1992 c1500 5.7l hard start when warm

Discussion in 'Engine Performance + Maintenance' started by littlemlittle, Jan 17, 2020.

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  1. littlemlittle

    littlemlittle OBS Enthusiast

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    I'll drive it to the store to get groceries, shut it off run in the store for about 30 minutes. Come out and it does this.

    Starter doesnt engage and then I shut the key off and do it again it struggles.

    I replaced the starter and it still does it after its warm.

    Rebuilt 5.7l

    I have replaced the coolant temp sensor (front of intake)

    Maybe the map or ignition control module?



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  2. PlayingWithTBI

    PlayingWithTBI Desert Old Guy

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    What's your base timing with the EST wire disconnected? It should be set to zero* with a timing light.
     
  3. littlemlittle

    littlemlittle OBS Enthusiast

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    I made sure it was 0 when I started it up, after the break in and everything. Made sure it was reading correctly and then plugged it back in. (Shutting truck off first)

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  4. PlayingWithTBI

    PlayingWithTBI Desert Old Guy

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    Did you calibrate your TBI controls?

    TBI tuning-website - Tuning the TBI.pdf

    I'm asking so you don't have to start throwing parts at it. How about putting a scanner (not a code reader) on it and see what it looks like when it starts OK then, when it doesn't? I have seen and heard of the ICM going out especially, if it's not a quality brand like AC Delco or Delphi.
     
  5. littlemlittle

    littlemlittle OBS Enthusiast

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    I have not calibrated the tbi controls I will look into that. I also dont have a scanner, so I wont be able to look at that.

    My engine light isnt on but I might jump the connection to see if it reads anything, guess it wouldn't hurt?


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  6. littlemlittle

    littlemlittle OBS Enthusiast

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    I went to check the timing again.. dist bolt was a little loose. Also found out maybe my fuel regulator is leaking?

    Tell me what you think. I know it's not supposed to be back there..

    I also plan on doing some spark plug wire organizing this weekend..

    Also sorry for the poor quality cell phone video.



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  7. littlemlittle

    littlemlittle OBS Enthusiast

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    Well, i rebuilt the fuel regulator, put a new gasket on the fuel line plate? (Underneath regulator) and put a new icm in and it runs much better.

    I guess it was dumping too much fuel in with that leak. It has a much better throttle response.

    Thanks for the help.

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