What is the wiring harness on top of the filter housing for?
@sam4italy
4 жыл бұрын
Very informative video, we've got a 07 duramax in with an intermittent no start, once died right after starting towed in and the primer was loose, had glow plug codes and so we replaced all of them, primed fuel and it started, ran for 40 min no problem, customer drove 40 miles and it died, he primed it and it drove back to us, we let it sit overnight and it started no problem, I attached a gauge to test port and primed it and the gauge went from 20 psi to 0psi in about 10 seconds,but if i clamp supply to injection pump it holds, any ideas? Should i test injector return flow or suspect injection pump or filter head still
@concretebaron5759
2 жыл бұрын
im having that problem now . its in the shop. what was your problem?
@sam4italy
2 жыл бұрын
@@concretebaron5759 I'll have to check for sure tomorrow, its been a while but I'm pretty sure he was fine after we put a filter head on it.
@nilton1044
5 жыл бұрын
Nice video👍👍 how much psi is there suppose to be on the injector fuel rail when cranking the engine? My engine doesn’t start and I have about 4500psi when cranking that shows up on the scanner
@gmsonly5087
5 жыл бұрын
If this engine is cranking, but doesn't start, you won't see 4,500 PSI, or at least you shouldn't. Are you looking at the desired, or the actual pressure? Without having any specifics on the type of vehicle you're working on - LB7, LLY...I can generalize DTC's stored? And not just ECM, but on the Class 2/Low speed GMLAN. Do the other modules communicate? Even though the ECM/TCM... communicate on the CAN, High Speed GMLAN, there are signals that need to be there for this vehicle to start that are on the low speed network(s) Is there B+ on the Ignition 1 signal Does the supply side prime and can you develop a minimum of 8 PSI pressure? Does it hold/maintain that pressure?Is there cranking RPM? There's a few steps more before you're actually looking at the CP3/HPP. My suggestion would be to look at a flow chart for the Engine Cranks But Doesn't Start. Sorry I couldn't be of more help.
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