Chip vs. Computer Replacement??

On our 1994 Cobra, it has the J4J1 computer installed with a JMS custom chip. My mechanic and I have determined the computer is bad, not the chip.

I've been looking all over for a J4J1 replacement to no avail. My buddy Roy mentioned yesterday that there's a replacement computer for the J4J1 computer instead of a chip piggybacking on the service port.

Is this true? If so, what are the pros and cons of a chip verses an aftermarket computer?

Hey Joe, how'ya doing these days?

Okay guys..

We had a dead cylinder a couple days ago and in all our testing we got down to the injectors and found "before" preignition, injectors 4 and 6 were on for some reason and maintaining 10v at all times. The rest of the injectors were seen with 3v but not always on such as 4 and 6.

If you look at the ECU wiring diagram, it's the only thing between the injectors and the ECU itself that is or could influence voltage.. that is unless we're clearly mistaken; this is very possible.

The ECU has had a JMS custom chip installed for roughly 4 weeks and when doing testing, we removed the chip and reinstalled the J4J1 by itself and the problem was still present (ruling out the chip theory).

As best as we figure, the ECU must be the culprit. What do you guys think?

:OT: Topic is moving to a new thread.

http://members.pro3i.com/forums/showthread.php?t=482724