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Can a pcv valve cause oil pressure to stick when driving

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  • Cars & Trucks Master
  • 3,218 Answers

A positive crankcase valve ( PCV ) has nothing to do with oil pressure. It is for emmissions and removes blowby gases from the engine. What problem are you having?

Posted on Apr 11, 2015

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Posted on Jan 02, 2017

leethedeuce
  • 4472 Answers

SOURCE: 2004 5.3 tahoe, Mobil 1

shouldn't be plugged if you use mobil 1 and have changed regularly. Do you actually see drips/runs anywhere? It could be the valve cover gaskets themselves. Your best bet is to get the factory service manual which will give you everything in detail that is what the dealer mechanics use
http://cgi.ebay.com/ebaymotors/2004-Tahoe-Suburban-Yukon-Chevy-Service-Repair-Manual_W0QQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247QQcategoryZ34216QQihZ025QQitemZ380006789512QQrdZ1QQsspagenameZWD1V
Let me know if you need any further assistance.
Thanks,
Lee

Posted on Jul 18, 2008

SOURCE: 1990 Honda Civic Hatchback, 1.5 EFI, runs great

Did you put Valve seals in the head???
Other than that the PCV is a good start...
But it sounds like the oil rings on the pistons to me.

Posted on Apr 19, 2009

  • 6982 Answers

SOURCE: STOP ENGINE-LOW OIL PRESSURE LIGHT COMES ON AFTER INSTALLING NEW

Before making any repairs I suggest you put an external mechanical oil pressure gauge in place of the sending unit and determine what your actual oil pressure is. That will tell you which way to go using real numbers. If this condition appeared suddenly it may not be a large problem, especially as you did not note any knocking etc that goes along with internal wear.

Posted on Jul 30, 2009

  • 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:

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Posted on Mar 13, 2010

agent91
  • 2100 Answers

SOURCE: 1965 ford 352 engine blows oil out of breather.

I know the 65 didn't come with a 352, what is a 352? I thought it was a 351 windsor,? Anyway, did you rebuild the motor? There is a vent under neath the intake sheet metal that clogs up, It is held in the with a plate and rivets, you either have to remove the rivets or soak the whole thing in solvent. It will upset the car's pcv, a new pcv valve won't hurt, you don't need to be drilling holes, you might make it worse. Check all your vacuum lines. Make sure you have no leaks. Hope this helps.

Posted on Aug 16, 2010

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I removed the oil cap and there was a lot of pressure coming out on my 2002 Chevy trailblazer ltz 4200 is that a major problem and also is there a PCV valve on this motor


First, there is a PCV valve, unless someone removed it.
A local car parts store or garage should be able to tell you where it is located.
Second, a lot of pressure ( usually called "blow-by") can be a problem.
Blow-by that is extreme can blow the oil out of your engine whilst you are driving it, and cause motor failure.
I should recommend you deal with the PCV valve first, and be certain the pipes and or hoses are good to it, as this has a lot to do with blow-by.
Other than the PCV system, blow-by can also be caused by worn rings on the pistons or worn valve guides.
God bless your efforts.

Dec 19, 2016 | Cars & Trucks

1 Answer

Can a blocked pcv cause a oil leak


The upper part of your engine is like a compressor. The lower part is similar, but not to the same degree because there is a lot of room in the lower part of the engine which keep the pressures much lower. Yes, a blocked PCV valve can cause excessive crankcase pressures to build up which can cause oil to leak out of oil seals which are worn and weak. In some cases it can even cause oil leaks on low mileage engines which have no means of venting the crank case pressures. I hope this has helped you. Usually I don't run into too many stopped up PCV valves, just restricted ones and ones which won't close when they are suppose to.Good luck

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Why is oil blowing from dipstick of a 1994 ford excort


Here's a link to the pcv valve,could be glogged up causing pressure to back up,Here's the pcv valve.

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I have a 1998 mitsubishi eclipce rs. My oil dip stick keeps coming unpluged while driving what can couse this to happen.


You probably have a plugged PCV valve , normally located on a valve cover. If it is plugged pressure will build up in the motor. The easiest place for pressure to escape is the dip stick hole.

Jan 11, 2011 | Mitsubishi Eclipse Cars & Trucks

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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.

Oct 14, 2010 | 1998 Jaguar XJ8L

3 Answers

Oil blow back from out of the dip stick, what may be causing this and how to resolve the problem.


Time has come to retire this vehicle to the recycle plant and get yourself a nice new SMALL car thats fuel efficient.Most obvious cause is worn pistons and rings

Oct 23, 2009 | 1989 GMC Suburban

2 Answers

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.

Apr 09, 2009 | 1986 Chevrolet Camaro

1 Answer

Pcv valve poping out


Sounds like high crankcase pressure probably caused by blowby.You didn't say how many miles but rings may be worn enough to allow pressure to pass by them.

Oct 13, 2008 | 1991 Ford LTD Crown Victoria

1 Answer

I have oil blowing out of the air cleaner and the dip stick tube. I allready changed the plugs (non were black)the truck does not smoke out of tilpipe. I disconected the 12v activaded canester on one side...


A clogged PCV valve or EGR valve is what I'd think of - mainly the PCV valve. Replace it along with any hoses that feed it or that it empties into, since if the valve is bad, or sludged up, it's likely that the hoses have a coating of oil sludge inside as well. A bad PCV will cause excess pressure in the crankcase, leading to oil leaks and losses.

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