383TransAm

I have come in contact with a computer from a 95 Formula and I'm thinking of changing out my OBD 1 to an OBD 2 system.

Can it be done?

What would I have to change?

96flame

95's aren't OBD2 either. And why would you want too do that anyway?

383TransAm

Because I'm sick of havinfg to send out my chip every time I make a change.
It can be quite exspensive to ship that stuff not to mention time.
95's are programable through the PROM port, right?

Injuneer

I guess you have a 93??? Hard to tell, since you didn't include any info in your signature about the year, other than the oblique reference to the "chip".

If you have a 93, you will have a few interface issues. Just for the record, 93-95 are OBD-I, 96/97 are OBD-II. All 94 and newer PCM's are programmable with software.

You will have to add an MAF sensor, or have the 95 PCM programmed to run in speed density. You will have to rewire your injectors, since the 93 uses a batch-fire configuration (individual wire to each bank), and the 94 and newer LT1's are sequential fire (individual wire to each injector). Then the 95 will be looking for the transmission interface, which is only an issue with an A4. With your 93 M6, there is no skip shift solenoid to connect to, so you just leave the harness connector loose and live with the DTC 84 code.

There may be some differences in the wiring pinouts of the ECM/PCM connectors. Either need to get a harness to match the PCM, or start rewiring the connectors.

383TransAm

Thanks Fred!
Yes the car is a 93 and the Computer that I might get has the harnes with it so I'll have to see what happens.

turbo_Z

I believe madwolf did exactly what you are wanting to do. You can try searching for exactly what it takes to make the switch.. if I remember correctly he said it wasnt a lot of fun.