Ok about 2 weeks ago I went to drive my car and it stalled pulling out of my dirveway. I rolled it back into the garage and havent been able to start the car since. I checked the fuel pressure with a guage and all is fine and holds for about 30 minutes. I checked the injectors with a noid light and all fine. I obtained the datamaster software and it keeps on pulling code 42 EST grounded. Another issue it has is that it disconnects from the pcm after about 10 seconds or so and then reconnects. I bought a new igintion yesterday and same issue. Looking at the service sheets it could be the pcm. My question is has anyone had a similar issue and where are places that sell 1993 computers?

 

In 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.

My ECU is now in this companys hands and it is obvious they know what they are doing. The company is called blue streak

 

here ya go

Blue Streak America Inc.

 

Fixed mine it was the spark control module. Woo hoo.

 

Mike, I've got very similar issues and want to get a new ECM for my '95 6-speed. However, I just called Blue Streak and Rebecca in Customer Service said that I have to work with a corporate account to get my ECM sent in and repaired.

Who did you work through for your ECM issues? Thanks...

 

Hi there
Ok well I have a business account here on Long island with the local Pep boys and the manager is the one who hooked me up so well with their corperate account. I can arrange to have your ecu sent in through him but you would need to throw him a 50 spot to do it. If you are interested in doing this and it is very worth it because he gets a fabulous rate as he did for me. I can find out about it for you through him. Just let em know and Ill do what I can to help you. Im almost certain i can get this done because we get along very well

 

Thanks, man! I checked with Blue Streak and RockAuto has a corporate account as well. $92 plus $15 S+H.

I tried replacing the Opti, ICM and still have ignition troubles. Looking at that ECM like it's the next to get repaired!!!