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Oil in Spark Plug Wells

Discussion in 'GM Powertrain' started by redmaro, Nov 15, 2007.

  1. redmaro

    redmaro New Member

    I was took out 2 spark plugs on one side of the engine and I noticed some engine oil in my spark plug wells. Any one know where this oil is coming from? And I also noticed some engine oil in my Throttle body. Any one know where its coming from? The valve covers don't seem to be leaking,

    Silverado 1500
    5.3L Vortec
  2. unplugged

    unplugged New Member 1000 Posts

    I'd guess plugged crankcase ventilation. Probably bad pcv valve? Excess pressure can blow out valve cover gaskets.

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