Starting

20

Asked by Mar 22, 2016 at 11:44 PM about the 2010 GMC Sierra 1500 SLE Crew Cab 4WD

Question type: Maintenance & Repair

The other day my truck died on the
interstate, and would not start back up.
Had it towed. It has 55-60 psi at the fuel
rail, the only code was after trying to start it
the P0340 popped up. Replaced cam shaft
position sensor. Still won't start. Checked
for spark on all right plugs, it's getting fire.
While checking compression, the starter
stopped engaging the flywheel. Spins but
doesn't turn the flywheel. I pulled the
starter and the shaft was loose. Replaced
with a new starter and same thing, starter
spins, won't engage the fly wheel. These
are two separate issues I believe. The truck
is the 5.3 liter with engine code 3 for the
vin. It also has the fuel driver module and
fuel pressure sensor rather than a relay and
fuse for the fuel pump.

3 Answers

425

out of curiosity have u tried to turn engine by hand to make sure that its not lockup...

20

Actually yes I have. I rotated the engine with the crank shaft bolt and it turns just fine. The teeth on the fly wheel look to be intact as well. I'm going out today to look at it again in the daylight and check the bolts in the face of the flywheel to make sure they are tight.

20

Update. Checked and the whole engine is turning with the starter. It was a duh moment for me. Starter was ok. However compression tests on the cylinders revealed cylinder 5 and 8 have zero compression and cylinder 6 has 60 psi. All the others are 120 psi + or - 2psi. Engine is toast, I am assuming.

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