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Oil going through PVC valve into air cleaner - Cars & Trucks

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It depends on the mileage, year, make, model and engine size but most of the time it's caused by compression blowing by the piston rings.

Posted on Dec 03, 2012

  • mark14120
    mark14120 Dec 03, 2012

    If you have a compression tester you will want to do a dry and then wet compression test to determine if the problem is with the rings or the valves. if there is a 20lbs/ difference between the two test then its probably the rings. I have used a product called Engine Restore in the past that you add to the oil and had great success at holding off a rebuild for a while.



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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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get the car warmed up and let idle and pull the pvc hose out and watch how much smoke is comming out of the valve cover. then rev it up and see how much comes out. it sure soulnd like blow by to me.

Posted on Sep 11, 2008

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SOURCE: Blueish/gray smoke rough idle and take off

too much oil in crank case

Posted on Jun 20, 2009

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SOURCE: Oil in my air filter case

The rubber grommet on the top of the Rocker cover (valve cover) has a rubber grommet at the back of it may be plugged. You can either replace it or open it up with an awl. it all depends on its condition burnt and melted. If the engine has high mileage, I suggest checking the EGR for clogging and the engine compression. You can try heavy body oil and an engine oil treatment to help reduce the blow by or compression loss on this worn engine.

Posted on Feb 15, 2010

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Pcv valve usually goes from the valve cover to the intake manifold

Posted on Apr 04, 2010

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SOURCE: i have a 97 expedition. idles rough to the point

follow the pvc valve hose to the intake manifold it will be burn on the elbow ....check for intake manifold leaks

Posted on Dec 29, 2010

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Eng was low on oil by 1quart

Add 1 quart.
Look for obvious oil leaks.
Check to see if it is burning oil.... sooty exhaust pipe.
Check PVC valve and where PVC pipe goes into manifold or air cleaner for excess oil.
Depending on age of engine and time between checks for oil level, this may not be excessive.

Mar 16, 2015 | Cars & Trucks

3 Answers

How do i fix an oil leak?

some plugs go down inside the rocker cover . when replacing plugs in this situation it is necessary to replace the "O" ring seals as well as the plugs as the oil from the rocker cover will leak out and get around the plugs.

Dec 20, 2014 | 2001 Kia Spectra

1 Answer

Oil on air filter

pvc valve in valve cover is stick open and sucking oil sprayed into it and into the air cleaner.. replace pvc valve..

Dec 31, 2013 | Cars & Trucks

1 Answer

My 2000 chevy cavalier 2.2 4 cylnder has an high amount of back pressure in the crankcase ,if u pull of the oil filler cap with motor running it spits oil out and what seems like smoke ,it doesnt run hot...

check the PCV valve, If its plugged you'll get the same results, most back pressure in motors of any type is oil pump, defective check valve in the filter section , try this, remove the PVC valve and the oil cap at the same time and block the vacuum line to the PVC hose, this eliminates the PCV system, and see if that reduces the back pressure, the only other thing it could be is bad rings ( just a note, did you recently start using synthetic oil ?)

Jul 03, 2011 | 2000 Chevrolet Cavalier

1 Answer

1992 ford f150 302 engine. Oil is leaking in to air filter which means it is coming from the air intake from the engine. Air filter is soaked and dripping to the ground. Any ideas on what is might be??

It is more likely that the oil is coming into the air cleaner by way of the CrankCase Vent.
There should be a tube that goes from one of the Valve Covers directly to the Air Cleaner.

Inside the AirCleaner Housing, there is the Air Filter, but there should also be a much smaller filter, sort of held in a little box, where the tube from the valve cover comes in.

This condition usually manifests when the vehicle has very high miles. It is caused by excessive BlowBy in the cylinders to the CrankCase. It will help to Change the Positive CrankCase Ventilation Valve. If it is plugged, it will make the situation worse. So, get a new PVC valve, and that is about all you can do, except to keep the air cleaner new, and the oil topped off.

Jun 25, 2011 | 1992 Ford F150 SuperCab

1 Answer

How can I identifies the PCV valve in the motor, where is ti??? and how can I chenge it???

The pvc valve will be located on the valve cover. Or better yet will be inserted into the valve cover. Follow the hoses coming from your air cleaner ( air filter) to the one that goes to your valve cover. Your pvc valve will be at the end of the hose. pvc valve can be tested by pulling it out of the valve cover while still attached to the hose. Start the engine. Place your finger over the pvc valve and pug it with your finger. If you feel vacume then it is working properly. If no vacume is present. Replace pvc valve

Mar 25, 2010 | 2005 Jeep Liberty

2 Answers

2001 saturn with a 2.2 has oil coming from breather on top of valve cover causing it to puddle in air intake.Also have noticed odd noises coming from valve cover area.I had the engine running and removed...

pvc .valve could be defective or Eng worn out hope it is the first replace pvc. you can tell how thee engine is by having a wet & dry compression check done

Mar 12, 2010 | Saturn SL Cars & Trucks

1 Answer

When i press accelerator engine is cutting ....

The van may just need a good tune up.

  • Replace the fuel filter
  • Replace the air filter
  • Replace the PVC valve
  • Replace Engine oil and filter
  • Replace the Spark plugs
  • Clean out the Throttle body with throttle body cleaner
  • Clean out the MAF sensor
This should help you get your van running 100% soon. If your on a tight budget, start with Cleaning the throttle body with spraying throttle body cleaner into the throttle body and cleaning up the MAF sensor with MAF sensor cleaner, just follow the instruction on the can. Then replace the PVC valve and add fuel injector cleaner in to the gas tank. This should help your engine running better and then you can do the rest of the work to complete the tune up. Good luck and keep me posted. If you go to Auto Zone, you can get all the things you need and they can scan your van for any DTC codes that may also indicate what issues your engine has.

Oct 22, 2009 | 1994 Pontiac Trans Sport

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