Bad ECM?
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Bad ECM?
Over the past little while, I've been battling a Code 33. IT's a MAF code. Here's the story...
I bought a MSD 6AL, FMS 30# injectors and a couple other odd little things. I had a custom built Ed Wright FASTCHIP in it, and everything ran fine. With these new upgrades, the car ran really rich and kinda crappy. So, my mechanic threw the stock chip in and voila, it ran 10 times better. But now, it's throwing a code 33 and having really bad idle issues. We tried to set the idle up, but no such luck. I replaced the MAF and the relays. I recently read a post about a bad ECM being the cause of the bad idle and code 33. How can I tell if my ECM is bad? I am going up to Agostino Racing soon for a dyno tune and chip burn. I hope this will end the problems, but the ECM going bad on another forum member peaked my curiosity. So, how can I tell if my ECM is going bad?
I bought a MSD 6AL, FMS 30# injectors and a couple other odd little things. I had a custom built Ed Wright FASTCHIP in it, and everything ran fine. With these new upgrades, the car ran really rich and kinda crappy. So, my mechanic threw the stock chip in and voila, it ran 10 times better. But now, it's throwing a code 33 and having really bad idle issues. We tried to set the idle up, but no such luck. I replaced the MAF and the relays. I recently read a post about a bad ECM being the cause of the bad idle and code 33. How can I tell if my ECM is bad? I am going up to Agostino Racing soon for a dyno tune and chip burn. I hope this will end the problems, but the ECM going bad on another forum member peaked my curiosity. So, how can I tell if my ECM is going bad?
Le Mans Master
Joined: Dec 1999
Posts: 8,540
Likes: 1
From: And on the fifth day, subpoenas were served to Obama senior staff
Re: Bad ECM? (black_89_vette)
I had a bad ecm in my 89. David F posted that this was common as they had a problem. However I never had a 33, just 15 and then high voltage code (forget #).
If you do a search on code 15 in the archieves I think you will find David's comments.
One thing you could check is your +5V source at the TPS and CTS to see if it's +5 or messed up.
If you do a search on code 15 in the archieves I think you will find David's comments.
One thing you could check is your +5V source at the TPS and CTS to see if it's +5 or messed up.
Drifting
Joined: Mar 2001
Posts: 1,636
Likes: 3
From: Lafayette IN
Re: Bad ECM? (black_89_vette)
I had fine running at times and all the sudden out of the clear blue I would get a code 33 (on my 90 MAP setup). Same idea with the code though.
My problem was that the chip was not securely socketed in the computer. I should have gotten a bunch more codes, but 33 is the only error I ever had reported.
My problem was that the chip was not securely socketed in the computer. I should have gotten a bunch more codes, but 33 is the only error I ever had reported.
