum. That being said there is no "loose" junk to get anything stuck. The throttle blade works flawlessly, linkage is all good. No reason it should be doing this now as it worked just fine before.
I have read may threads on this and can't find a definitive answer... I read where others have made a restrictor plate (see here http://forums.stangnet.com/541046-fix-your-slow-dropping-hanging-rpms.html) but that was for 1500 or so hanging rpms, with that work it mine is haning up so high?
My only real guess is that the iac is weak and hanging open or opening too far once the blade snaps shut. Since it is only activated when the tps reads its "low" volt setting I am assuming that the load/air needs of the engine are making the iac let much more air in that is needed. Does this sound logical?
Oh and its late and I am not proof reading this ******......