Hi All!

I I am still troubleshooting and keeping dim hope alive in trying to get my 91 LWB Monty going. Starting a separate thread for this topic so it doesn't get buried in the original gargantuan thread ( Stranded... ).

So...

--Caps can leak electrolytic fluid, dissolve traces, etc.

--ISC coils can short causing excess current to fry the driver card.

--Wire / harness shorts? Anyone have any common culprits?

What else? My original was rebuilt by AV-Pro AFTER my Montero no-spark problem started. The truck has not run since that fateful day. When I got the rebuilt ECU back from AV I plugged it in and it gave the "A-OK" signal at the test connector. That did not fix the no-spark problem. Now after only cranking the ignition sporadically during troubleshooting over the last few months I noticed that the ECU is no longer giving a signal (not even solid "on"--which is the code for dead ecu). Just nothing.

Backup ecu still gives "A-OK" code, but I don't want to risk harming that one until I figure out what happened with the rebuilt one.

I don't have a spare ISC, and the current one tests out fine. I know you can have good test readings and still have a bad ISC, but before I replace it I'd like to explore other possible causes.

Thanks in advance!