As my topic says I am having issues with reading codes and engine idling smooth, then rough, then stalling!
First let me tell you the story behind this, it is a 94 base model 3.4 L with 160,000 kilometers and before all this happened the car ran without issues.
So,while driving I got major hesitation from the engine, check engine light came on and I could smell burning from under the hood, pulled over and shut down the engine. Popped the hood and there was smoke coming from around the EGR Valve and I could smell rubber burning. Let this all cool down and started the engine, the EGR Valve gasket (the metal one between the solenoids and base let go, it melted spark plug wire #3 and I could see arching, the heat also melted the wire loom around the wires to the EGR Valve. I suspect it has been like this for a while!
Here is where the repairs begin.
1. I bought a new OEM EGR Valve and installed with new flange gasket.
2. Installed new wires and plugs, it was so hard to remove the wires that I cut 1,3 and 5 and the spark plugs were so badly rusted, although I have had the car for 8 years I only put on 20,000 kilometers so plugs and wires were not a thought.
3. Cut away all the damaged wire loom and all looked good, nothing burnt.
4. Now for the test, removed the negative post from the battery to clear codes and started the car, it started right away,ran great for about 3 minutes then went into a idle that sounded like I have a loppy cam, check engine light came on and it ran better, how can this be! Restarted and same scenario.
5. So now for the code checking, the usual paper clip to ground does not work on this car as I have read in these forums so I bought a Innova 3130C with adapters for OBD-1 and it would not connect to pull codes, I have read a lot in these forums about how these Innova work and don't work so i found locally two early GM code readers, a Equus 3008 and an Innova 3123, both of these would not connect.
6. I have checked all fuses, power to the OBD-1 connector and all is good!
Now I need some help, is this a bad ECM? I mean would the engine even run if it was corrupt?
Do I need to take the car for a drive to restore some parameters in the ECM?
Why I can't pull codes bewilders me, can all three readers I have be unable to read codes for some reason.
I am leaning toward taking the car to a local shop where they he can attach there Snap-On reader and see what they get.
Any suggestions would be greatly appreciated.
Thanks,
Corky
First let me tell you the story behind this, it is a 94 base model 3.4 L with 160,000 kilometers and before all this happened the car ran without issues.
So,while driving I got major hesitation from the engine, check engine light came on and I could smell burning from under the hood, pulled over and shut down the engine. Popped the hood and there was smoke coming from around the EGR Valve and I could smell rubber burning. Let this all cool down and started the engine, the EGR Valve gasket (the metal one between the solenoids and base let go, it melted spark plug wire #3 and I could see arching, the heat also melted the wire loom around the wires to the EGR Valve. I suspect it has been like this for a while!
Here is where the repairs begin.
1. I bought a new OEM EGR Valve and installed with new flange gasket.
2. Installed new wires and plugs, it was so hard to remove the wires that I cut 1,3 and 5 and the spark plugs were so badly rusted, although I have had the car for 8 years I only put on 20,000 kilometers so plugs and wires were not a thought.
3. Cut away all the damaged wire loom and all looked good, nothing burnt.
4. Now for the test, removed the negative post from the battery to clear codes and started the car, it started right away,ran great for about 3 minutes then went into a idle that sounded like I have a loppy cam, check engine light came on and it ran better, how can this be! Restarted and same scenario.
5. So now for the code checking, the usual paper clip to ground does not work on this car as I have read in these forums so I bought a Innova 3130C with adapters for OBD-1 and it would not connect to pull codes, I have read a lot in these forums about how these Innova work and don't work so i found locally two early GM code readers, a Equus 3008 and an Innova 3123, both of these would not connect.
6. I have checked all fuses, power to the OBD-1 connector and all is good!
Now I need some help, is this a bad ECM? I mean would the engine even run if it was corrupt?
Do I need to take the car for a drive to restore some parameters in the ECM?
Why I can't pull codes bewilders me, can all three readers I have be unable to read codes for some reason.
I am leaning toward taking the car to a local shop where they he can attach there Snap-On reader and see what they get.
Any suggestions would be greatly appreciated.
Thanks,
Corky