Quote:
Originally Posted by tlorber
1) I don't appear to have any tach signal coming from the PCM wire. Does anyone know any diagnostics for that?
2) PCM is throwing a P0068 Code which is a conflict between MAF Sensor/Throttle Position Sensor/MAP sensor (this truck is drive by wire). Also, this might be related, but I have a bit of a lag between when I stab the throttle at idle and when it speeds up.
Any input will be greatly appreciated.
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1.) Could be a connection issue, pin pushed out in the harness at the ecu. Also the tach and/or ecu will have to be set correctly to run the tach, as an LS style engine doesn't give the true 8cyl signal.
2.) The pedal and throttle body may need to go through a relearn process in order to function together.
Have you posted these questions in the LS swap section? There is a member on here "aknovaman", who does all of my tuning. He is a true wizard when it comes to the wiring.
Great progress! I too am building a 1-ton LS powered GMC.