PCM swap

Asked by Mar 07, 2016 at 10:36 PM about the 1997 Chevrolet Lumina 4 Dr LS Sedan

Question type: Maintenance & Repair

I just swapped my pcm on my 97 lumina 3100 with
a pcm from a 97 Buick le sabre. Is there a way to
make this work without reprogramming or
flashing? I'd rather not have to get it towed to the
shop and spend $120 for them to flash it.
Swapping the pcm fixed all my problems except
for the fact it will not start but will turn over and I
have spark,fuel, and air flowing. Seems the pcm is
not allowing my injectors to pulse.

5 Answers

72,265

Verify that the injectors do not pule, check with a test light.

Verified no pulse

72,265

Ok, you have something with the security system being activated. When the security is activated, it shuts down the injectors. I suspect changing the pcm it is not recognizing the chip that is in the key, or something. Unfortunately I do not know much about security system, just that I know it is activated. If you have that other car you could try and take out the key lock & cylinder and install into your car. I would investigate this further.

The security light shuts off after a few seconds and the passkey has been bypassed for remote access by the previous owner. Before I swapped the pcm I wasn't getting any power to my fuel pump and the computer wouldn't link up to obd scanners. Now I have power to fuel pump and can connect with my scan tool and the service engine light is on but there are no codes.

72,265

Honestly, I don't know anymore than what I have told you. The guy who knows security systems & more on pcm swaps has not ben on lately. js08016 is his handle, maybe try and find his garage and shoot him an e-mail. Sorry.

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