PCM problems, GT to GTP

**saleenprix** · 11-17-2010

The car is finished, all i need now is a PCM.
I bought one off a GTP and put in it my car and the fuel pump will not prime.
I put my old PCM (GT) back in, the fuel pump works fine.
It obviously isnt my fuel pump. Is there a difference in the pins on the PCM?
This has been tested on 2 different pcms.

Im so LOST

**matt5112** · 11-17-2010

you need a combination of the two PCM's else your car wont run.

do NOT drive it with the GTP pcm because your tranny tables will be very off.

unless you swapped transmissions as well.

What year is your car and what year is the GTP PCM that you have?

**saleenprix** · 11-17-2010

Originally Posted by matt5112

you need a combination of the two PCM's else your car wont run.

do NOT drive it with the GTP pcm because your tranny tables will be very off.

unless you swapped transmissions as well.

What year is your car and what year is the GTP PCM that you have?

Car is a 98 and the pcm is a 98 too as far as i know.

**blueguy** · 11-17-2010

I've heard you need to start with the GTP bin file and change stuff around...at least that is how it worked on Gafford's car...

**saleenprix** · 11-17-2010

Originally Posted by bluegtp91

I've heard you need to start with the GTP bin file and change stuff around...at least that is how it worked on Gafford's car...

im getting a friend over in a few hours, im going to try his PCM and if it doesnt work then, i know its a problem with my car.

**blueguy** · 11-17-2010

Aren't they fun?

I love W-Body's.

**saleenprix** · 11-17-2010

seems like i ended up with a PCM from a pre 98 car. its the huge bulky looking one. the one from the GT is flat looking. will anything post 98 work?

**TheOtherNick** · 11-17-2010

Sticking with the same year would be best, but 98-02 should work.

**99prixgt** · 11-17-2010

sounds like you got a 97 pcm. The pin outs are different.

97 pcms are 1 year only

**saleenprix** · 11-18-2010

Originally Posted by 99prixgt

sounds like you got a 97 pcm. The pin outs are different.

97 pcms are 1 year only

Yep i ran the Service # and it is a 97

gotta find a 98.........

**01gpgt01** · 11-18-2010

what trans did you use? Id just use the GT pcm and load in gtp bins

**blueguy** · 11-18-2010

Easier to do that on an SSM90 kit...there are problems run into using a GT PCM, such as not having parameters in the PCM for boost...or so I've heard...but I don't know...I don't tune.

**Spartan GL** · 11-18-2010

Originally Posted by saleenprix

Yep i ran the Service # and it is a 97

gotta find a 98.........

I have a 98 PCM for sale! works fine was the stock PCM i was using in my car before i ordered a Tuned one for my 3.4 setup

**01gpgt01** · 11-18-2010

Originally Posted by bluegtp91

Easier to do that on an SSM90 kit...there are problems run into using a GT PCM, such as not having parameters in the PCM for boost...or so I've heard...but I don't know...I don't tune.

Nah you can load it in for a l67 map. No issues I can see. might have to unhook the BBV and just let it operate with vacuum. Thats about it. I run a l32 map in mine FWIW