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Old 04-02-2013, 07:39 AM   #1
Pup
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Strange Noise

I have noticed that at 1600-2000 rpms, in gear, moving in any gear, that I hear a howl, moan. It goes away after that rpm range. I have no idea where this may be coming from. It does not appear to be load dependant, but is rpm dependant..

2000 Boxster S 3.2

Any ideas?

bc
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Old 04-02-2013, 07:50 AM   #2
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Have you had the IMS bearing replaced? I read something about moaning at low revs can be advanced warning of an IMSB failure. There are probably other things it could be but this is the most worrying.

On a different note, I had a moan at high revs when I was having fun. Tracked it down to the passenger seat so now I no longer let the wife in.
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Old 04-02-2013, 07:57 AM   #3
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Quote:
Originally Posted by Nimbus117 View Post
....
On a different note, I had a moan at high revs when I was having fun. Tracked it down to the passenger seat so now I no longer let the wife in.
Well done, that's the most effective way to neutralize the wide open throttle alarm.
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Old 04-02-2013, 08:18 AM   #4
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low rpm moan - tell me more

IMS has not been replaced..

Tell me more.... about the low rpm moan issues?

Only occurs when driving "easy" like 1600-2000 rpm, pitch is constant, volume is constant, not loud , no grind, no change in tone/pitch/volume with rpm, just there or not there... Never heard on accelleration, mostly when driving low speed, 30-35 mph... Motor not lugging, no obvious issues. Just annoying and I'd like to make it go away.

Pup

Last edited by Pup; 04-02-2013 at 09:03 AM.
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Old 04-02-2013, 09:48 AM   #5
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Not sure where I read it but it stuck in my mind. Just remember it stating than in rare occasions a moaning at low revs preceeded an IMSB failure.

I dont know if anyone can shed any light or offer alternatives but thought I had better tell you.
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Old 04-02-2013, 11:07 AM   #6
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Yes. Please chime in if you have any info.

PLease chime in if you know anything about this... I may have read something like that but was almost positive there was a vibration associated and that it occurred at start up . This does not. just in the range I stated.

bc
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Old 04-02-2013, 12:03 PM   #7
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When you said it engine speed and not load dependant it made me think of this.

Of course if Porsche had made a left and right hand head instead of a common one, we would never have heard of an IMS.
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