On Jun 2, 11:28*pm, "Guv Bob"
wrote:
"Gareth Magennis" wrote in ...

"Guv Bob" wrote in message
om...
My 1990 Mitsubishi Eclipse (DSM 1G 2L non-turbo) is starts and idles cold
fine, and runs fine warmed up. *When warm and I put it in neutral (AT) the
idle oscillates between 1800 and 2200 with about 1/2 second cycle time.

MAS was the first guess -- so I put a rebuilt mass airflow sensor assy in
and same problem. *Checked all the connections and vacuum - all OK.

Also took the throttle assy apart and cleaned all - helped the running but
still oscillating. * Cleaned Idle air motor, checked voltages and
resistance for all sensors and also voltages coming from the computer, and
all OK.

About out of ideas -- anyone have some thoughts on how to start
troubleshooting this?

Thanks in advance.

Bob

Have you looked for an air leak (using carb cleaner or blowtorch gas)?

I suggest you try a car repair group though, this isn't one.

Gareth.

Thanks Gareth. *Yes, checked already. *Vacuum, electrical connections, mechanical etc., all seem to be OK. * It's definitely in the electronics. *Car groups are good *but gotten better help with auto electronics from these elec groups.

Try to find a Mitsubishi online forum. If I have trouble with my Golf,
I go to vwvortex.com . Ninety percent of the time, someone else has
had my problem and solved it, with a step-by-step DIY posted, along
with pics.