Question about 1986 Chevrolet Camaro

2 Answers

Still having oil coming out of distick

Ive changed the pcv and it still is coming out of dipstick...what else should i look at?

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  • beacham88 Apr 12, 2009

    what is a piston crown?

  • beacham88 Apr 12, 2009

    wouldnt it smoke real bad out of the exhaust?

  • beacham88 Apr 12, 2009

    pcv is fine,oil pressure is alittle above 30.....this started when i found my check valves were clogged...so i took it for a drive down the street and back to clear out what was probly held up in hoses before i put on the new ones...was this a bad thing?

  • beacham88 Apr 12, 2009

    2 of them one on each side running from the AIR pump at the exhaust manifolds...plus why does the oil only come out when im drivig and not when idling and reving up the engine?

  • beacham88 Apr 13, 2009

    tell me about it....everytime i do something new to fix, something else happens...when i bought ,it the AIR pump was locked up..so i put on a new one...i was planning on rebuilding the engine, but not this soon,i rebuilt the 307 in my oldsmobile,so i know i can rebuild this one...its a 305 fuel injection ..id like to get it to pass emissions first...the nox and hc keeps failing....if i put a new catalyistic convertor on it....will it help..even if co is fine?

  • yadayada
    yadayada May 11, 2010

    a burned piston crown.

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  • Master
  • 1,050 Answers

Whenever you have excessive pressure in the crankcase, it's usually a sign of severe engine wear. Typically piston rings that are no longer sealing well and combustion pressure is "blowing by" into the oil pan pushing oil and vapor out of the engine wherever it can. It's time to rebuild the engine.

Posted on Apr 12, 2009

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  • Dave  C
    Dave C Apr 12, 2009

    There are three piston rings on each piston. The top two are compression and the bottom ring is a 3 piece combination ring that is designed to scrape oil off the cylinder wall and back into the pan. You can have one or more broken compression rings that will cause a tremendous amount of blow by but surprisingly not oil consumption. Usually a rough idle is also a good indication that you have compression ring problems.

  • Dave  C
    Dave C Apr 12, 2009

    What do you mean by check valves?

  • Dave  C
    Dave C Apr 12, 2009

    There is very little air entering the engine at idle or free reving. When the engine is under load, the throttle plate is wide open, or at least a lot further open and there is a huge increase in combustion gases and cylinder pressure, hence, more blow by. As far as why this started when you changed the check valves, I have no idea without seeing the install. It is possible you have some bizarre plumbing mix up that could be causing problems but I can't see how. Try disconnecting the tubing from the air pump and driving it, if this helps, you really have a strange problem with the air injection system.

  • Dave  C
    Dave C Apr 13, 2009

    Hey, my rating went down :-) I'm standing by my 1st response but if you want more info, you shouldn't bite the hand that feeds you.
    If you want to pass the test without the new cat, you may have a fighting chance if you drop the base timing down 8 degrees just for the test. but It's not legal to do so.

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  • Chevrolet Master
  • 76,682 Answers

The piston crown is part of the engine piston, a V8 has 8 and so on..

Posted on Apr 12, 2009

  • yadayada
    yadayada Apr 12, 2009

    not always, u have excessive crankcase pressure, if the PCV is functional and u say it is, then that is the only explanation, bad piston(s) or piston rings. Are u 100% sure the PCV is not plugged or has no vacuum due to a collapsed vacuum hose? recheck it.

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Also, please rate via the helpful button if you feel my answer helped you out. Also post back and let me know if this cured it.

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Oil coming out of dipstick


What engine? The oil level is good, not to high? If yes, it has too much crankcase pressure. Change the PCV valve and check the crankcase air filter. Also make sure you have vacuum at the PCV.

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