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Gas in crankcase oil

Discussion in 'Gearheads' started by fubarjohnnyr, Jan 13, 2018 at 10:19 AM.

  1. fubarjohnnyr

    fubarjohnnyr Sharpshooter

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    My son has an old '94 Caprice Classic with a 4.3L L99 V8 engine. He states there is gas in the oil, anyone got some recommendations as to what I should be looking for here? Stuck injectors, bad pressure regulator, or otherwise?
     
  2. CHenry

    CHenry Sharpshooter

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    Injectors will be the culprit.
     
    Cowcatcher likes this.
  3. KOPBET

    KOPBET Sharpshooter

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    How much gas? Noticeable level change or just smells? How long since last oil change?

    Any other symptoms? Check engine, black smoke, hard start, sputtering, high mileage? Anything?

    You can borrow tools from many parts stores. I would check easy things first. Get a fuel pressure gauge, check pressure while cranking and how long it takes to bleed off. Check cylinder compression and leak down, compare cylinders. Are any or all plugs wet?

    Oh, and change the oil.
     
  4. fubarjohnnyr

    fubarjohnnyr Sharpshooter

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    I haven't personally inspected it yet, but oil change done about 600 miles ago. From what he has told me, noticeable level change on dipstick.
     
  5. MacFromOK

    MacFromOK Sharpshooter

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    If it has a mechanical fuel pump on the block, the diaphragm is probably busted.

    If so, replace fuel pump and change oil & filter.

    This is dangerous btw. I saw a Ford engine once that had fired in the crankcase and blew off both valve covers and the oil pan.
     
    Okie4570 and jrusling like this.

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