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83 911 Production Cab #10
Join Date: Jun 2009
Location: Ottawa, Ontario, Canada
Posts: 11,134
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Quote:
Originally Posted by National Chemic
I have a question, I saw a post about a slight knock, I recently purchased a 930 turbo, 1987, Mint car, all orig, 55K miles, at idle it has a faint knock, anything over idle. No noise at all, oil pressure goes up at rev, like it should, and no knock, pressure about 30lbs, at idle, only really does it once in a while, Today it did it, I know what a rod sounds like, It kinda sounds like it, But mechanic thought motor sounded good, wasn't doing it that day, Does the fan make that knock noise at idle
on alternator. could it be something else , when it does it , doesn't matter, hot or cold, doesn't matter when it doesn't do it hot or cold, only when I am alone does it do it. Oil is new and full, Car is a 9 on a 1 to 10 , and very well maintained, never run hard, or abused,
Could it be a wrist pin,
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As Bill mentioned, a pic of the car would help  
Get a stethoscope (less than $10) and listen to the engine when it does make the noise and when it does not. Would be easy to isolated to the fan, distributor, specific cylinders or valves.
Mechanic's Stethoscope $5 @ H.F.
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Who Will Live... Will See
83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
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