03 387 Peterbilt, CM 870 electrical nightmare crank no start

[Rawze]

Your post was all over the place like a bowl of spaghetti.

Are you saying that with ether.. it fires off and stays running on its own after that?. - Are able to drive away? .. or it just fires off a bit and dies again?. -= you were not very clear on that.


As far as the electric lift pump goes... there is a relay buried in the engine wiring harness that controls it via the ecm. I have seen many trucks where the relay was missing, or had gone bad. Also, sometimes the lift pump itself is bad.

Any ways ... to troubleshoot fuel supply + engine no start issues ...

Monitor the fuel pressure in Insite while cranking. If it is not above a set pressure reading, the engine computer will not even try to fire the cylinders.

here is a similar thread...
http://rawze.com/forums/showthread.php?t...6#pid11426