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  #1  
Old 04-27-2013, 02:22 PM
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Location: Atlanta metro area
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'99 E320 (210) thunk

Car emits a solid thunk under strong acceleration from a standing stop.
Engine/tranny mount?
I first thought it was steering as I had a worn tie rod but it still thunks after I replaced the rod.
Any particular procedure to follow to check the mounts?
If one is bad should I replace 'em all or only the bad one?
As far as I know, they are all original.
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1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
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  #2  
Old 04-27-2013, 04:29 PM
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Location: Evansville WI
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Will it also thunk if you try to start doing a power brake, in other words if you hold the brake with your left foot and goose the throttle a bit to torque the engine, do you get the same type noise? Sometimes a heat shield for the exhaust gets bent on road debris or some obstruction ans can make noises at certain times when the exhaust hits the shield, as an example. There are ways of physically checking for a worn motor mount. Could be one of those yet, or a trans mount, noises like this are tough to diagnose without being able to look around the car, sometimes if the car is put on a hoist it becomes apparent where the problem is right away to a trained eye.
Motor mounts are typically done in pairs, unless you really don't plan on keeping the car very long. If one is really bad and the other you know is good, you could do just one, in general I'd recommend doing both. Trans mount you can do just that part seperately.
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Old 04-27-2013, 09:26 PM
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I can feel the thunk when it occurs, it isn't a minor rattle per se. Will try the brake trick.

I have a lift but want to know where the best point(s) are to jack the engine to determine a bad mount.
__________________
1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
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  #4  
Old 04-29-2013, 06:44 PM
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rjk rjk is offline
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Join Date: Oct 2002
Location: Atlanta metro area
Posts: 198
Oh yeah, popped the hood & tried the throttle/brake trick. The engine was trying to climb out of the bay. New motor mounts for sure.

Any chance that could also be the source of my 55mph wobble?
__________________
1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
Reply With Quote
  #5  
Old 04-30-2013, 04:53 AM
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
I wouldn't think so, also does doing the power brake make the thunk noise?
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