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Strange noise at idle
1987 carrera coupe, 100 cell cat, stock muffler, SW chip. runs great...
For a long time now, I have had this hollow metalic sound at idle. It disappears when revs increase and it reminds me of a water pump sound on water cooled engine cars needing service. I tightened many of apparent vaccum hoses, intakes etc... It might be a natural carrera sound... Any suggestions on getting rid of it? Thanks |
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03-11-2013, 03:03 AM
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Any idea what section of the engine you hear this?
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Sal 1984 911 Carrera Cab M491 (Factory Wide Body) 1975 911S Targa (SOLD) 1964 356SC (SOLD) 1987 Ford Mustang LX 5.0 Convertible |
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03-11-2013, 05:05 AM
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Recreational Mechanic
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Valve adjustment??
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P Cars: 2022 Macan GTS / One empty garage space ---- Other cars: 2019 Golf R 6MT / 2021 F-250 Diesel / 2024 Toyota GR86 6MT ---- Gone: 1997 Spec Boxster Race Car, 2020 GT4, 2004 GT3, 2003 Carrera, 1982 911SC, 2005 Lotus Elise and lots of other non-Porsches PCA National DE Instructor #202106053 / PCA Club Racing / WRL Endurance Racing |
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03-11-2013, 05:09 AM
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Northern Motorhead
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Do you have the same sound when you depress the clutch ?
Cheers ! Phil
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Cheers Phil 89 Coupe,Black,95 3.6 engine and the list goes on ... 1983 944 SP2 race car PCA #96 |
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03-11-2013, 05:38 AM
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Join Date: Jun 2011
Posts: 90
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My 1987 makes the same sound until I rev the motor then it goes away
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03-11-2013, 05:55 AM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
Posts: 3,059
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does it sound somewhat like a kazoo, and is it located near the right side of the engine compartment? If so, it's probably your Auxiliary Air Valve.
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.  Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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03-11-2013, 08:54 AM
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strange noise at idle
I can not locate the source and location of the noise..it comes from the engine area...
Yes the noise is not there at higher engine revolutions. I will evaluate results of depressing the clutch |
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03-11-2013, 11:14 AM
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If you've owned the car a long time, is this a new noise? or something developed over time?
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Sal 1984 911 Carrera Cab M491 (Factory Wide Body) 1975 911S Targa (SOLD) 1964 356SC (SOLD) 1987 Ford Mustang LX 5.0 Convertible |
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03-11-2013, 11:21 AM
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Strange noise at idle
I have owned the car for 15 years...Same noise since day one.
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03-11-2013, 11:26 AM
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Registered
Join Date: Aug 2009
Location: PNW
Posts: 2,977
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Quote:
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'84 Carrera Cabriolet |
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03-11-2013, 01:48 PM
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Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
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Noise.
David,
Have a look at the engine mounted heater blower unit during idle. There are several mounting points. Good luck, Gerry
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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03-11-2013, 02:28 PM
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1984 Cab Factory wide-body (M491 option)
911SC 3.0
