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  1. #1
    Junior Member
    Join Date
    Jul 2011
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    4

    Oil blowing from PCV valve and filler cap

    I have a 4.2L 258 and I have oil blowing from the PCV valve and the filler cap. Does anyone know what I can do, or oil additives an option. The motor has 165,000 miles. Any advise will be great.

  2. #2
    Junior Member
    Join Date
    Jul 2011
    Posts
    4
    its called blow by. Mine does it too....Make sure the grommets on them are good(not cracked and a tight fit.) also check your oil filler cap that its very tight and secure. While the motor is running unplug your pcv valve and if you feel good suction immediatly on your thumb the valve is good. Mainly engines experience blow by when they are getting worn out and the pistons dont seal all the way. I have it to and its a pain smelling it and it leaking but itll have to do until I get that rebuild kit. Best of luck.

  3. #3
    Junior Member
    Join Date
    Jul 2011
    Posts
    4
    yeah it really depends how bad it is. Did it just start? Is there so much smoke that your fumigating the road? If its livable then keep going but understand that its part of normal wear and tear. I had significant piston damage from overheating and now I'm installing a crate engine.

  4. #4
    Junior Member
    Join Date
    Jul 2011
    Posts
    5
    Make sure your PCV valve is working, check the hoses for damage. Also make sure that the hose at the rear of the valve cover is not clogged with anything. If pressure builds up inside the crankcase, it will blow oil all over

  5. #5
    Junior Member
    Join Date
    Jul 2011
    Posts
    5
    mine built some pressure up about a week ago and today was the first day ive drove it since. I was leaking so many places! Its good now though and did some wheeling today with no leaking!

  6. #6
    Junior Member
    Join Date
    Jul 2011
    Posts
    5
    mine too i just put a little peace of rag in side the air breather by the hose , keeps it clean and you dont smell it. thats just a jeep mine only has 71000 miles on it JEEP just emty every pocket.


 

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