• intake manifold gasket (GM3800) gone bad then good?

    From Kyle Einarsson@21:1/5 to All on Tue Nov 23 17:10:57 2021
    L26 engine, low mileage, but 15 years old:
    When starting in the morning, misfires and spews out white smoke.
    Pulling off spark plug leads, it appears that the cylinders 5 and 6 are
    the guilty ones. But once the temperature guage reaches 1/4, the smoke
    stops and it runs smoothly. So the white smoke usually means coolant
    from a buggered gasket. Intake manifold gaskets are a common failure on
    old GM3800 engines. But why only part-time problem? Is it possible that
    when the engine is hot, the gap in the gasket is closed?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Scott Dorsey@21:1/5 to kyle@nopussy.net on Tue Nov 23 22:43:39 2021
    Kyle Einarsson <kyle@nopussy.net> wrote:
    L26 engine, low mileage, but 15 years old:
    When starting in the morning, misfires and spews out white smoke.
    Pulling off spark plug leads, it appears that the cylinders 5 and 6 are
    the guilty ones. But once the temperature guage reaches 1/4, the smoke
    stops and it runs smoothly. So the white smoke usually means coolant
    from a buggered gasket. Intake manifold gaskets are a common failure on
    old GM3800 engines. But why only part-time problem? Is it possible that
    when the engine is hot, the gap in the gasket is closed?

    Could be. Or maybe the block or manifold is cracked. You'll know once
    you have it apart.
    --scott
    --
    "C'est un Nagra. C'est suisse, et tres, tres precis."

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)