96 PCM in 94
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Joined: Apr 2002
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From: East Stroudsburg PA
96 PCM in 94
I just picked up a 94 auto to put my 96's LT4 and manual in. The engine harness in the 94 is very brittle and old looking. Is it possible to use the 96's computer and engine harness in the 94?
Safety Car
Joined: Apr 2003
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From: VA
OTOH, the other one will be brittle soon if it's not already, so it may not be worth the effort. GM uses crap wire.
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
From your other thread (it helps people to help you if you don't start multiple threads on the same topic...):
Just get the 94 computer programmed. The LT4 stock programming is really half assed, so get it tuned regardless of which computer you use.
Disable EGR codes in tune.
No.
No.
Yes
Just use an M6 tune.
Just get a mail-order tune for the 94 PCM for an LT4 with M6. ~$100.
I have a totaled 96 LT4. The engine runs and the 6 speed is good.
I have an opportunity to pick up a 94/LT1/Auto.
I'm not worried about the mechanics of swapping the drivetrain - I have the complete donor car. I'm worried about the electronics.
Can the 96 computer be swapped over so I don't have to reprogram? I have the full engine harness if so.
If not, what happens with the following:
1. No EGR on LT4
2. Is the speed sendor the same for manual?
3. Will I break traction control?
4. Can I swap the 8K tach from the 96?
5. Can the ECM be reprogrammed to not throw trans codes?
Are there any obvious questions I'm not asking?
Thanks,
Peter
I have an opportunity to pick up a 94/LT1/Auto.
I'm not worried about the mechanics of swapping the drivetrain - I have the complete donor car. I'm worried about the electronics.
Can the 96 computer be swapped over so I don't have to reprogram? I have the full engine harness if so.
If not, what happens with the following:
1. No EGR on LT4
2. Is the speed sendor the same for manual?
3. Will I break traction control?
4. Can I swap the 8K tach from the 96?
5. Can the ECM be reprogrammed to not throw trans codes?
Are there any obvious questions I'm not asking?
Thanks,
Peter
1. No EGR on LT4
2. Is the speed sendor the same for manual?
3. Will I break traction control?
4. Can I swap the 8K tach from the 96?
5. Can the ECM be reprogrammed to not throw trans codes?
Just get a mail-order tune for the 94 PCM for an LT4 with M6. ~$100.
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Joined: Apr 2002
Posts: 93
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From: East Stroudsburg PA
Thanks for the tips.
I really appreciate it. Do the 94 and 96 PCM's have the same pinout? In other words, can I just use the newer wiring harness? What's a long term solution to the decaying wiring?
Thanks again.
Thanks again.
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
The other harness differences you need to consider are:
optispark harness - use the opti harness off the 96
coil/ICM - use coil/ICM same year as harness
Knock sensors - use knock sensors same year as PCM
My own solution to the wiring is that I've just spliced in new wires as needed. Some of the connectors are starting to fall apart too. Keep your extra harness for spare connectors!
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Joined: Apr 2002
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From: East Stroudsburg PA
Thanks again
for the reply. I was hoping I could keep the 96 computer and wiring harness. I guess I'll just have to disable codes for OBDII stuff the 94 doesn't have?
I'm going to put the Hot Cam in the LT4 before installing it. I'm going to search the forum for a recommendation on a good tune.
I'm going to put the Hot Cam in the LT4 before installing it. I'm going to search the forum for a recommendation on a good tune.
