GM auto computers
Racer
Joined: Apr 2010
Posts: 409
Likes: 1
From: New York
What year vette do you have. My ECU is at Blue Streak as we speak I am awaiting its return. They spend a few days on it testing and rebuilding it and it seems they really know what is up with the 1992 to 1993 model ecu. Heres a faq from their site
n the short period of time I have been a member here I have of course run into the Opti issue and I had a hard time tracking down what was really causing my no spark. I performed every test for a/c voltage signal to the ICM to continuity testing harness ECU everything. Ultimately it looks like it is my ECU and for good reason. here is a faq from a company that knows this ECU very well and rebuilds them in florida. My Ecu could not be in better hands. I have a 1993 40th ed and Im not sure but this may extend into the Pcms also. Read the faq below
This is what my problem was
Q. I heard that several GM computers that employ surface mount technology (SMT) may
become intermittent in operation over time due to manufacturing defects. Realizing
this, I replaced the ECM in my customers’ vehicle after performing a Tap-test to make
sure that the intermittent problem was in fact due to a defective ECM. However, the
vehicle still has an intermittent miss, even with the rebuilt ECM. Can this problem be
fixed?
A. This problem can be fixed, and it is fixed with every Blue Streak remanufactured GM
SMT computer. The reason that some SMT computers become intermittent is due to
the conformal-coat that is applied to the ECM circuit board. The conformal-coat is
applied to the circuit board to help protect the ECM from corrosion and the elements.
However, after some time, the conformal-coat may shift, swell, or spread, causing the
movement of certain electronic components on the board. This creates the potential
for intermittent contacts between these electronic components and the circuit board.
At Blue Streak, all remanufactured GM SMT ECMs have the original conformal-coat
removed, all solder joints are then re-flowed and the ECMs are exhaustively tested. A
new conformal-coat is then applied using a process that virtually eliminates the reoccurrence
of an intermittent ECM, and the ECM is tested once again. If after
installing the remanufactured ECM you still have an intermittent miss in the vehicle
and you have checked the wiring harness for chafing and shorts, chances are pretty
good that you have a problem with the vehicle wiring harness connector at the ECM.
If you remove the pins from the harness connector and cinch them down, they will
have a stronger grip on the ECM pins. This should eliminate your intermittent engine
miss.
n the short period of time I have been a member here I have of course run into the Opti issue and I had a hard time tracking down what was really causing my no spark. I performed every test for a/c voltage signal to the ICM to continuity testing harness ECU everything. Ultimately it looks like it is my ECU and for good reason. here is a faq from a company that knows this ECU very well and rebuilds them in florida. My Ecu could not be in better hands. I have a 1993 40th ed and Im not sure but this may extend into the Pcms also. Read the faq below
This is what my problem was
Q. I heard that several GM computers that employ surface mount technology (SMT) may
become intermittent in operation over time due to manufacturing defects. Realizing
this, I replaced the ECM in my customers’ vehicle after performing a Tap-test to make
sure that the intermittent problem was in fact due to a defective ECM. However, the
vehicle still has an intermittent miss, even with the rebuilt ECM. Can this problem be
fixed?
A. This problem can be fixed, and it is fixed with every Blue Streak remanufactured GM
SMT computer. The reason that some SMT computers become intermittent is due to
the conformal-coat that is applied to the ECM circuit board. The conformal-coat is
applied to the circuit board to help protect the ECM from corrosion and the elements.
However, after some time, the conformal-coat may shift, swell, or spread, causing the
movement of certain electronic components on the board. This creates the potential
for intermittent contacts between these electronic components and the circuit board.
At Blue Streak, all remanufactured GM SMT ECMs have the original conformal-coat
removed, all solder joints are then re-flowed and the ECMs are exhaustively tested. A
new conformal-coat is then applied using a process that virtually eliminates the reoccurrence
of an intermittent ECM, and the ECM is tested once again. If after
installing the remanufactured ECM you still have an intermittent miss in the vehicle
and you have checked the wiring harness for chafing and shorts, chances are pretty
good that you have a problem with the vehicle wiring harness connector at the ECM.
If you remove the pins from the harness connector and cinch them down, they will
have a stronger grip on the ECM pins. This should eliminate your intermittent engine
miss.
Last edited by Mikes1991; Aug 31, 2010 at 02:45 AM.
