GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.If you fuel fouling all the spark plugs and running rich I would also install a fuel pressure gauge and monitor the fuel pressure. Normal pressure needs to be right at 41 to 47 PSI. Check this for me and post back with the results and we can work from there. Also if you can, give me all the actual fault code and or codes your getting and we can work from there.
Fuel pressure looks okay . The code P0107 usually means you have a low voltage concern to the MAP but if your getting 5 volts reference it should be fine. I have to wonder if you fuel fouling the spar plugs anyways that perhaps your PCM has failed. Injector pulse is controlled by the PCM.
A bad ETC can cause a rich condition but it will in most cases set a fault code. If you sure the MAP is oaky then this dose point towards a failing PCM.
Anytime you install a PCM new or used it will require programming.
Either one would work, you may want to start with a used one first as it would be more cost effective.
Im not aware of any place that sells them this way. You may want to check with your salve yard to see if by chance they have the ability to do so.
Unfortunately no there is not. The only other way is to remove it and send it in to a company that build them and have it professionally checked.
The problem is going to be with the Pass-lock system , there is different programming from truck to truck.
Okay hopefully that resolves you problem.
Well that would sure make since. Clean you fouled plugs and see if it clears.