1994-1995 OBD1.5 Reflashing...

[19Cutlass94]

If they could find a way to crack it I would more than likely pay to try out one of their PCM's

[IsaacHayes]

Ok I fired off a couple emails to people who have access to our PCM's. The problem is they just do not have all the stuff mapped out so they don't know where the tables are. Example fastchip can remove the rev limiter and change shift points but can't access fuel tables. They can reflash with this info and send you a new PCM. They use tunercat.

Anyway, hopefully something can come of this, we just need someone who can take a crack at decoding the stuff. The tools to read the bin and upload a new one are already out there.

[IsaacHayes]

I would think they would be able to pull the bin and flash the ECM, it's just modifying their software to support the V6 parameters is what I think they might not like. I'm sure they could decode the bin or someone could.

[95 V6 J body]

Yeah, I was planning on emailing them or giving them a call as well. Maybe if enough people do so because of your thread, they might think about doing something.

[IsaacHayes]

I'll see about emailing them tomorrow.

[95 V6 J body]

Well I had pretty much resigned myself to the fact that I was going to have to change ECM and wiring, but stumbling upon this thread sparked a little hope.

Needless to say, if 1.5 code gets cracked, I'd be pretty psyched.

As far as the F-body and N-body ECMs using the same pinout, I've had my hands on the N-body schematic, and I'm pretty damn sure they're the same. I'm going to track down a service manual for the Grand Am now and compare the pinouts side by side. With luck, even if I have to change some wires, there won't be a ton of them.

[IsaacHayes]

If you reflash it, then the outputs will change... so you'll have to change some wires... is what I mean. Meaning you cant just swap say a fbody flashed ECM into my car and have everything run fine minus 1 o2 sensor.... if it does that would be very lucky lol

Ah yes the 3.1 did use distributor. So you'd need a 7730, with $A1 code and wiring harness. The $a1 is like beretta/cavilier 3.1mpfi w/DIS and aluminum heads. Basically you are at a dead end with the ECU you have unless carputing can decode the bin. You need to go obd1 or obdII... Not sure which is the easier route with your harness...

I need to email them. Once I get my cable I might try pulling the bin via their software or tunercat. Then send it off to someone to decode..

[95 V6 J body]

well regarding the reflashing for the 94-95 3100, the pinout is actually the same, it's the same ECM. The only difference is that the F-body has an O2 sensor for each bank, but the 3100 only has one. Everything else is the same.

As far as the 93 F-body, I believe that used a 7730, but also didn't that engine (the 3.1) use a distributor still? I thought the 94 was the first RWD V6 that went with the DIS. I could be wrong.

[IsaacHayes]

If you get it re flashed you'll still have to deal with the pinouts or a new harness... OBD1.5 3100 code won't throw any SES lights for lack of auto transmission but you will have a big of a surging idle when slowing to a stop.

Best to downgrade to OBD1 and get a chip burner or emulator, or upgrade to OBDII and get the HPT/DHP.

I wonder how different the pinout is on say a 93 F-body ECM to the 94 ECM?? That might be the ticket. Then edit the tables to stuff that more closely matches the aluminum head engines.

[95 V6 J body]

Actually, it runs fairly good, but it is running a little rich. I'm assuming it's mostly because of the displacement difference, but when I was doing the swap, I had planned on using HPT to tune it anyway, but I didn't realize it wasn't OBD 1, but the OBD 1.5.

I'm thinking of taking it down to NAPA and having them flash it with the 95 Grand Am 3100 tuning and seeing what happens, but then I'll have to send it out to get the auto trans settings removed, so I'm not sure what I'm going to do. That's why this thread caught my attention.

[IsaacHayes]

Running a 3100 on the iron head Fbody ECM? Wow. Those iron heads have a ton of spark advance... how does it run?

[95 V6 J body]

Hmmm...I would be very interested in this. I just finished wiring an engine swap using the 94-95 F-body 3.4 ECM, and found out that there was no tuning support for it like the day after I fired up the engine. I've been considering changing ECM's, which would, of course, require repinning connectors, or replacing the harness. If I could tune the setup I've got, I would be very happy.

[IsaacHayes]

This is the ECM correct? 16196387
These guys have cracked the LT1 94-95 OBDI flashed based ECMs. http://www.carputing.com/

Anyone thinking what I'm thinking? Maybe they can create something for us? $200 is what they charge to give you the software and you use an ALDL cable and re-flash it like you do with OBDI.