Hello everyone I have a 2007 tahoe z71 package and I am having a problem with extended crank. I put a fuel pressure gauge in it and while running it’s at a out 58-60 psi shut it off and it sat at 50 psi ish let it sit for 2hours and it dropped to 10psi then turned key on and jumped back up but had extended crank. But if I let it sit over night it fires right up normal. It dose gave a new fuel pump in it. It did the same thing before the new pump and after the new one it seemed fixed then after about 3 months it’s back . At this point I’m stumped other then maybe a injector stuck and flooding it and when it sits over night by then it’s all evaporated and starts right up. I’m I wrong on this. And if not how do I tell witch injector . Also it dose it on e85 and regular fuel . Oil dose not smell like fuel and is not thinned out .
thanks you in adanved .
It sounds like it may be flooding when it leaks down after shutdown. That might explain the normal start the next cold start, but the long crank when warm.
An injector(s) not shutting off completely could account for the pressure bleed and a flooded warm start. You might try a flood clear procedure when you expect the warm start long crank. If it catches briefly during flood clear, it might be time to take the injectors down for a test.
The bad news is your trims should be off some if the injector is not fully shutting off.
