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SLED GUITARIST
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strange ufo noise
I have a wierd slight ufo noise coming from the 944S. I took the front timing belt area a part to trace but it sounds more like under the intake. It only there at idle, and goes away while driving. Main/rod bearing?
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1988 944S Guards Red---Hers FRWilks Chip, MSD Blaster 2 1987 944S Blue Diamond Mine Crankscapper, MSD Blaster 2 Coil, Weltmeister Race chip, Sports pack. Hit by a sleeping driver at 2pm, soon to be the Black and Tan 1985 944na Gray---His Eibach Gound Control Struts/Koni Rear, Throttle Response cam. SOLD 
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02-12-2011, 05:23 PM
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Join Date: Feb 2008
Posts: 18,570
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shot in the dark. Loose timing belt slapping the covers.
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dolor et pavor Copyright |
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02-12-2011, 05:28 PM
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Registered
Join Date: May 2009
Location: Hawkinsville / Perry, Ga.
Posts: 1,239
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A Big WAG, Vaccum Leak.
Cheers, Larry
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Retired USAF and Civil Service, 1985.5 NA Graphite Metallic, A never ending work in progress, 1992 968 Horizon Blue Cab "New Toy" 
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02-12-2011, 08:08 PM
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Garage Helper
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Could be an Injector noise - maybe a clickety clack ???
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78-924 traded for 80-931 traded for 84-944 traded for 85.5-944 (7th one now). UAV-M1 (Urban Assault Vehicle - Model 1) Bless the lowered, and pass the nitromethane. Pedal to the metal till you see the gates of hell then brake NLA - No longer available is a four letter word |
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02-12-2011, 09:16 PM
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SLED GUITARIST
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More like a whirling woo woo woo woo.
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1988 944S Guards Red---Hers FRWilks Chip, MSD Blaster 2 1987 944S Blue Diamond Mine Crankscapper, MSD Blaster 2 Coil, Weltmeister Race chip, Sports pack. Hit by a sleeping driver at 2pm, soon to be the Black and Tan 1985 944na Gray---His Eibach Gound Control Struts/Koni Rear, Throttle Response cam. SOLD
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02-13-2011, 09:09 AM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Vacuum leak would be my guess, too. There's not much else that could do that under the intake, unless it's the idle stabilizer. Does having the clutch in or out while sitting still change it at all? (torque tube bearings)
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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02-13-2011, 09:52 AM
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SLED GUITARIST
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I will check for a vacuum leak again. It does not matter if the clutch is in or out, or if its in gear. I removed the front timing cover and ran the car. I noticed the sound a while ago, and used the screw driver to isolate the sound. It was @ the top balance shaft area, so i replaced all the bal shaft bearing. But it did not go away. It does not seem to effect the engine, but would hate to have to rebuild the top again. It does have almost 200,000, and as far as I know the bottom has not been touched.
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1988 944S Guards Red---Hers FRWilks Chip, MSD Blaster 2 1987 944S Blue Diamond Mine Crankscapper, MSD Blaster 2 Coil, Weltmeister Race chip, Sports pack. Hit by a sleeping driver at 2pm, soon to be the Black and Tan 1985 944na Gray---His Eibach Gound Control Struts/Koni Rear, Throttle Response cam. SOLD
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02-13-2011, 10:52 AM
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RED
GRAY
Mine
ORACLE
