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944S - Whistling sound

Any idea what might be causing a whistling sound in my 87 944S? Intensity varies with engine speed and throttle position.

Old 07-20-2013, 05:09 AM
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Frankly my dear....
 
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Hi DJ, is the sound present when driving and/or stationary?

Is it coming from the front of the engine or around the intake assemblies?

If you could provide a bit more detail I am sure some advice will be offered up!

Of course, it could be that your car is simply happy and feels the need to whistle!
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Old 07-20-2013, 07:53 AM
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Quote:
Originally Posted by rhett View Post
Hi DJ, is the sound present when driving and/or stationary?

Is it coming from the front of the engine or around the intake assemblies?

If you could provide a bit more detail I am sure some advice will be offered up!

Of course, it could be that your car is simply happy and feels the need to whistle!
The noise is both moving and stationary but seems more pronounced when moving.

Hard to say where it comes from other than the engine compartment. It is most noticeable when driving along a concrete curb that reflects the sound back to the driver. Same intensity either left or right side. More intense when on the gas. It is harder to detect when the car is not moving.
Old 07-20-2013, 08:21 AM
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Could it be a high pitched vibration?
Old 07-20-2013, 10:11 AM
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My bet is your cam roller is going bad...they sound whistle-like...a high pitched sound that you can hear from the front.

When were the rollers and belts last done?
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Old 07-20-2013, 11:50 AM
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Frankly my dear....
 
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OK, if the noise is present when both moving or stationary that excludes brakes binding, wheel bearings, etc. However, it could be a bearing on its way out, such as water pump, alternator, power steering pump. Rick mentioned the cam belt rollers..on an S there are three. The main tensioner roller, the standard idler opposite the water pump guide and a further single idler tucked in behind the spring tensioner. Could be any of those, or of course the balance belt tensioner and idler rollers.

Best bet is to take off the belt cover and have a good listen.

Does it happen when the engine is cold i.e. straight away after starting, or does it progressively start and get more pronounced?

Good luck tracking this down...
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Porsche - accept no substitute
Blue 1999 Boxster - Brief encounter! Black 1988 944S - Ongoing project
Black 1987 944S - Gone but not forgotten
Metallic Black 1980 924 - Those were the days....
Red 1979 924 - Hmm Minerva blue 1979 924 - Where it all began!
Old 07-20-2013, 01:41 PM
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I don't hear the noise when the car is parked and the engine is revved. It seems throttle dependent more than revs or speed, so could it be an intake issue?


Last edited by djnolan; 07-20-2013 at 01:59 PM..
Old 07-20-2013, 01:44 PM
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