Bad ECM? DTC 63
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
I have a chip from PCMforless to tune for my mods. The car will not run at all with the stock PROM. The communication issues started to happen with the piggyback pcm so I decided to at least establish communication with the stock. I can not communicate with either.
I had stock injectors but the car ran worse and had a bad misfire. I believe one of the injectors was plugged. The new ones smoothed it out considerably, but that's when the knock started. I tried to diagnose timing to fix the knock, which lead to trying to get a data dump, which lead to my car not communicating, which lead to this thread.
A long and winding road.
I had stock injectors but the car ran worse and had a bad misfire. I believe one of the injectors was plugged. The new ones smoothed it out considerably, but that's when the knock started. I tried to diagnose timing to fix the knock, which lead to trying to get a data dump, which lead to my car not communicating, which lead to this thread.
A long and winding road.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
I hate to ask but you did have the power disconnected when you messed with the ECM correct?
The stock GM injectors will stick if they set up for any amount of time but it is prety simple to fix, I use a set of test leads and a toggle switch and connect one jumper to +12 VDC and the other to the toggle Sw that has ground on the other side of the SW. With the injector in the rail and the other end in a jar I flip the SW and tap the injector and it will usaly fire and be good as new, well good enough anyway. I had 7 of 8 stuck shut on my last motor and all 8 worked fine after I did this.
The stock GM injectors will stick if they set up for any amount of time but it is prety simple to fix, I use a set of test leads and a toggle switch and connect one jumper to +12 VDC and the other to the toggle Sw that has ground on the other side of the SW. With the injector in the rail and the other end in a jar I flip the SW and tap the injector and it will usaly fire and be good as new, well good enough anyway. I had 7 of 8 stuck shut on my last motor and all 8 worked fine after I did this.
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Originally Posted by FD2BLK
I wish you had a 94/95 I would ship you my spare ECM to give it a shot.
Besides, I'd rather put my computer in another car. I'm worried that if the problem is in my car's wiring than she'll damage another ECM. It's safer to do the swap the other way.
I
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Originally Posted by FD2BLK
I hate to ask but you did have the power disconnected when you messed with the ECM correct?.
Originally Posted by FD2BLK
The stock GM injectors will stick if they set up for any amount of time but it is prety simple to fix, I use a set of test leads and a toggle switch and connect one jumper to +12 VDC and the other to the toggle Sw that has ground on the other side of the SW. With the injector in the rail and the other end in a jar I flip the SW and tap the injector and it will usaly fire and be good as new, well good enough anyway. I had 7 of 8 stuck shut on my last motor and all 8 worked fine after I did this.
