CamaroTrish

hope someone on here can give me a little bit more info or get me in touch with someone who knows more about lt1's.


i have a 1996 trans am that has a lt1 from a 1995 camaro in it...i bought it off someone and they didnt have too much info to give me except that it was a rebuilt motor out of a 1995 camaro.

the problem: the car is throwing codes for the o2 sensors, crankshaft position sensors and the MIL not working. the car runs and drives so i know there isnt a problem with the crankshaft sensors. i belive its a problem with the computers in the car. i spoke to a couple of people and they told reflashing the computers will not fix these problems. would trading computers from a 95 camaro work? would they work in a 96 trans am?

any help or suggestions would be greatly appreciated...thanks!

BlackScreaminMachine

iTrader: (17)

You have a ODBII pcm running a ODBI Engine. Now 1995 was the 1st year of the Vented opti spark, I dont recall if they got position sensors on the timing cover that year, or if they went on for 1996.

It doesnt matter as far as Camaros or T/A's

As for PCM's LT1's had 3 major Changes

1993- ODBI No MAF a "chipable" pcm
1994-1995 ODBI MAF Unvented Opti (94) Vented (95), Flashable PCM
1996-1997 ODB2 Vented opti and new pcm.

I dont have much exp with ODBII parameters but the harness for the PCM is going to be different and some of its not going to match up to the engine, thats prob why your having the issue. If the car isnt physically running bad, then dont worry. Or swap a 94/95 Harness in there, then it matches up to the motor.

Edit:

Good site to check out if you havent already

http://www.camaroz28.com

I'll see what I can dig up in the mean time.

BlackScreaminMachine

iTrader: (17)

ahhh here is a good link

http://web.camaross.com/forums/showt...light=1994+pcm

PM Madwolf he is a big LT1 email tuner, he knows his ****. He would have better insight then me.

CamaroTrish

thanks for the input...just a little while ago it clicked about the whole obd1 and obd2 thing..ill definitly check out those sites.

the problem is getting it to pass emissions...ill let you know

Mikey 97Z M6

iTrader: (37)

I believe the 96-97's have an extra crank sensor located on the timing cover.

You should first try to find out if they swapped the engine harness with the engine swap, or if it was just a straight engine swap. Look for an extra connector around the front of the engine that isn't plugged into anything.

I suspect one of two possibilities,

1. They just swapped the engine, kept the OBDII harness/pcm, and without that newer cover/sensor, they had no place to plug it into.

2. They kept the original OBDI engine harness with the engine that went into your chassis, and just used the OBDII pcm. The pcm is still looking for that sensor but the OBDI harness has no provisions for it.

Either way, you can resolve your code problem by swapping in a 94-95 pcm (it's a straight plug/play affair).

I did an OBDI conversion on my 97' way back before LT1_Edit had OBDII capabilities. I think the knock sensor needs to match the year of the pcm if memory serves.

Good luck.

Mike

CamaroTrish

thanks mike...but would a 94 pcm work considering they didnt use opti-spark in 94? and im going to go look for connectors not pluged in but i am almost positive that the retard just swapped the motor and plugged it in. i called him and asked and he said to ask a mechanic!! my fault for buyin a car from a total dumbass.

either way i am going to be looking for a pcm out of a 95 camaro/firebird or 94 but i dont think it would work...so if anybody knows of one please let me know. thanks so much!

BlackScreaminMachine

iTrader: (17)

An opti spark was used in all years of LT1's from 1992-1997. Its prob that you have a 96 pcm and harness hooked to a 95 motor and since some connectors are not hooked, thats why you have the light

lastcall190

iTrader: (36)

AFAIK, 95 motor in a 96 car... 95 had single cat, no downstream sensors as far as I can remember. 96 was dual cat, 4 sensors. That MIGHT be the 02 sensor issue... madwolf is good, he did my LT1 back when I had it with a mail order tune.

CamaroTrish

good to know...thanks. and i sent madwolf an e-mail and im waiting to hear back

CamaroTrish

thanks so much...just going to get the computer re-tuned....

BlackScreaminMachine

iTrader: (17)

awesome! let us know how it works out.

Mattsz28

iTrader: (1)

This man speaks the truth. No downstream (IE rear) 02's. I had PCMforless do my tune. Good guys if you ask me. She runs like a raped ape.

CamaroTrish

will do...