Figure THIS one out..

amy

I just replaced a defective ECM in my 86.
The old one was a 1227165, I put in a 16198259. I used my old PROM, Delco # BUA 1728.
The ECM gives me only a code 12. But it will not idle, and is dumping so much fuel into the engine, that after running for 45 seconds, the garage is filled with gas smoke. I did NOT have this problem before.
The reason I replaced the ECM was because it was throwing out a bunch of false codes. Now I get no codes, but something else is wrong.
Even if nothing is wrong with the PROM, is it an OK number to use with the updated ECM? The previous advise I got here on the Forum about updating the ECM made no mention of using a different chip, and no part numbers for that were given either. So I assume I'm ok using the original.  SO.....
Where else should I look for this rich running problem ? It's too much of a coincidence to not be connected with the ECM replacement.2]

DI2FLYView Public ProfileSend a private message to DI2FLY
Lafayette IN

   Re: Figure THIS one out.. (DI2FLY)
Couple things.

1) You don't have to replace the MEMCAL when you replace the ECM. As long as your Vette is still a 350 with a 700R4 and 3.07 rear end gearing, this should be an OK chip to use.

2) Since the problem is at startup, keep some of these things in mind2]

HighHopes85View Public ProfileSend a private message to HighHopes85
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Roseville California   Re: Figure THIS one out.. (HighHopes85)
Thanks for the info. MAF was checked out to be OK. Both MAF relays were just replaced.
I will check the other items you mentioned.
Could the new ECM be bad even though it flashes a code 12 ?
I figured maybe some injector banks are stuck open, but I hate to run it long enough to check for that.
Any info is appreciated.:seeya  

DI2FLYView Public ProfileSend a private message to DI2FLY
Lafayette IN

   Re: Figure THIS one out.. (DI2FLY)



Could the new ECM be bad even though it flashes a code 12 ?

I blew a driver in the ECM and my passenger side bank of injectors weren't firing. It showed a code 12, still idled because the O2 sensor was on the drivers side...

ECMs are usually put through some sort of testing before they are shipped out. In fact, every time I have blown an ECM (somewhere around 5 to date...I like lifetime warranties) I have usually found the direct source of the problem. So IOW, I have never had one just bite the dust outta thin air and have never had a refurbished bad one. But weirder things have happened to me.  :eek:

HighHopes85View Public ProfileSend a private message to HighHopes85
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Roseville California   Re: Figure THIS one out.. (HighHopes85)
OK
I'll look past the ECM and focus on the wiring for now. I guess I should look for a short or improper ground. This'll be an all nighter, I can see.... :mad

DI2FLYView Public ProfileSend a private message to DI2FLY
Roseville California   Re: Figure THIS one out.. (HighHopes85)