Thanks, Gareth!

"Gareth Magennis" wrote in message ...


"Guv Bob" wrote in message
...
"Gareth Magennis" wrote in message
...


"Guv Bob" wrote in message
m...
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.





Cars aren't really my forte. Is the engine management light on?

Try the youtube route if you haven't already, particularly how to find
vacuum leaks, even though you're sure you don't have one.
http://www.youtube.com/watch?v=d1I_rgw58rI


These ODB readers are really cheap now if you don't already have one:
http://www.youtube.com/watch?v=bbJMHZv7OEA



Sorry if you've done all this already, but you haven't given a lot of data!


Good luck.


Gareth.