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Why is my Cpap have whistling noise from machine when I'm exhaling?

I have mask on and exhaling. Noise is coming from machine. A whistling noise only when I exhale.

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Posted on Jan 02, 2017

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SOURCE: Noise when driving at speed Jaguar X type (53 plate)

This problem that your having is all too common on Jaguars. I have a 2002 X-type and I have been completely screwed over with it. I've had all of your problems and then some. The noise your hearing is a prop shaft most likely in the front of the vehicle. Jag says that it doesn't need to be replaced but you always can. They quoted me somewhere close to 1,300. Good Luck.

Posted on Jul 27, 2008

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I have a whistling noise coming from my car, this is only when moving. If I apply the brakes or am at a standstill, even if I rev the engine there is no noise. When I had service I was told my front...


Whistling noise is pretty vague. There are several possibilities. The brakes could be the source of the noise. If they're 85% gone they should be replaced anyhow regardless of whether they are the source of the noise. Otherwise the noise will no longer be your biggest problem. Disc brakes do have what is called a worn pad indicator. This is simply a metal tab that scrapes the brake rotor, making an annoying, scraping noise until the brake pads are replaced.
Other than this, there are several possibilities. Where is the noise originating? Could it be wind noise coming from an ill fitted window seal? Vacuum hoses are another noise source, although they usually only whistle when decelerating or at idle.
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A whistling noise can be generated by an alternator at high RPM's and indicates a slip ring brush problem or a diode failing . It resembles a frequency whistle.. IT may also be from a leaking gasket and a partially blocked exhaust system from a failed cat converter and at speed and power, the exhaust gas is forced out the hole

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Can be the Alternator bearing or a serpentine belt pulley close by. A whistling noise can be a Vacuum leak. Sometimes when installing an Air filter, the ductwork is not reconnected perfectly.

A PCV valve can sometimes make a noise. The spring tension inside the PCV valve should keep it closed until a strong Vacuum pull opens it. This would usually be masked by the other engine noises at higher RPM.

About the only other thing you can do is use a water mist from a spray bottle on the engine seams as it runs. Follow vacuum lines and so on. Water will affect RPM so any openings can be detected.

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Checking Window Seals - The window seals (weather stripping) in your car are used to seal the water and wind for entering the passenger compartment. When these seals fail from damage or are eroded by the weather they can allow wind noise to enter the passenger compartment. This failure can cause a whistling noise as the car is driven. Some noises are only present when the vehicle is driven at certain speeds such as 55 MPH. These whistling noises can be difficult to find since you are driving at the time. Have a passenger help with the diagnosis by running their hand along the area the noise is being generated from. Once the noise source has been located replace or repair the failed seal and recheck.

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Check the protective backing plate for the brakes to see if its bent. Look at the opposite side to get a good idea what it looks like to bend back into shape if so. If bent they will create a noise or whistle effect

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What speed?
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Only in crosswinds? Sometimes the antenna makes a whistle noise in cross winds at 50 plus mph.

Get a roll f 2 inch masking tape, and tape off areas one at a time and test drive.

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There is a vacumn hose that has come loose somehow. Use a second person to isolate the whistle to lead you to where the hose is cracked, loose, or detached. Fix or replace and this should fix this whistling sound. Hope this helps.

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try and look at the belts, if they are wore out replace them

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