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Chevy CK3500 Vortec 5.7L 150,000 miles Won't stay running


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MiRepo
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Oct 15, 2009, 12:33 PM

Post #1 of 5 (159 views)
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Chevy CK3500 Vortec 5.7L 150,000 miles Won't stay running Login - Sign Up

Help me before I kill my truck. My Chevy 5.7L Vortec 150,000 miles. Replaced fuel filter when I was noticing bad mpg. Then a week after my truck was idling and would lose rpm and stall. Replaced fuel pump. Still would idle for one minute and stall. Replaced egr valve, still same problem. Replaced every single sensor, new battery and cables, took apart intake, checked injectors, all fine. Still same thing idle and then stop. Rented a computer to diagnose problem, no code tried this for twelve hours still no code . Rented a fuel pressure gauge and found that the fuel filter I first purchased was bad replaced again, and again, and again. Now I believe I blew my fuel regulator and the wiring harness. I have spent over $1600 in parts on this truck in less than two weeks I'm out of money need to get back to work. I wanted to bypass the wiring harness by installing a toggle switch to manually turn on the fuel pump. Can anyone give me an idea of what the heck is wrong and how I can get this thing running for less than $100. PS I've had two mechanics over and this is what their telling me to do, but even they can't figure out whats going on. Each step I take doesn't resolve the issue. Help!


milling machine
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Oct 15, 2009, 7:55 PM

Post #2 of 5 (154 views)
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Re: Chevy CK3500 Vortec 5.7L 150,000 miles Won't stay running [In reply to] Login - Sign Up

You should check out Jim Linder's article on the vortec's fuel system it might help you.


Hammer Time
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Oct 15, 2009, 8:03 PM

Post #3 of 5 (150 views)
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Re: Chevy CK3500 Vortec 5.7L 150,000 miles Won't stay running [In reply to] Login - Sign Up

Forget the toggle switch nonsense.

What exactly is the truck doing? Is it just stalling and starting right back up?




78 Corvette Pace Car For Sale-18k mi orig-Florida




Hammer Time
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Oct 18, 2009, 6:02 PM

Post #4 of 5 (127 views)
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Re: Chevy CK3500 Vortec 5.7L 150,000 miles Won't stay running [In reply to] Login - Sign Up

Taken from second question started

Quote
Thanks for the feedback. I've had two more mechanics out here and they still are just confused as I am. The mechanic was the person that recommended the toggle switch idea. Now I've added a new starter to the new parts list. Sometimes it starts and sometimes it doesn't. When it does start it will sometimes run for one minute and other times for a few hours. I still am disgusted and pretty much totally fed up. Any suggestions, please let me know. All I can think to do is put a good carb on this thing. It seems to only want to run when I pour fuel down the throttle body. I still want to kill my truck, but I I love it.


I have deleted the new question you started. If you expect anyone to be able to help you then you need to stay in one question and be a lot more clear of exactly what your problem is and what the truck is or isn't doing so we can follow this.

It sounds like what you need to do is use a fuel pressure gauge to monitor what your fuel pressure is doing. This engine is very pressure sensitive and even a few pounds below the factory spec of 55-60 psi and Open Throttle 66 psi

will cause it not to start




78 Corvette Pace Car For Sale-18k mi orig-Florida




(This post was edited by Hammer Time on Oct 18, 2009, 6:03 PM)


Hammer Time
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Oct 20, 2009, 1:33 PM

Post #5 of 5 (113 views)
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Re: Chevy CK3500 Vortec 5.7L 150,000 miles Won't stay running [In reply to] Login - Sign Up


Quote
Ok, I'll explain in detail again.
parts replaced
1. iac valve
2. egr
3.mass air sensor
4.crank trigger
5. fuel regulator (sucked bad great engineering)
6.fuel relay
7. now the fuel pump will only cycle one time and then no more. not sure if the computer is telling the fuel pump what to do or what
8. should i replace the computer??????????
help please i have been working on this for three weeks and still nothing ( oh yea if i hook fuel pump direct to battery the truck will idle but will not rev at all just noses ove and dies )





Please stop creating new questions




78 Corvette Pace Car For Sale-18k mi orig-Florida






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Chevy CK3500 Vortec 5.7L 150,000 miles Won't stay running




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