A buddy of mine bought an 01 4x4 dually recently. It has an intermittent no start. It doesn't seem temperature related. Happens every week or so without any pattern. Sometimes on a cold start, sometimes after sitting only a short period. No codes at all, looked with efi live and gm tech tool. Looking through some searches, i need to check the wif/filter housing for leaks. Truck runs well, no power loss. 89,000 on the odometer with a fresh fuel filter. Any other suggestions? Thanks in advance.

on edit.
When the truck doesn't start, it will eventually fire up after repeated crank attempts. Truck always cranks over......

I don't know what causes it, but try priming it once or twice. I've heard of a few that do that, but was given no explanation. I was told it was nothing terribly bad, but who knows. That's all I can tell you.

Had a big Cat doing that this summer,drove me nuts. Ended up tracing the fuel silenoid wire through the harness,and found a pin corroded in one of the big connectors. You'd think it cut out while running,but it never did.

Thanks guys....anybody else?

sounds like injectors to me have your return rates checked