98 motor into 97 body need help

**STEVEGTX** · 10-21-2012

Alright so I got my first supercharged gtp about a year a ago and the wheel well rusted out I found out after I got it hit a bad bump and it shifted but I only paid 500 for it what I know of as mods are 3in downpipe with a catalytic converter to a straight pipe with stock exhaust dual dualtips it has a 3.4 and a different computer the trans went out so I looked on Craigslist and I found a body that the guy blew the piston out the side of the motor and got it for 400 so I had my friend shop put the motor in but I forgot to have them put the wire harness in and I just kept the computer to put in later the only problem was its now a 97 body and a 98 motor and the wiring harnesses have different spacings so I was wondering what I can do to get the computer in should I get a wiring harness for 98 Gtp or is there something I can do to the existing 97's wiring harness to make it work? Please help

**Slick2500** · 10-21-2012

Um you didnt need the computer or the wiring harness, you should have just swapped the engines right over. 97 pcm wont work in a 98 car anyway. And I would not trust a 3.4 pulley on a dp only car just saying. Needs more mods.

**STEVEGTX** · 10-21-2012

I don't know all the mods its how I got the car with all them and I have the 97 harness and computer in the car I want to put the 98 computer on because its an aftermarket one that works with the engine and the mods the kid did before me

**Slick2500** · 10-21-2012

97 pcm will only work in a 97 car 98-02 are all interchangeable with other 98-02 cars. Only thing I can say is see if anyone wants to trade their pcm or just buy a new one from intense or will.

**dsmuts** · 10-21-2012

98 is different than 99-02 the maf tables aren't the same. But you could swap the wiring harness to run the 98 pcm. Should put headers on while your in there.

**acidcrashdburnd** · 10-21-2012

Originally Posted by dsmuts

98 is different than 99-02 the maf tables aren't the same. But you could swap the wiring harness to run the 98 pcm. Should put headers on while your in there.

This X2

**1ATony** · 10-22-2012

Welcome to the site

**STEVEGTX** · 10-22-2012

How much and where can I find a 98 wiring harness for? And the computer I have is a digital horsepower inc calibration version 1.0

**dsmuts** · 10-22-2012

I have a 00 wiring harness i'd let go fairly cheap.

**STEVEGTX** · 10-22-2012

Would it still work and how much?

**dsmuts** · 10-22-2012

I'm not sure but the alternator plug might be different. I'll take a look

**STEVEGTX** · 10-22-2012

Yeah let me know because that would be nice if it would work

**BillBoost37** · 10-23-2012

The differences in wiring from 97 to 98 is something like 10 wires. You could move them in the pcm connector fairly easily. Otherwise..the connectors hook up etc etc.

Or you could use your 97 pcm and since you have DHP, just copy the engine file from the 98 pcm into the 97 pcm. Also quick and simple.

**STEVEGTX** · 10-23-2012

Yeah where could I take it to copy it over because that would work as well

**BillBoost37** · 10-23-2012

You could do it.

**BillBoost37** · 10-23-2012

http://www.grandprixforums.net/pcm-pinouts-46260.html

98 and 99 are identical. Take the 97 and map out the locations versus the 99 and find the differences. Then move the 97's wires to match the 99 pinout. Like I said..there's about 10 to move. If you label them and move..you are all set. It's super easy to move wires in the connectors.

**STEVEGTX** · 10-23-2012

Alright yeah I just don't wanna mess it up but I'm also getting a code up as of the right now saying I might have a short or the computer is bad would it be easy to just get the new harness I do have another 97 I'm parting out I could take that harness if its a short

**BillBoost37** · 10-23-2012

What's the code

You know..by holding this info back you are making it harder to help you? I get very lazy when people draw crap out before posting all the pertinent info.

**STEVEGTX** · 10-23-2012

I think its p1655

Thread: 98 motor into 97 body need help

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