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2001 nissan altima engine noise

Engine making a hissing sound when running. When engine turned off noise stop. noise sounds like tire air pressure leak. Any idea where this noise is coming from or why it is occurring?

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  • gdaddychip Jul 23, 2013

    Is this expensive to fix?

  •  Stephen
    Stephen Jul 23, 2013

    Tough to say until you find the source of the leak. Chances are its a hose but it could be the intake gasket.

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  • Cars & Trucks Master
  • 21,873 Answers

Sounds like a basic vac leak.
You should be able to take a piece of heater hose or the hose from a vac cleaner and listen around the engine compartment for the leak.

Posted on Jul 23, 2013

Testimonial: "Thanx for your response. When I am attempting to listen through this hose does the engine need to be running? and am i looking at alot of money to fix this. My wife needs the car to get to work."

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I have a 2005 Pontiac that makes a hissing noise underneath the car. you can turn the car ignition on without fully starting car and it still makes hissing noise then stops.HELP!!!!!


There is a distinct sound that has a hissing component when you first turn on the key. It will last a second or two when the key is turned to the run position. When the engine started the sound will return and continue to produce the noise so long as the engine is running.

A relatively low noise is normal. If you are concerned check other like cars for the loudness level.

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The pressure regulator on the fuel rail can also produce a sound when the fuel pump is running. The regulator is under the hood and any reasonable noise would not be a concern, A clicking sound is also normal throughout the fuel system when the engine is running created by the fuel injectors cycling.

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The Cat Converter mat be almost blocked ,this can cause this fault. To Check place your hand close to the tail pipe end, a blocked exhaust will make a hissing sound and a continuous pressure will be felt. On a good system you will feel a short pulse as each cylinder fires. The Hiss and pressure will increase with engine speed on a blocked system

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Tire leak hissing sound heard under hood from engine


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I have a 2001 nissan altima and sometimes my car wont go over 60mph would that b gas filter issue or mass air flow sensor


If the gas filter is due, I would replace it as a matter of course. The mass air flow sensor is a possibility...try leaving the mass air flow sensor wire harness unplugged to see if the car runs better. If it does, probably it is bad. However, I would also check the exhaust for a restriction (eg. cat converter could be plugging up), one way to check that is to hook a vacuum gauge to the engine to see if you get normal values. (vacuum should hold steady @ about 20 Hg with engine at 2500-3000 RPM, with no fluttering or drop-off). Also, ensure that all your vacuum hoses are good, and that there are no vacuum leaks (leaks will make a hissing noise).

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Noise running altima 2003


Sounds like you may have a wheel bearing issue based on your description. Could also be a backing plate contacting the brake rotor, but that would be a higher sounding "tinny" noise. This should be easy to determine. Jack up the rear of the vehicle and check each wheel while spinning by hand for the noise.

Nissan SCOPE Certified Technician with 12+ years experience in a Nissan dealership.

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Sounds to me like you need the alternator idler pulley. Look at it and see if it has a big washer covering portion of the pulley, or if the washer is inside the pulley. If its inside, than you have an old pulley. Replace it with the one, that has the big washer in the middle of pulley. You do have another idler for the A/C compressor. Those I have seen fail also. But 80% of the time its the alternator idler pulley.

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