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How do I check a vacuum leak PVC valve and the hoses?

I have a really loud squeak while driving and it's driving me crazy and I need to fix it ASAP

Posted by Anonymous on

  • graybeard32301 Mar 30, 2015

    Hi Anonymous, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Please post year, make and model.

  • Anonymous Mar 30, 2015

    2002 nissan sentra GXE. My car squeaks from the second I start driving and I hear it coming from the wheels as I drive because the faster I go the louder it gets and it gets quieter as I slow down.

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1 Answer

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  • Cars & Trucks Expert
  • 244 Answers

On a cold engine you can use carb clean spray it around the hoses and listen for a change

Posted on Mar 30, 2015

  • Anonymous Mar 30, 2015

    Thank you I'll try that out

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: vacuum leak

mine is doing the same, it's your pcv receptor on the manifold. that hard plastic cover is actually part of the intake itself, if it "came off" it would cut your intake in half. that seem seals the two halfs together. you gotta pull the whole intake off and replace it... or jimmy rig it.

Posted on May 16, 2009

lonewolf1996
  • 142 Answers

SOURCE: 1998 Altima GXE has a code of P1491. It was

Code P1491 is not the PVC Valve.It is the Vacuum Cut Valve Bypass Valve.
Which is located above and away from the egr canister under the driver side rear bumper it is round and have about 3 hoses connected to it. if it is from a check engine light that says look at vacume cut valve check the egr canisters purge valve some times they stick and throw the wrong code

Posted on Sep 01, 2009

  • 427 Answers

SOURCE: I need vacuum hose routing diagram for 2001

has a sticker on the underside of hood for vacuum diagram

Posted on Mar 21, 2010

  • 2309 Answers

SOURCE: Purchased a Lincoln Aviator 2 days ago and the

of all the possible causes i would think you have a missfire, probaby plugs, and you can wait a week

Posted on Dec 08, 2010

  • 1 Answer

SOURCE: 1997 ford e250. VAcuum leak from hose going thru

LOSS OF AC WHEN ACCELERATING, e250 ac work

Posted on Jul 06, 2011

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If I understand this, your fan and other belts driving components in the engine bay stop squeaking when stepping on the brake? Your belts may need some adjustment to tighten. But it may be a vacuum hose leaking around the power brake chamber, or it is leaking, and sounds like the squeeking you describe. I would temporarily confirm the belt squeak by using a "Belt dressing spray" from your auto parts store, to see if it really is the belt or a possible vacuum leak. My belts squeak sometimes after the first start of the day in cold weather since the alternator is working very hard to recharge the battery after the start. It will be quieter when the engine is slowed down as in your braking scenario.

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If the 'squeak' is from a car that is standing still open the hood and listen closely. A short hose; siphon hose, garden hose (about 2-3ft. long). Put one end up to your ear and move the other end close to engine. Be careful not to get caught in any moving parts; body parts, clothing, the listening hose you are using. Always be aware of where your body parts are in engine area & well lighted (avoid moving belts & beware of radiator fan starting automatically). You can pin point a squeak accurately...just as a doctor can listen to your lungs and heart with his listening device that works pretty much the same way. This technique works great for finding 'vacuum leaks' or internal mechanical problems; loose valves & which one may need to be adjusted...etc. You don't need to go deaf to all that noise...if it's to loud hold the hose further away from ear where it's comfortable for you to listen.

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The lines going to the PVC are what you would have to remove and check with a Vacuum pump or Vacuum source. Close off one end with your finger and apply Vacuum to the remaining end.
The engine and its cavities produce a Vacuum pressure when the engine is running to draw in vapors from the oil system. Therefore any hose connected directly to the PVC valve will vent through that system so you will need to test the parts off of the engine.
The PVC valve is a cheap part and usually does not break between replacement intervals. Because of the spring valve inside this part, it is to be replaced at intervals just like an air filter.

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I have a 97 mazda mpv and need to find the pvc valve on the engine?


PVC Valves do not need to be replaced
Never have

99% of them, have been on the valve cover
for at least 40 years

Unless you have a pcv vacuum hose leak
they do nothing, as far a your engine goes

They are there to regulate crankcase fume
evacuation

Need to start studying & stop listening
to all the hype,including repair shops that
sell these things for no reason.

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