jester Posted June 19, 2015 Share Posted June 19, 2015 I just did an in frame rebuild on a MP8 including a new wiring harness. When I tried to start it. the starter relay kicks out. will turn over if you short the starter, but still while not start? I will also add no codes are coming up on the dash Quote Link to comment https://www.bigmacktrucks.com/topic/40565-mp8-no-start-after-rebuild/ Share on other sites More sharing options...
Dirtymilkman Posted June 19, 2015 Share Posted June 19, 2015 Make sure your head is grounded to the engine. Not sure if those work that way or not. But some motors the head needs to be grounded to the motor Quote Link to comment https://www.bigmacktrucks.com/topic/40565-mp8-no-start-after-rebuild/#findComment-293939 Share on other sites More sharing options...
220cummins Posted June 20, 2015 Share Posted June 20, 2015 Start withe the easy stuff grounds and circuit breakers. What truck is it? Did you check the fusable link? I recently had a GU granite that had power to the chassis and the fusable link was only halfway burned through. Quote Link to comment https://www.bigmacktrucks.com/topic/40565-mp8-no-start-after-rebuild/#findComment-293964 Share on other sites More sharing options...
Macktech689 Posted June 20, 2015 Share Posted June 20, 2015 Sounds like the crank and cam sensors are hooked up backwards, the ECM will disengage the starter because it sees 4000 RPM. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/40565-mp8-no-start-after-rebuild/#findComment-294025 Share on other sites More sharing options...
Challenger Posted June 27, 2015 Share Posted June 27, 2015 Sounds like the crank and cam sensors are hooked up backwards, the ECM will disengage the starter because it sees 4000 RPM.Ive done this before. I plugged the connectors in the way I THOUGHT they ran and was wrong. Quote Link to comment https://www.bigmacktrucks.com/topic/40565-mp8-no-start-after-rebuild/#findComment-294846 Share on other sites More sharing options...
TRH Posted June 28, 2015 Share Posted June 28, 2015 Third on the check cam/crank position sensors for proper plugging. Mack has changed the wiring harness now to, theoretically, make it impossible but it can still be done. And of course check, and recheck, grounds; is there power going to the IMS (miniature solenoid on the starter), and is it hooked up correctly or did the wires possibly get reversed? Quote Link to comment https://www.bigmacktrucks.com/topic/40565-mp8-no-start-after-rebuild/#findComment-294884 Share on other sites More sharing options...
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