truck runs ruff when first started then clears after a few minutes has code p1345
This is crankshaft to camshaft correlation faulty. In other words your camshaft and crankshaft are not in the proper positions in relation to each other. Sounds like a timing chain problem. Are you experiencing loss of power and the engine running hot or boiling over when you shut it off? If so, it's definitely a timing chain problem. This is especially suspect if you have a lot of miles on your truck. One other possibility is a worn out harmonic balancer. A harmonic balancer that has a lot of play in it will make the computer "think" the crankshaft is in the wrong position in relation to the camshaft. HTH. -Jim
i got 65,000 original miles, starts easy, runs rough. when I give some throttle it eventually clears up then runs fine until i shut it off. happens only when first starting it
That trouble code is suggesting that something is going on with the timing chain. HTH. - Jim
could it b crankshaft sensor or camshaft sensor?
I doubt it. You'd be getting a different trouble code if it were. HTH. -Jim
Looking for a Used Sierra 1500 in your area?
CarGurus has 64,325 nationwide Sierra 1500 listings starting at $2,275.
Search GMC Sierra 1500 Questions
GMC Sierra 1500 Experts