1997 GMC K3500 dually 4L80 4x4
I was having some issues with my 94 Blazer after an injection pump replacement recently. I performed a TDCO with the pump too far advanced and it set a code 88. There is a learning curve with these with Time Set and TDCO and it’s a little confusing at first as I found. I now have a much greater understanding! Anyway, the code 88 set as a hard code and TDCO was -2.02. If I cleared the code with GMTDscan Tech it would come right back with the ignition on, but not running or cranking. Reading previous threads I found one where OkDually said the ECM needed to be replaced at this point which made sense since if you can’t clear the codes, you can’t run another TDCO. I bought an ACDelco reman ECM and was able to get it running great again.
Thanks for the information. Glad you got it running.