"spamtrap1888" wrote in message ...
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.

===

Yes, I've been searching a lot but had so many things out of adjustment it's taken many weekends. This is a great newsgroup because most auto repair sites are mostly for mechanical fixes. Electronics folks can pretty much solve any type of electronics problem regardless of what the application is. This newsgroup and rec.craft.metalworking are always good for helpful folks. Any group that has "computer" in the name is worthless as far as anything inside the cover goes.

Bob