Thread: New Updates! After swapping 98 gp gtp 3.8 s.c. into a 2002 gp se car

We put a non magsteer rack in my buddies 00 gp gt, his abs works w/o it

Anyway thanks for the help so far, im done far the night. I wont be back on till later in the week.

So you didnt have security issue with swapping pcm?

No security issues, but im missing the remotes (keyfobs).

Originally Posted by BillBoost37

Do you have the schematics on both engine wire harnesses where they connect into the relay center? That's likely most of the problem. 3.1 probably put a pin in a different place.

Also...if you put an HD diff into a non hd w body trans, the gear ratio is going to be 3.29 instead of 2.93. That might piss off the pcm and cause cruise and abs to not work.

So if i put the std diff back in the pcm will not throw the code for incorrect gear ratio, otherwise i would need to swap the gears a chain behind the valve body?
Also not having any luck finding schematics for between relay center and firewall.

Anyone know or have info on re-pinning wires on the three plugs that bolt on underneath the fuse /relay center?
I found the stumbling problem which was a loose hose between fuel pump and sending unit.
The engine runs great other than the temp gauge not moving off of 0, the low coolant light comes on as the service engine soon light, low oil level light comes on in reverse-third and first, the range selector indicator does not work at all, and fan 1 does not come at all. Any help or info or where to look would be great its been aggravating not finding any info about this.

I'm not getting any responses about my engine harness / fuse relay center questions to fix the dash cluster warning lights and gear selector lights not working right yet. To early for responses or would picks of items in question help get better responses. I really cant believe that no one hear hasn't swapped out a 2002 SE LG8 for a 98 L67 besides having both complete cars.

Theres a guy on w-body.com that could help ya out. Hes my go to on wire/pcm i fo. Robertlssar.

Thanx I will give it a try!

Just had a thought and cant remember if you said, but did gou use the gtp bcm also?

No i did not, did not even think about it
could this be some of my issues_ what does it control

On your car some of the gauges tcs abs tcc i believe

I totally forgot about that! I will try that tomorrow
what about the ebcm - electronic brake control module it thought i saw somewhere that if you replace it you have to reprogram it for the car. so should i swap that out also?

By the way l67ss i like your quote. Any idiot can build a fast v8, it takes a REAL idiot to build a fast v6

Saw that on a third gen f body forum and laughed my ass off so i stole it

Not sure on brake controller, if you have to seap it just swap in thr gtps ignitjon. That eay all modules or vins would match and no program involved

I have a little update- i found a 2002 GP GT 3.8 engine harness at a pull yard for $9.00, gonna see if its in good shape and pick up on monday.
Dont know where to send the pcm to get it programmed yet, but still looking.
I replaced the fuel line between the fuel pump and sending unit, it had two bubbles in the line and super squishy and collapsed in two spots.
now the codes p0134, p0171, p1133 cleared and did not come back. Getting a little closer.

Its like aa, i step at a time Mebbe milzymotorsports?

Hey milzy motorsports got good reps
I dont think you can beat $99.00 unless you have your own programmer.
Nice find thanx

If you go that route, let me know how good the tune is, im about to need a custom tune. Yeah i dont remember hearing any bad on milzys

Originally Posted by JimSWylie

Hey milzy motorsports got good reps
I dont think you can beat $99.00 unless you have your own programmer.
Nice find thanx