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Have oil coming out of pcv valve.what would the cause be

Posted by ken i on


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ray gallant

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  • Cars & Trucks Master
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Bad rings called blow by

Posted on Feb 18, 2020


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  • 463 Answers

SOURCE: My 2000 Daewoo Nubira leaks oil from engine

I would think that if the PCV valve were actually plugged, there may be enough pressure build-up to unseat the thing, which would cause most oil leaking from crankcase pressure to exit via the hole left where the PCV was. Just a guess. How many miles on this Nubira?

Posted on Feb 27, 2009



  • 146 Answers

SOURCE: I have a 1991 jeep wrangler.Getting motor oil in

Yes there is a PCV valve, you just have to look for it.
Engine may be over full on oil.

Posted on Jan 04, 2010

Testimonial: "Thank you very much.I will look for the valve."

Mel Craven

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SOURCE: Leaking oil - PCV valve?

Oil won't cause, PCV could.

Posted on Jan 16, 2010


  • 47 Answers

SOURCE: positive ventilation crank case valve location

I have one of these cars too, also 3.5. I purchased with 34K and has used a quart of oil every 1000 miles since then. It has no leaks or smoke or any other signs of oil consumption. So much research, nobody knows why these engines do this, some have gone as far as contacting Chrysler just for them to say, " that's normal". But here is the diagram for the PCV:


Posted on Mar 13, 2010


Alexander Mimun

  • 3092 Answers

SOURCE: I have a an oil fouled plug at cylinder 7 just

No it's either bad piston ring's or bad valve seals, the PCV ( positive crankcase ventilation ) only job is to reduce the air pressure in the crank case, so that it don't get moister in the crankcase like an air compressor.

Posted on Jun 07, 2010

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2 Answers

Where is the PCV valve located on a 1988 ford ranger 2.0L?

The PCV valve is under the intake on the left (drivers side) above the block. It looks like this.
pcv valve-vpddmisrgqiwixpzyd1d3rna-4-0.pngIts hard to give a proper diagnosis without photos of the leak. The best thing to do is to clean up the area as much as possible and run it till it leaks. Then you should be able to see where its coming from.

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99 Chevy Malibu 2.4 engine. I check my air mass sensor and it was covered with oil and I see that I had oil in the combustion chamber. How to get out oil

Oil is coming from pcv or breather pipe. You probably have excessive piston ring wear causing blowby and forcing combustion gasses up the engine and into the breather and pcv system. Oil will come with the gasses if not filtered out. Check the pcv valve for proper operation and check any breather cap for baffles to keep the oil in the valve covers. Also consider getting an engine rebuild, if you want to keep the car.

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Sounds like your pcv valve is clogged causing the oil to back up.Here's a link on how to replace. Repair Guides Routine Maintenance And Tune up Positive Crankcase... Here's the part,and it's easy to do. AZ Filters PCV Valve PCV1142DL 1990 Nissan Datsun Pulsar 4 Cylinders 1...

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Engine is blowin oil out the fill cap on the valve cover on 2000 dodge 1500

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One of my gaskets is broken and I'm leaking oil its not the valve cover or head or oil pan which other gasket is there?

Well there is the intake. And if your running your car with a bad PCV valve you will have pressure building up and oil will spray making it look like its coming from somewhere else rather than the Valve covers. I would replace the PCV valve first and power wash the engine and replace the valve cover gaskets.
Please leave a good feedback on here for me.

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I have found engine oil in the throttle body on 1994 toyota tercel

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Oil in air filter wot causes this car in qustion is a jag xj8

This issue is caused by crankcase pressure issue.
Normally filtered air enters the engine, runs through the crank case and then is pulled into the intake through the PCV valve. Durning hard acceleration, the PCV valve closes (to prevent explosion of fumes in crank case and blowing valve covers and pan off) and the PCV system reverses, with fumes coming back through the filtered intake.

Usually there is minimal oil that gets back into the air cleaner.

So, when somthing goes wrong, like excessive blow by, for example, the crankcase pressure overcomes the PCV valve and intake of fumes capability, and oily starts showing up in the air filter.

Investigate the crankcase pressure and PCV system.

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Could that be causing oil in intake and exhaust

Look at center of engine, at back, and you'll see a black tube coming from drivers side rocker cover, to a short black piece of rubber hose like a 90 degree elbow (which usually cracks or collapses and causes problems).
That should attach to your PCV valve.

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Leaking oil - PCV valve?

Oil won't cause, PCV could.

Jan 16, 2010 | 2000 BMW 5 Series

1 Answer

My 2000 Daewoo Nubira leaks oil from engine

I would think that if the PCV valve were actually plugged, there may be enough pressure build-up to unseat the thing, which would cause most oil leaking from crankcase pressure to exit via the hole left where the PCV was. Just a guess. How many miles on this Nubira?

Feb 27, 2009 | 2000 Jeep Grand Cherokee

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