GMC Troubleshooting Questions? Ask a Mechanic for Answers
I am sorry your having this problem
everything replaced was to correct this issue ?
no codes set ?
any access to a scan tool to view live data ?
is the idle screw plug removed where you can see the idle screw to put a torx in to turn it ?
A friend has a mechanic he knows and the only code that came up was for the fuel cap. Don't know of any problem there. Don't know about any plug for an idle screw on this throttle body?
Hello, My name is***** will see if I can help you. As you know you have replaced pretty much all the normal items that can be the faults. If you and your friend have reviewed it with no codes and you have checked the fuel trims as well to make sure they are within normal range. I would be sure the egr valve is closing all the way when this twould he idle issue is present. I reviewed all the old GM tsb's and alldata tsb's and nothing matched there. I do know that these ECM's did present some odd type issues that create situations like yours. these also have a PROM chip inside the ECM as well which could be your source of fault.
I really don't think your answer is satisfactory for payment. I have already came to the conclusion of the ecm which also includes the prom chip. After having tried everything I have the ecm is only a last resort. I don't think Just answer has come through this time.