I will get right to the point. 2007.5 GMC Sierra 2500hd LMM. Started out with a slight tick l took it as a injector. 125,000 miles on it. Ticking noise would come and go. Ran fine no codes then I got a Reduced Engine Power. I put new fuel lines on from engine to the cooler to the fuel tank. Thinking maybe a kink in the fuel lines. Since then I’ve changed fuel filter head (new) fuel filter, all rubber fuel lines for the fuel filter housing, cp3 rubber lines, new FPR. Truck cranks over great but won’t start. Scanner showing fuel rail pressure 7000 to 8500 psi at cranking still no start and no smoke at exhaust. If I had a couple of injectors go bad would that cause a no start and no smoke coming from the exhaust. Thanks for any help
LMM Headache
- Thread starter ovnttim
- Start date
Check the pins in the main harnesses on top of the drivers side valve cover where they connect together. Couple might be pushed in and they will cause a no start condition.
Checked the pins they all look good. I thought maybe it was getting air though my fuel lines so I’ve disconnected those lines and have two clear lines connected to the engine and put in a five gallon diesel container. I can pump filter primer top and get a solid feel. While cranking I don’t see any fuel being drawn in.
That’s my next check. I’ve read about that happening. Do you know how I can check it.
to check if its loose, you can usually snake a little screw driver in the hole the crank sensor goes in and see if its loose but to see if its spun, you either need a scope on the sensors to watch for the cam crank corrilation or pull the front cover and inspect it.