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PCV valve diaphragm broken - Mazda Cars & Trucks

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  • Jo1234
    Jo1234 Oct 22, 2013

    I have a 2008 Diesel Mazda 2. Am told that PCV breather valve needs replacing, as diaphragm is broken. I have called 2 dealerships and they haven't heard of this valve, nor think they've ever seen one broken on a Mazda and part doesn't exist on a diesel?

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Replace the PCV valve.

Posted on Oct 22, 2013

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Would a bad pvc valve cause gas to get in your oil


Unlikely a bad pcv valve would allow fuel to get in the oil.

Most likely on earlier engines the carburettor is flooding or the fuel pump diaphragm is punctured.

With later engines a likely cause is at least one dribbling fuel injector.

Jan 21, 2017 | Cars & Trucks

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Hi, I have a 2004 BMW X3 3.0L & have pulled four codes;


Check PCV valving to the intake manifold most often the diaphragm is broken which allows extreme vacuum to be applied to the crankcase.Will cause many codes relating to lean fuel mixture bad map readings fuel trims way off. With the engine idling remove the oil fill cap and note the vacuum. It should be very slight.;almost undetectable. I know there are specs relation to in/hg but if you don't have the tester the spec is unusable. Replacing the valve is difficult/expensive. I have replaced many and they never get easier.

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1 Answer

Gmc savana 2002 has lot air front oil cap


the PCV valve may be fine but what about the hose . It cab ne blocked up . Is the PCV valve connected up right . It is a one way valve and opens under vacuum ( when the engine is overrunning the throttle ). The extra air from the filler cap is an indication of excessive blow by in the combustion chambers past faulty/ worn/ broken rings.

Mar 28, 2014 | 2002 GMC Savana

1 Answer

1998 Chevy Malibu is using excessive oil. Had an oil change done back in October 2012 . Then checked Oil level in December of 2012 and was about 3/4 low in oil! why ?


first thing check make sure oil pan drain plug tight. check make sure oil filter tight. try tighten oil filter by hand see if turn tighten oil filter clockwise direcction if all is good. how many miles on vechicle.could have oil leaks park vechicle in spot that clean.move vechicle see if you see oil spots on ground if yes.your front timing cover seal leaking oil or rear main oil seal ;eaking.or valve cover gaskets leaking.if find no oil leaks more likely engine burning oil.replace pcv valve.check air filter if you see oil in air filter housing either have bad pcv valve or pcv not getting vacuum make sure pcv valve getting vacuum when engine running vacuum should be felt at pcv if not pcv valve bad or pcv hose disconnected broken or plugged.if pcv valve okay engine has worn piston rings.worn valve seals or guides or oil return holes stopped up thats all possible reasons for engine burning oil.if spark plugs oil fouled engine burning oil.

Jan 11, 2013 | 1998 Chevrolet Malibu

1 Answer

Burn oil after a long trip


engine burning oil could have worn piston rings.worn valve stem seals or engine oil return holes stopped up.could have faulty pcv valve.make sure pcv getting vacuum remove pcv while engine running should feel vacuum if not pcv faulty or pcv vacuum hose disconnect or broken.check where you park your vechicle if you see oil spots engine has leaking pan gasket,valve cover gaskets could be leaking oil and the front crankshaft seal or rear main seal could be leaking oil.check make sure oil filter hand tight and check oil pan drain plug make sure its tight.

Dec 28, 2012 | 1998 Ford Windstar

3 Answers

Why is oil blowing into my air filter housing?


could have bad pcv valve check and see if pcv getting vacuum take thumb see can you feel vacuum suction with engine running if no pcv valve bad or not getting vacuum check make sure pcv valve hose is not disconnect or broken is so replace vacuum hose.if pcv valve good and getting vacuum.problem could be your piston rings and oil control rings worn out or has too much oil in crank case.

Dec 27, 2012 | Cars & Trucks

1 Answer

Oil is disappering with no leaks please help me


ENGINE BURNING OIL MORE LIKELY.CHECK SPARK PLUGS IF THEY LOOK LIKE THEY HAVE OIL DEPOSIT ON THEM.YOUR ENGINE HAS WORN PISTON RINGS AND WORN VALVE GUIDES WORN VALVE SEALS.ALSO CHECK PCV VALVE MAKE ITS GETTING VACUUM.YOU SHOULD GET SUCTION AT PCV VALVE WHEN YOU REMOVE IT FROM VALVE COVER PLACE THUMB AGAINST VALVE SHOULD BE VACUUM COMING FROM IT.IF NOT LOOK FOR DISCONNECTED, LOOSE OR BROKEN VACUUM LINE AT THE INTAKE MANIFOLD FEEDING THE PCV VALVE HOSE.

May 13, 2011 | 2002 Cadillac Deville

1 Answer

I have changed everything: Spark plugs, Wires, Coil Packs, Ignition Control Module, Air Idle Control Valve, Throttle Position Sensor, Map Sensor, Cleaned out my PCV valve. My EGR Valve is in great shape so...


There are three components that will enrich the fuel mix: 1)engine coolant temperature sensor. If this is not working or the signal is interrupted by a wire breakage then the engine will run rich. The coolant sensor informs the ECU (high resistance) that the engine is cold at start up and so the ECU responds by increasing the fuel injection cycle to enrich the fuel air mix. Later on as the engine warms the resistance of the coolant sensor drops and the injection cycle is reduced by the ECU. If the sensor is faulty or has become disconnected (wire break or corrosion of the socket pins) the ECU assumes that the engine remains 'cold' and the engine runs permanently rich. 2) O2 sensor, operates completely independently of the EGR, if it is faulty and signals 'too much oxygen' then the ECU will significantly enrich the fuel mix to try and balance what it thinks is an excess of air. 3) Fuel pressure regulator. If the diaphragm has broken or there is a leak in the vacuum line this will result in higher than needed fuel pressure in the fuel rail at idle. The vacuum line acts against the spring pressure holding the valve closed. At idle, the inlet vacuum pulls back on the diaphragm reducing the fuel pressure required to open the valve. Low fuel pressure coupled with short duration injection times will mean a lean mix at idle. If the vacuum is compromised or the diaphragm damaged then the increase in rail pressure will make the fuel mix very rich to point of flooding the engine

Nov 02, 2010 | 1993 Isuzu Trooper

1 Answer

I have 1994 wrangler I am getting alot of oil in the air filter. Is it a bad pcv valve?


You may be right about a bad pcv valve i would start by replacing that, also theres been problems with the tubing for the pcv system, this contains a bunch of tubes a (plastic) that connect to the valve cover and air box and the intake this system gets blocked or restricted, and sometimes the hoses break so make sure its not broken or plugged,start with these tips, hope this helps.

Oct 24, 2010 | 1994 Jeep Wrangler

1 Answer

How to fix a 2000 mercury cougar with a cumputer code reading fuel trim too lean (bank2)


POSSBLE CAUSES FOR LEAN FUEL TRIM.STOPPED UP FUEL FILTER OR STOPPED UP FUEL INJECTORS.WEAK FAULTY FUEL PUMP.FUEL PRESSURE SHOULD BE 37 - 41 PSI.YOU COULD HAVE AIR LEAKS AFTER THE MAF SENSOR OR LEAKS IN THE PCV SYSTEM.CHECK FOR A EXHAUST LEAK NEAR THE OXYGEN SENSOR.LEAKING EGR VALVE GASKET OR VALVE DIAPHRAGM.MAF SENSOR DIRTY.UPSETTING AIRFLOW CONFUSING THE PCM.

Oct 09, 2010 | 2000 Mercury Cougar

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