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Wont stay running

This is a discussion on Wont stay running within the General Help forums, part of the LSx Technical Help Section category; Ok so I have a 99 trans am start up fine gets to operating temp and the engine starts sputtering ...

  1. #1
    Junior Member
    Join Date
    Mar 2010
    1999 Trans Am

    Wont stay running

    Ok so I have a 99 trans am start up fine gets to operating temp and the engine starts sputtering and dies. Sometimes it will fire right back up other times i have to wait several minutes. Anyone have any ideas??

  2. #2
    Member JRENIGAR's Avatar
    Join Date
    Oct 2009

    99 camaro

    water temp sensor??? It goes from closed to open loop and gets pig rich and floods the engine. This would explain why it sometimes takes a min to start back after it dies. After my header install mine was broke and did this until I fixed it.

  3. #3
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006

    2000 WS6 6spd Hooker LT

    First thing to check is fuel pressure. Pumps can get weak when hot. An easy check. Should be 55-60 PSI key on engine off, I believe. Should come right up to pressure quickly, for 2 seconds, then the pump shuts off when you do the initial key on. To check again, turn the key off, then turn it to on without starting the engine again, as necessary, to check KOEO fuel pressure.

  4. #4
    Member DaddySS's Avatar
    Join Date
    Oct 2005
    Bergen Co. NJ

    2000 Camaro SS Conv.

    If you don't have any codes you need to tell us is it loading up (black smoke, gas smell, etc.) or leaning out - detonation, no black smoke, etc.

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