How come there is no custom PCM available for a 96 Bonneville? Actually...ANY GM vehicle in 96.? I've searched the forum and can't really find any reason why.



James

Because 96'* still have the 4t60, even though it'* a S2 engine. Most tuners (or any that I know of?) only support the 3800 S2 with the 4t65. So therefore most companies don't offer a PCM for that combo. I know, I'm right there with you man (96 Ei).

What many people have done is just swap in a 4t65 and a 97+ PCM, that'* what I'm going to do when my 4t60 goes.

if that is true then my 97 SE has a 4t65e trans...cuz as the casing clearly states that it is a 4t60e?

James

Hmm, maybe the SE'* still had that trans in 97... I know the Ei'* didn't. Sorry, not sure

I've got a 4t60 and have an INTENSE PCM.

So do I in my 97....but my cousin has a 96 monte carlo and wants to put a motor i have in it (96 3800) but we can't find a 96 custom PCM. And he can't get one for his stock 96 3100 engine either..there are no listings for any custom 96 GM PCM, i've looked everywhere


I do belive it has something to do with the trans though..i'd just like to know if any one has a definite answer. and yes Zuper your are right...97 SSEi got the 4t65E while SE and other non-supercharged got the 4t60e.

James

I gots anserz.

In my research for the OBD2 conversion, what I found is this: the 1996 and 1997 PCMs are IDENTICAL. Same PN, connectors, same dimensions. What is DIFFERENT between them is the OS. What few people realize is that the OS determines pinouts for the PCM/engine combo. The pinouts differ slightly between L36 and L67 engines by themselves, and differ more between -60e and- 65e transmissions.

Since you have an SE, I am certain you can run a 97 PCM with no issues at all. 1997 L36s were the last ones to use the -60e. (Which, btw...I have in my spare parts warehouse...and I can flash in a new tune and kill the VATS).

so technically we could put the 96 3800 in the 96 monte carlo, and have it flashed for a 97 and his final drive gearing 3.33, and be done with it?



Thanks dude


James

Yup. However, VATS will have to be turned off via programing. And you WILL need a 1997 PCM for core exchange. Though I said the 96 and 97 PCMs are identical, the OS the 96 PCM will have will not allow INTENSE to do a write-entire on it.

Rachael, I was in the process of testing out the '97 L67 file when my engine crapped out, and it was able to control the -60e fairly well. Last thing for me to check was the TCC lockup, which I had issues with...but I think it was more TPS related than anything. This would allow you to run a custom PCM and still have the -60e.