Mass Air Flow Sensor Assy for 1990 Plymouth Laser

"Daniel who wants to know" > wrote in message ...
> "Guv Bob" > wrote in message
> ...
> >
> >
> > O2 sensor checked out fine. Will keep looking for the cause of problem as
> > I have time. I noticed a new problem that might be related? When I
> > turn the ignition to ON (but not cranking) there is a chattering solenoid
> > noise coming from between the
> > center of the firewall and the engine. Normally I can find noises by
> > listening thru a tube as I move it around, but this time can't find it.
> > It's not the starter solenoid. Any ideas where any other solenoids are
> > near the top of the firewall area?
>
>
> It's a long shot but the Mitsubishi computers in Suzuki Sidekicks/Geo
> Trackers had problems with bad capacitors leaking and eating the PCB traces,
> Mitsubishi made the EFI system used by Suzuki. One of the symptoms was poor
> running and chattering relays followed by a completely dead computer, hence
> no-start. I would check them in yours if it has a Mitsubishi computer
> instead of Chrysler, which is likely since Chrysler didn't use MAF very
> often, they almost exclusively used a speed-density system on the cars.

Thanks Daniel. Will check the computer this weekend. Went thru all the sensors, wiring, connectors, vacuum, fuel injectors and associated circuits and all OK so far -- I did find the chattering - it was the idle speed air valve stepper motor. Cleaned it and banged on it a few times to loosing the crud and no more chatter and tested OK.

Will try to check what's left and if no luck, I'll be looking at a car donation or something like that. Fairly new head & rebuilt trans - hate to see it go for something I can't pinpoint.