Im sure im in a wrong section but I really need some generous advice from some people that have the same idea'* on there cars.

Ok heres the situation I have a 97 Buick Lesabre with the pro series 2 it, has 97,000 miles on it. I got smashed one day not by my fault and settled. I kept the car and bought a 94 park avenue with many many miles on it. It just has the 3800 series 1. Now, the mechanic says we can swap engines if I wanted too for 600. What complications would I be looking at if it did work 6 months down the road? Headaches and alot of problems or is this rather common and should be just fine?
Thank you

Your PCM will be shifting according to the powerband of the Series 1 and the car will be inneficient and under-powered. Not sure what the 'pro' is in the engine description, but it doesn't exist. In addition, the TB and MAF are totally different, further complicating the next item.

The PCM will not know how to fire the L36 injectors and maintain a good AFR.

Your mechanic is not wise. These are two related but totally different engines.


(I'll move your topic to the mechanical sections since this isn't a performance enhancing topic, but purely mechanical in nature).

Waitaminute Wren.


He has a '94 PCM....which is identical to a 1995 PCM....which came with L36 chips. So THAT issue can be dealt with.

BUT....and this a a BIG but....not as big my ex-wifes, but it'* still big.....

The big issue on doing a swap like this will be the wiring. They are quite different between the two engine models, at least fromthe firewall to the engine. Since your 94 uses the same PCM has our 95 Bonnevilles, you may be able to get away with just finding a 1995 engine harness. But to be certain, we will need to verify the pinouts at the firewall connection between your 1994 and the 1995 L36 harness.

maybe i should just take pics of my lesabre and post them. im worried that the frame is bent and its not going to be worth all the effort to fix it. but, I could be wrong. I would love to fix that car if it is possible.

It would help to know more about the drivetrain. Can you get a close-up of your RPO list? It'* on a sticker on the bottom of your spare tire cover. Make sure the VIN matches, though.

Anyway, we need to know whether it had the 4T65E trans. If it does, and you want to do modifications later, it would be better to go ahead and swap the trans as well. Then you have the option of using a 97 PCM that is able to be tuned with software instead of having new chips burned.
It would mean a lot of wiring work, but if the wiring harnesses are intact, then it'* just a matter of getting the necessary harnesses moved over and figuring out if anything has to be modified on the harness itself.