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Join Date: Jun 2004
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Exclamation Hissing sound when engine running - even at idle..

I seem to have a "hissing" sound coming (not loud) from the 944 when I drive it, and still when I idle. It is difficult to tell where it is coming from.. sounds like it may be underneath the car.

I have noticed that the car smokes a little more than normal from the exhaust.. I'm pretty sure it's not a broken hose as most of them they have been checked/replaced recently.

Any ideas? Could this be a transmission issue perhaps?
Old 04-06-2005, 04:40 PM
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Vacuum leak?

Balance belts normal whine?

Are you having any other symptoms or just the hiss?
If your idle is high (over 950) it is probably the vacuum
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83 944 white w/Boxster wheels
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Old 04-06-2005, 04:45 PM
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AHH, I hate noises like that, I still am trying to find a hissing metalic rattle that only happens on decel, I have been chasing it for 2 years. Good luck. It might be a heat sheild or a exhaust leak
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1986 951, Stock for now.
]87 924S Gaurds red- SOLD after 11 years of ownership
Old 04-06-2005, 05:13 PM
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Everything else seems ok.. but when I drive down the road I don't sound a smooth porsche!

It's loud as in you don't hear it in traffic or busy area, but if you drive down a quiet residential street it is quite noticeable.. (oustide the car).

What's the "balance belts normal whine?"
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'87 944 - Champagne - Always a celebration!
Old 04-06-2005, 05:17 PM
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Kinda sounds like a light supercharger wine
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1986 951, Stock for now.
]87 924S Gaurds red- SOLD after 11 years of ownership
Old 04-06-2005, 05:25 PM
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Well, it's not a turbo..?
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'87 944 - Champagne - Always a celebration!
Old 04-06-2005, 05:26 PM
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