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Old 08-28-2008, 03:18 AM   #1
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resonance at 200rpm

If I accelerate say in 2nd or 3rd gear and then back off the gas there seems to be a resonance zone as the revs go down thru 2800rpm, is this a normal feature ?
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Old 08-28-2008, 06:33 AM   #2
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Do you have a after market exhaust??
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Old 08-28-2008, 11:37 AM   #3
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Search all P. forums for 3k rpm vibration.

I have this problem too and have tried all recommendations to get rid of it without success.
(motormount, muffler support , new flywheel etc)
Seems like its a built in failure as the shops dont know what to do.
But they all says its harmless. Just irritating
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Old 08-28-2008, 05:09 PM   #4
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My 2001 S with 10,000 miles does not have this issue. Perhaps it's a function of mileage and something that eventually shows up. I tried to replicate the issue but couldn't.

-Steve
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Old 08-28-2008, 08:04 PM   #5
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yeah maybe a function of mileage, its not exhaust related, it just feels like a mechanical resonance its only apparent for a second or so in a narrow rev range around 2800rpm and only does as it decellerates.
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Old 08-29-2008, 03:10 PM   #6
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Do your cars have Vario Cam?





Variable valve timing system Porsche (VARIO CAM)
Advancing the inlet camshaft by means of two sliding chain tensioners, which can be moved to and from via magneto-hydraulic actuation. The exhaust camshaft is driven by the crankshaft. The inlet camshaft is driven by the outlet camshaft via a chain.

Could the resonance your talking about being caused by the cams retarding?
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