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Odd fuel issue...

This is a discussion on Odd fuel issue... within the General Help forums, part of the LSx Technical Help Section category; When I leave my car more than 30 minutes, it has a hard time starting (even after priming fuel system ...

  1. #1
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    Odd fuel issue...

    When I leave my car more than 30 minutes, it has a hard time starting (even after priming fuel system 5 or 6 times), idles bad, then runs like a champ. I can cut it off immediately then fire it right back up though. It did throw two codes, P0200 (Injector circuit malfunction) and P1635 (5v reference circuit). I am thinking it is a bad ground SOMEWHERE (I checked the back of the head and that one was good) and I am at a total loss. So any input at all would be amazing!

    Thanks,
    Kyle

  2. #2
    Veteran 0rion's Avatar
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    06 duramax

    go to gearchatter.com and read the dtc guide for that 1635.... I just skimmed it and it could be a short somewhere. That 5v reference is for your tps, map, and egr.

  3. #3
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    I read the gearchatter forum and I'm gonna try and troubleshoot some tomorrow...

  4. #4
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    OK. I got a fuel pressure gauge and monitored it all day. It is EXACTLY where it should be. When the car is off, it never dips below 30PSI. Still extremely stumped...

  5. #5
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    fuel pressure should be ~58psi with the key on.

  6. #6
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    Yeah, it is dead on 58-60PSI as soon as I click the key. I think my injector(s) are bad...

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