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Tkid 007
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Thumping Noise
Hey Gang, I just acquired my first 944 and it was GREAT to find this site. I bought a 85.5 auto and I have a problem with an intermittent thumping from the right front. It doesn't seem to be related to RPM, moving speed or braking. I hear it setting still in the driveway or sometimes driving. It almost sounds like a duct door slapping open and closed but its loud. The car is smooth at idle and at all ranges on the highway. I'm at a loss....... any help would be greatly appreciated.
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05-19-2011, 04:17 PM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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I had an intermittent thumping from the right front. My front struts were shot.
I do not know if you planned to get an alignment or wheels with your 944, but you should check the struts and the front "A" /control arms for bushing wear. These are common areas. Check all rubber. Check the rubber bushings on the front sway bar. GL & welcome John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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05-19-2011, 04:48 PM
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Tkid 007
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Thanks for the response AZ but I can't figure out why it would do this setting still in the driveway. It seems suspention problems would be noticed in motion. Is there a possability it is the flex plate?
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05-19-2011, 05:25 PM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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By sitting still I guess you have the engine running.
Time to go to Harbor Freight and buy the cheap stethoscope. If you do not have a store near you get a piece of hose and put it to your ear and go from part to part. The flex plate is not something you want to go bad== $1200 just for the flex plate and a lot of labor. GL John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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05-19-2011, 08:16 PM
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Registered
Join Date: Jul 2009
Location: Salt Lake City, UT
Posts: 32
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Check the cruise control unit. Mine made a clicking noise that would drive me nuts.
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05-19-2011, 08:36 PM
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Registered
Join Date: May 2009
Location: Colorado Springs, CO
Posts: 721
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How about a video? It sounds like you are saying its loud? What's loud to you? What pitch? By thump I think of a tank firing a round from a distance. (Live near big army base) could it be a rogue heater flap? That wouldn't be very loud but it would he distinct and could be described as a thump. That could also explain its seemingly random appearance. Be a little more descriptive and try to catch the sound live.
I just used "rogue heater flap in a sentace. Top that. Lol"
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82 928 s3&1/2 5 Speed LSD conversion 87 944 N/A 5 Speed (Under Construction) 81 931 (maybe for sale, well their all for sale lol) Always looking for a good deal. Hello, my name is Carl and im a Poschaholic |
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05-19-2011, 09:32 PM
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Banned
Join Date: Apr 2011
Posts: 683
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sway bar bushing in the mount/brace. it's a piece of rubber directly under the power steering tank that love to get leaked on. they deteriorate and fall out of the mount and it thumps pretty good.
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05-20-2011, 11:54 AM
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Registered
Join Date: May 2009
Location: Colorado Springs, CO
Posts: 721
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I think he said it happens at a dead stop with the engine running but im not positive.
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82 928 s3&1/2 5 Speed LSD conversion 87 944 N/A 5 Speed (Under Construction) 81 931 (maybe for sale, well their all for sale lol) Always looking for a good deal. Hello, my name is Carl and im a Poschaholic |
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05-20-2011, 12:35 PM
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Banned
Join Date: Apr 2011
Posts: 683
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Quote:
heater vents would likely not be able to open in the first place if they are weak enough to slam shut enough for a loud thump to be made. without video/audio like was mentioned above we can't really know what "loud" means to the OP. OP, do you still have the original radio installed? when they go bad they can short current to the speakers which makes a pretty loud thumping noise. |
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05-20-2011, 02:46 PM
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Tkid 007
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You guys are great, thanks for all the feed back. I'm crawling under it tomorrow. I'll check all these suggestions. 8Ball, I was thinking curse control as well. Mine will not hold speed but will accelerate if I hold the lever. I opened the survo as advised on another tread on the site. I noticed that the link-ball lever was free floating before I opened it. I cleaned the contacts on the circut board and reassembled with the retention spring in place. Didn't fix the cruse but the noise is coming from that area. Fway, I eplaced the A/C compressor two weekends ago and found the rear P/S mount bolt missing (the one with a bushing aroung it). I'll check the swaybar busing tomorow. I'll let you'all know what I find. Still looking for suggestions. Thanks again!
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05-20-2011, 03:46 PM
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Tkid 007
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OH, The noise is kind of like a rim shot on a snare drum. It veries in rythum and is not consistant with car in gear, rolling or not, A/C on or off or anything I can figure out........
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05-20-2011, 03:52 PM
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Tkid 007
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Ok, the swaybar bushing was fine. No P/S leaks. I checked the air recirculation doors on the blower cage and vacume is good. I disconected the cruse control cable and so far so good. I'll update in a week or so.
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05-22-2011, 08:08 AM
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Tkid 007
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Ok everyone, the noise came back only this this time it continued untill I could open the hood and investigate. 8Ball you were right, the curise control motor was bang'n away.... did you replace yours or fix it?
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05-24-2011, 12:43 PM
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