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#1
02-21-2010, 02:49 PM
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1998 E300 Tapping/Cracking/Tock Tock Sound From Rear as Accelerating
My 1998 E300 (102,250 miles) has developed an interesting knocking sound from the rear. The sound usually happens when I am accelerating from a stop and is most audible with my window down. In fact, if I am next to another car, the tapping (like a noisy tock tock tock which increases with speed) echoes very loudly. This is definitely an "under load" sound but I don't know what part in the rear can possibly make such a sporadic knock under acceleration. Could it be a flex disk or driveshaft issue? It's more of an annoyance than anything else, but I would still love some opinions.
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1982 300D-T (sold) 1988 300E (sold) 1994 E320 Wagon (sold) 1995 E320 1998 E300D-T 1999 E3204M Wagon 2001 E320 2005 E320 CDI 
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#2
02-21-2010, 02:53 PM
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The CV joints are worn out, or it could possibly be a bad wheel bearing.
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#3
02-21-2010, 04:20 PM
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I'll go along with that
Better check those CV joints in the rear axles. Sounds like you have one that is about ready to come apart on you.
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Junqueyardjim Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis 1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA 2003 Jaguar Type X, AWD. beautiful, good mileage, Mom's car, but I won't let her drive it!
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#4
02-21-2010, 05:50 PM
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I would first inspect the CV boots for tears. Then give it a good look around the drivetrain while on a rack. Then I'd see if the sound could be detected while running in gear on the rack. Possible wheel bearing?
Let us know what you find out.
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'06 E320 CDI '17 Corvette Stingray Vert Last edited by Skid Row Joe; 02-21-2010 at 06:00 PM.
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#5
02-21-2010, 07:02 PM
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Thanks for all the replies! I noticed that the CV issue is more prevalent on W123 cars than W210--only threads on 210 relates to front CVs on 4Matic cars. I went out and looked at the CV boots on the diesel and all the rubber components seem to be intact. What should I look for?
That tap tap tap increasing with speed from a stop is only intermittent and usually occurs in 3rd gear (if that means anything??). Thanks!
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1982 300D-T (sold) 1988 300E (sold) 1994 E320 Wagon (sold) 1995 E320 1998 E300D-T 1999 E3204M Wagon 2001 E320 2005 E320 CDI
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#6
02-27-2010, 10:01 PM
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Update
No new developments from the CV side...but the tapping noise seems to be coming from the LEFT back tire...any ideas?
__________________
1982 300D-T (sold) 1988 300E (sold) 1994 E320 Wagon (sold) 1995 E320 1998 E300D-T 1999 E3204M Wagon 2001 E320 2005 E320 CDI
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