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Registered
Join Date: Dec 2008
Location: Latrobe, PA
Posts: 407
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Knocking noise
Randomly my car started making a knocking noise, it sounds similar to if you put a baseball card on a bicycle rim. It seems like it doesnt exist at idle, or in neutral no matter how high i rev it. I notice it the most when im taking off in first, and it gets faster with the rpms, but not louder. If im in 2nd or 3rd and at low rpms and tramp it, it gets louder. The car runs perfect like it always has, all fluids fine, never overheated. I'm pretty confused. Any help would be much appreciated. Thanks!
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'87 Guards Red 924S - First Porsche - SOLD 5/21/10 '67 Red VW Beetle - Restored by me and my dad, 2115cc motor.  '87 951 - Silver/blk, full leather interior - LR Chips - 3 bar FPR - LBE '92 Ford F150 - Winter truck '04 Yamaha R6 |
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02-03-2010, 01:21 PM
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On Boost
Join Date: Dec 2009
Location: Melbourne, AUS
Posts: 398
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Front or back?
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86 952 GTX3076R, M-Tune, eBoost 2, CEP/JME cam, CEP head. |
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02-03-2010, 01:28 PM
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Registered
Join Date: Dec 2008
Location: Latrobe, PA
Posts: 407
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That's the question I was afraid of. Honestly, I cant tell. I originally thought it was the back, but after just taking it out it could be the front.....I really can't tell...It's not only when im turning or anything like that though
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'87 Guards Red 924S - First Porsche - SOLD 5/21/10 '67 Red VW Beetle - Restored by me and my dad, 2115cc motor. '87 951 - Silver/blk, full leather interior - LR Chips - 3 bar FPR - LBE '92 Ford F150 - Winter truck '04 Yamaha R6 |
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02-03-2010, 01:32 PM
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On Boost
Join Date: Dec 2009
Location: Melbourne, AUS
Posts: 398
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Hmm, check your wheel bearings.
Or jack the car up, give the wheels a spin & a shake and see if you hear any noises from there.
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86 952 GTX3076R, M-Tune, eBoost 2, CEP/JME cam, CEP head. |
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02-03-2010, 01:39 PM
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meister member
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Does it vary with engine speed or vehicle speed?
Speedy 
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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02-03-2010, 02:05 PM
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Registered
Join Date: Dec 2008
Location: Latrobe, PA
Posts: 407
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It varies with vehicle speed, is definitely coming from the back, and does not make the noise when going downhill in neutral, or if i rev it in neutral.
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'87 Guards Red 924S - First Porsche - SOLD 5/21/10 '67 Red VW Beetle - Restored by me and my dad, 2115cc motor. '87 951 - Silver/blk, full leather interior - LR Chips - 3 bar FPR - LBE '92 Ford F150 - Winter truck '04 Yamaha R6 |
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02-04-2010, 07:49 AM
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Toofah King Bad
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Time for a CV service.
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» 1987 924S Turbo - Got Boost? « "DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc |
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02-04-2010, 07:55 AM
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Feelin' Solexy
Join Date: Oct 2003
Location: WA
Posts: 3,793
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Quote:
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Grant In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 2011 Pursuit 315 OS, 2022 Tesla Y Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S |
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02-04-2010, 07:57 AM
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Toofah King Bad
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. . . which is a 6mm triple square. Also get new boots, several cans of brake cleaner, and the correct grease (I get German CV grease from my local VW speed shop. . .one little packet per joint). New bolts (also from the VW shop) are not a bad idea either.
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» 1987 924S Turbo - Got Boost? « "DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc |
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02-04-2010, 08:01 AM
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Under the car
Join Date: Jan 2008
Location: Ross, Ohio
Posts: 585
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You better hope it is CV's at least because the other alternative (ring and pinion) would be much worse.
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02-04-2010, 08:15 AM
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Registered
Join Date: Dec 2008
Location: Latrobe, PA
Posts: 407
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Well would CV's only make the noise when the car is in gear? (as opposed to in neutral while moving) And wouldn't a ring and pinion being messed up be the equivilant of a blown transmission and it wouldn't shift right? Transmission stuff scares me.
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'87 Guards Red 924S - First Porsche - SOLD 5/21/10 '67 Red VW Beetle - Restored by me and my dad, 2115cc motor. '87 951 - Silver/blk, full leather interior - LR Chips - 3 bar FPR - LBE '92 Ford F150 - Winter truck '04 Yamaha R6 |
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02-04-2010, 08:52 AM
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Toofah King Bad
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One thing at a time, m8. Work on those CVs and I am willing to bet the noise will be gone.
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» 1987 924S Turbo - Got Boost? « "DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc |
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02-04-2010, 09:04 AM
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Registered
Join Date: Dec 2008
Location: Latrobe, PA
Posts: 407
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I felt the CV joints, and it feels like they're totally empty. I am assuming you should be able to feel some grease or something inside? DO you think I could get away with repacking them as opposed to replacing? none of them look cracked or destroyed.
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'87 Guards Red 924S - First Porsche - SOLD 5/21/10 '67 Red VW Beetle - Restored by me and my dad, 2115cc motor. '87 951 - Silver/blk, full leather interior - LR Chips - 3 bar FPR - LBE '92 Ford F150 - Winter truck '04 Yamaha R6 |
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02-04-2010, 11:45 AM
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Toofah King Bad
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The bellows don't need to have grease in them. You need to get them apart and cleaned to assess their condition.
However, the longer you drive them while they are clicking, the less likely they can be saved.
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» 1987 924S Turbo - Got Boost? « "DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc |
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02-04-2010, 01:25 PM
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Registered
Join Date: May 2004
Location: Brandon FL
Posts: 371
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I vote on rear wheel bearing.
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Rick 99 996C4 06 525XI 87 944S - Sold 77 924 - Sold |
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02-04-2010, 03:39 PM
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Registered
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look for holes in the rubbers. Is sounds like cv to me too, clickety clackety, usually i first notice it on accel or deceleration. once i cleaned mine and reversed them but that only lasted for a thousnad miles or so. got used ones cheap from john in ohio.
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chance favors the prepared mind 1987 944 n/a 5spd. who remembers dial phones?. 'STOP FIXING THINGS ONE STEP BEFORE YOU BREAK SOMETHING ELSE" |
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02-06-2010, 09:56 AM
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Shaggy
Red
Chumpy
Weiße Scheiße
1987 Porsche 944 2.5
