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high-pitched whining noise during acceleration and deceleration S60

posted by  cetaphil on  Sat Mar 27 23:40 CST 2004
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I've been driving the Volvo S60 2.0T LPT (light-pressure turbo) for 2.5 years now.

Recently for the past few days, I notice that whenever I start driving and depressing the accelerator pedal, a strange high-pitched whining sound (sometimes sounds like a siren) appears. This is different from the usual rumbling low-pitched engine sound. This high-pitched sound gets louder and more high-pitched when I depress the accelerator pedal more; it becomes softer and less high-pitched, then disappears when I release the pedal. If the car is stationary and the gear is put to "P" and not "D", the high-pitched sound does not appear when I depress the accelerator pedal.

The service consultanat at the Volvo dealer said that this high-pitched sound is due to the turbo or turbine engine - wear and tear is the given reason. There is no way to remedy the sound unless the whole turbo is replaced, which costs me few thousand dollars.

However, I've asked around in the internet from various sources and reasons given for the whining sound include intake hose, muffler, turbo bearings, exhaust pipe, intake plenum - all possible causes for turbo noise. But a transmission problem due to worn out pinion bearings, or a worn out crank pulley or idler pulley are possible reasons cited as well.

Is this high-pitched sound really due to the turbo? Or is it due to transmission, or something else? Does that mean that cars with no turbo will not have this problem and those with turbo will definitely experience this after few years due to wear and tear? How to remedy this problem?

Can anyone help?
Deeply appreciated.
Thanks.

Regards. Cetaphil







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    high-pitched whining noise during acceleration and deceleration S60

    posted by  Stickman the Brickman on  Sun Dec 9 10:24 CST 2018
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    last visit: Wed Oct 1 15:09 CST 2014
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    I had a similar issue with my 2004 S60 non turbo- it has an "air box" part of the pollution control system that became clogged with gunk. It was actually creating enough pressure in the motor to push out oil through 2 of the oil seals. These cars don't have PVC valves. It is worth a try to trace the air intake hoses to the intake manifold/ injector system and see what you come up with.
    Greg
    --
    Greg Caggia '93 240, '93 940 & '04 S60








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    high-pitched whining noise during acceleration and deceleration S60

    posted by  KlausC on  Sun Aug 26 10:32 CST 2018
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    last visit: Fri Oct 24 10:15 CST 2014
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    It could be the turbo, my 850 with the HPT does make a high pitched sound whenever the boost is up. You will notice that there is no boost with the car in P or D, and, with no noise, you can rule out the idle rollers or the air intake. The extreme speed of the turbo, 100,000 rpm can cause your issue and is not to be worried about.

    --
    Keeping it running is better than buying new








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    high-pitched whining noise during acceleration and deceleration S60

    posted by  someone claiming to be David on  Sat Aug 25 20:29 CST 2018 [RELATED]

    Call this "a shot in the dark" - My 93 850 (non-turbo) had high pitched sound above 10 mph, like a tea kettle whistle. It went away when the throttle was released. Turned out to be a front wheel bearing was worn. Replaced bearing and the noise was gone.








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    high-pitched whining noise during acceleration and deceleration S60

    posted by  someone claiming to be Stormin Norman on  Mon Mar 29 07:14 CST 2004 [RELATED]

    I often wonder, do dealer service personell think all members of the public are morons due to on the job training or are they born that way.....


    But I digress. If you don't hear the noise when the tranny is in Park, it is not turbo noise! It is hard to believe the guys in the shop didn't ask about such a simple test. Look elsewhere in the drive train, it ain't the motor.








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      high-pitched whining noise during acceleration and deceleration S60

      posted by  someone claiming to be David on  Sat Aug 25 19:01 CST 2018 [RELATED]

      Call this "a shot in the dark" - My 93 850 (non-turbo) had high pitched sound above 10 mph, like a tea kettle whistle. It went away when the throttle was released. Turned out to be a front wheel bearing was worn. Replaced bearing and the noise was gone.







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