SunCr

Lizardlver15: a 41 means the Prom is toast. A 41 has nothing to do with anything else. Whomever told you it needed a new EST may have thought you meant a Code 42 (or if that is what you're getting, start a new post). I don't know of a source for a new Prom but someone around here can probably reference a site so that you can get the number and then one of the Vette wrecking yards should be able to fix you up.

3D-Aircrew

Looking for a prom too ... probably going to have to go with HYPERTECH.

3D-Aircrew

Apparently Chevy don't stock them any more. I need the stock prom for a later 86 automatic (AL Heads)
Thanks

3D-Aircrew

3D-Aircrew

Find GM Parts online and order direct

http://www.gmpartcatalog.com/

3D-Aircrew

Although I was able to initiate the order online ... today it was cancelled because the PROMs have been discontinued.

It really is looking like I'm going to have to go with an aftermarket PROM.

floridamale

I would call some of the tuners on here see if they can help, you might find a used one try Arts Corvette do a google for them ask for Mike
Not sure but you might find something here also
http://www.autocomputerexchange.com/
Good Luck on your search

3D-Aircrew

Thanks Floridamale;

It looks like they have some PROMS for an 86 in stock ... I need to get the AANK.

3D-Aircrew

Does anyone know of other parts houses to try?

I've tried ARTS corvette Parts, C&S corvettes, GM DIrect, Ecklers

It's been going on a month now!

3D-Aircrew

I broke down an ordered the HYP-126022 exact replacement PROM through summit racing. It's on backorder.

Hypertech tells me that their chip is lifetime warranted if I were the original owner ... not. Anyway I hope I'm not wasting my 200$.

When it comes in I'll update youall on the status.

rons85

You are making this code 41 a lot harder than it is - the problem is either a bad/loose PROM, a defective ECM or a bad ground. Period.

You already Have a reman ECM. For the money involved (Approx $100) just get another ECM and plug it in, same PROM chip. Old electronics die, sooner or later. The ECM you have is Already on it's second life..

Then, If you still suspect the chip as the problem get another one - since a "stock" chip is nearly impossible to find (and you probably wouldn't want it anyhow..) just plug in the new hypertec one. Or burn your own (if you want to get that far into it..).

All assuming of course that you really have verified the ground points/circuits first. First - Before starting to throw parts at the thing

Muffin

DaveP85C4, can you ID bin ABTD? Supposed to be for an 86 L98 but have been unable to find it. If this will work in rhaker's 86 I may have a deal he doesn't want to refuse.

3D-Aircrew

It was a bad Hypertech chip. Bought another one since i couldn't source the original prom and she fired right up 1st crank ... no misses ... no code 41.

Thanks everone

3D-Aircrew

I've been told they are rare items to go bad ... but this one was definitely bad.

Just prior to this hypertech prom going down I had to replace my alternator. That and some previous jump starts may have been what damaged the PROM.

I spent a month futzing arround with this issue mostly since I was attempting to source an OEM Prom, and another ECM didn't fix it.

In the end I'm glad I replaced the Hypertech thermomaster PROM since it turns on my fans sooner ... not that I believe I get any better HP figures etc.

racerseks

Hey, thanks for adding this to my post. I have yet to check my connections, and all that...but did read through this. I just replaced my fuel pump, fuel filter, air filter, and put fresh gas in. When I got it to start, it ran real rough. Replaced the MAF, and it was fine for a few days...ran pretty nice for a car that was sitting for about 6 months. Difference for me, is now it won't even start. I'll check my connections, but any time saving advice you may have is appreciated. Thanks!