Question about 1999 Volvo S70

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Have presure problem in oil blowing back from fill cap under load dosent miss on no load just no power under load. could it be a cloged vent tube of some sort?

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Do a compression test first, that will give you an idea if the engine is still good. it should be between 185 to 213 psi with a maximum difference of 28.4 psi under or over. this sounds like the compression is in the pan and not in the cylinders.

Posted on Jan 21, 2011

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Posted on Jan 02, 2017

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Where is an air vent for transmission for Honda 250


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Oil leaked out from the oil cap and the engine cover has a missing screw


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Blowing back at oil fill is this ok


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I can smell gas in the cab of the windstar van but dont see any leeks but it built up presure when i opened the gas cap


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Check engine light with p0446 code


P0446 Evaporative Emission Control System Vent Control Circuit Malfunction Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
SymptomsThere will be no obvious symptoms to driver, other than MIL illumination.
CausesA code P0446 could mean one or more of the following has happened:
  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Possible SolutionsWith a P0446 OBD-II trouble code, here are some things to try:
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  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

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1 Answer

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4 Answers

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in your car the air ventilation system is freeze up causing a build up of pressure which caused the oil to burst out. there is the mosture sludge build up under the oil fill cap . its advisable to clean everything up and then check out by starting the car. also spray crab cleaner in the throttle body and check out. as per me the problem is causing because of :-- I guess the breather vent tube was full of oil - frozen in there somehow. Must have to do with that sludge buildup on my oil fill cap. This is the one coming off the front on the left side of the oil filter. It goes down under the engine. This blockage caused a pressure buildup in the crankcase which caused oil to blow by the pistons and into the combustion chamber and out into the air intake hose and throttle body. get the spark plugs removed and cleaned up all the oil. The reason it sputter is because of all the oil in the combustion chamber. No air could get in. get the oil change and insulate the breather pipe in case of future freeze ups. This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya

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Ok. Under the hood on the passenger side next to the turbocharger and behind the transmission dipstick and oil fill tube is a round vacuum valve about 2 inches in diameter.It should have a small gray vacuum hose going to it. It probably fell off. Check that first and let me know what happens. Good luck.

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