i have been trying to get this car repaired for a friend, problem it has a service engine code but can't read it . it has obd2 connector & get error code on scanner 2 different ones. the car will start but runs very rough if put in gear usually dies if try to rev a little in park revs some but get some backfires. the 2&5 coil on ignition module doesn't fire, move it to another location such as 6&3 coil fires coil is good have replace the icm & does same thing no fire on 2 5 coil the modules are from orielly auto parts. i could sure use some help, also replaced plugs & wires. put used pcm from wrecking yard used original prom & runs same as original pcm.

What 2 codes did you get returned?

it might be obd 1.5.

as for your issue its hard to imagine what it might be, if not the coils or icm. there is only one wire for the ecm control and if it sparks at all that has to be good. was thinking crank position sensor too but they normally will be no spark at all as well

https://www.gmforum.com/trouble-shoo...m-test-299761/

williame, i cant read codes. thanks

He needs access to either a Tech1 or one of the Actron scanners that can read both 1.5 and 2.0

Best option, goto dealer, cough up the money for a diagnostic only. And no, Autozone can't scan it either. You have the idiotic OBD 1.5 hybrid system.

On-board diagnostics - Wikipedia, the free encyclopedia

A tech II will talk to it also. The good ole 94-95 H body transition experiment!

i replaced the icm with another orielly but the better one & all coils now fire but starts runs rough & no better than before, i'm thinking of towing to gm dealer & let them run the tech2 scanner on it. i can't just be changing parts this gets too expensive. thanks for replies

those are hard to troubleshoot without the right scanner, you want to invest in your own if you intend to keep it a while

what model actron is capable of reading codes on this vehicle? thanks nelson

from the actron webiste


Which Actron Code Scanners and/or Scan Tools work on 1994 & 1995 GM vehicles?
1994 & 1995 GM vehicles were equipped with several different engine computer systems. Follow these steps, in sequence to determine what diagnostic tool is right for your vehicle:

1. Find the PCM (Powertrain Control Module) in your vehicle:

If the PCM is a black box with cooling fins located under the hood, your vehicle is most likely OBD II.
To confirm that your vehicle is OBD II-compliant, check the Emissions Decal located in the engine compartment.
If you determine that your vehicle is OBD II compliant, use either the SPANISH OBD II AutoScanner CP9138S, OBD II AutoScanner CP9135, PocketScan Code Reader CP9125, the SUPER AutoScanner CP9145 or the SUPER AutoScanner Kit CP9150.
If the PCM is a silver box located in the interior of the vehicle, proceed to Step 2.


2. Find the DLC (Diagnostic Link Connector) under the dashboard, usually on the driver'* side:

If the DLC is a 16-pin D-shaped connector, your vehicle is OBD I-equipped, but with the OBD II connector. The proper tool is a SUPER AutoScanner CP9145 or the SUPER AutoScanner Kit CP9150.
If the DLC is a 12-pin rectangular connector, proceed to Step 3.


3. If Pin "B" is present in the 12-pin connector:

Use the GM Code Scanner CP9001or
The SUPER AutoScanner CP9145 with a GM ALDL Cable CP9127 or use the SUPER AutoScanner Kit CP9150.


4. If Pin "B" is not present in the 12-pin connector:

Use the SUPER AutoScanner CP9145 with a GM ALDL Cable CP9127 or use the SUPER AutoScanner Kit CP9150.