John Deere Parts guy
Join Date: Jan 2009
Location: West-Central Indiana
Sounds like you should pull the valve cover back off, pull that injector and use a borescope to check that cylinder. Probably washed that cylinder down and has some significant scoring on the walls being that it is that low on compression. Does it have a lot of blowby coming out of the pcv vent tube at the lower right front corner of the engine, or out the oil fill tube with the cap off?
It all depends how much money you want to spend on this truck. I mean, you're already into it for injectors now. You might be just as well off to buy a replacement engine and put your new injectors in it and go on. If the cylinder is scored and has to be machined, you'll be buying pistons; if you're buying pistons, you might as well buy rods; then you might as well buy some other goodies to go with all that and have some real fun with it. But, then again, if you're wanting it to be a work truck or just a dependable non-performance truck, that's probably not the best path to follow...
ASE Certified, former GM Parts guy
John Deere Service Manager
Play Truck - 2002 LB7 2500HD Crew Cab Short Bed
Daily/Tow Rig - 2006 LLZ 2500HD Crew Cab Short Bed
- 2007 LBZ 2500HD Standard Cab Long Bed SOLD
- 2006 LBZ 2500HD Crew Cab Short Bed SOLD
- 2004 LLY 2500HD Crew Cab Long Bed TRADED
- 2002 2500HD Crew Cab Long Bed SOLD
- 2001 2500HD Ext. Cab Long Bed