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surging idle mysterious stall????92 cav
92 cav 2.2L MPFI
There is a lot here but i'll try to keep it short.
Bought car and it had a high idle. Then after 2 or 3 mo it started stalling. Had a head gasket put in ( it was leaking). This stall had gotten worse and it would only do it at low speeds at certain places. So it was checked by a mechanic and it was determined that it needed a new computer, (same one who did gasket) he could never get it to stall for him. 3 computers were put in (all from "junk yards" and none fixed the problem (idle). He wants to try a new one $$?? He was doing the "tap test" to the computers and the engine would stumble and stall.this is why he want's to try a new one I sorta think there are 2 problems here. I replaced the IAC as well as checked the CTS, TPS, ATS all seem ok. After I put the new IAC in and did a idle relearn this is when it started surging. But before the car would just stay at high idle, now it will come down to normal but go back up.So I drove the car to work and found that the car will accelerate on its own to 40 m/hr. It did stall on me though at a low speed in the morning. but fired back up. When it was originally stalling before new IAC I was getting good spark on all plugs. I put in a new fuel filter. I"VE CHECK EVERYWHERE BUT NO SIGN OF VACUUM LEAKS??. I havn't checked CPS. I unplugged the TCC solenoid and it still stalled. I started to check the MAP I got a 5V ref with key on then when I started it no drop in volts???
I get a MAP Code 33
I had a 42 EST but didn't come back
and a 66 air cond pressure
I need some direction.
Thanks
gunner
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