Help: 1995 Chrylser Cirrus: bizaare behavior

This is a follow up on an ongoing troubleshooting project on my daughters car.

1995 Chrysler Cirrus Lx, 2.5L V6, automatic

Recent history:

car starts and stalls intermittently. Sometimes when cold, sometimes when
warmed up. Various codes were set from time to time but not always. Mostly:
TPS, IAT, MAP related.

Procedures so far:

wiggle test many spots in the wiring harness trying to get the problem to occur
and stick. no luck.

End-to end wiring checks on from PCM socket to TPS, IAT, ECT, MAP. IAC, etc.
All good.

Pulled PCM connectors and cleaned female ends, applied small dab of dielectric
grease to each. reassembles.

run voltage tests (cold engine) on IAT, ECT, and MAP. good. Them test again on
warm engine. all within spec.

Current car status:

Ran car for three days. no codes. Still stalls occasionally. However, a new
symptom has surfaced: sit idling in park for 15-20 minutes. The engine will
accelerate to 200-2500 rpm's, drop back down to almost to a stall, then repeat
high rpm's again. It did this several time over a 2 minute person.

Current personal status:

I am going out of my mind trying to track down this problem! The only thing I
can't test effectively is the IAC motor.

Have any of you guys ever experienced this problem before?

Thanks again of the help in the past.

Bill

Today a new crop of codes popped up:

71, 23, 33

Manpower: do I start looking for a PCM?


On Thu, 16 Feb 2006 04:05:19 GMT, Bill <b.TakeThisOut@b.com> wrote:

>This is a follow up on an ongoing troubleshooting project on my daughters car.
>
>1995 Chrysler Cirrus Lx, 2.5L V6, automatic
>
> Recent history:
>
>car starts and stalls intermittently. Sometimes when cold, sometimes when
>warmed up. Various codes were set from time to time but not always. Mostly:
>TPS, IAT, MAP related.
>
> Procedures so far:
>
>wiggle test many spots in the wiring harness trying to get the problem to occur
>and stick. no luck.
>
>End-to end wiring checks on from PCM socket to TPS, IAT, ECT, MAP. IAC, etc.
>All good.
>
>Pulled PCM connectors and cleaned female ends, applied small dab of dielectric
>grease to each. reassembles.
>
>run voltage tests (cold engine) on IAT, ECT, and MAP. good. Them test again on
>warm engine. all within spec.
>
> Current car status:
>
>Ran car for three days. no codes. Still stalls occasionally. However, a new
>symptom has surfaced: sit idling in park for 15-20 minutes. The engine will
>accelerate to 200-2500 rpm's, drop back down to almost to a stall, then repeat
>high rpm's again. It did this several time over a 2 minute person.
>
> Current personal status:
>
>I am going out of my mind trying to track down this problem! The only thing I
>can't test effectively is the IAC motor.
>
>Have any of you guys ever experienced this problem before?
>
>Thanks again of the help in the past.
>
>Bill
>