99% of the time it's a pcv hose, put your hand behind the intake manifold while the car is running and you should be able to feel it. it will be sucked in at the elbow on the manifold, this is not an easy hose to replace.
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Re: mazda mpv 2005 vacum leak
U can look for a loose or unplugged hose, try to track it down by listening to determine where it's coming from-use a towel or rag to cover areas it sounds like the vac leak is coming from, if the sound lessens, u are probably close, as the towel/rag are covering and muffling it, so you can look more carefully in that particular area.
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The vacuum leak is not from the transmission, there are no vacuum lines hooked to the transmission it is fully electronically controlled. As far as the fluid goes is the transmission overfilled? Does it operate normally? To check the source of the vacuum leak get a can of Carburetor spray and spray it around the noise, when you hear a loud sucking noise and the engine slows down struggles and starts to stall then you found the leak.
I'd pull the "idle air control valve " (located on side of throttle body near front) off, and use some throttle body spray cleaner on it & the port it came out of. Spray pintle (pointed part) good to remove any gunk etc. Re-install, it & try it. if it cures your problem for a while & starts to act up again, replace it.
posibly he has a vaccum leak and somesome saw the o2 rading or the fuel trims. can you hear hissing sounds from the engine area when it's running? on the back of the intake manifold there is a hose that gets soaked with oil and leaks. you may have more than one problem. the IAC valve which is on top of the throttle body may be deffective.
Generally The brake light only indicates the parking brake is on and/or low fluid in level. You are correct that it indicates a vacuum leak recheck ALL vacuum lines you should be able to hear it as well.
use a can of WD-40 and spray it on the vacum lines and around the intakemanifold when the engine is hot and running. This will cause the engine to rev up when it is sprayed on the vacuum leak. be sure that the engine is at operating temperature as this is when the vacuum lines and gaskets tend to fail.