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I have noticed a mild vibration in my 2000 E320 4Matic with 7000mi. I bought it recently and the previous owner had the tires balanced at about 3000mi for the same reason. It feels like a flat spot in a tire (but does not improve when the tire heats up) and I can reproduce it at several speeds, the most common and convenient of which is 37mph. I have swapped the spare on each tire location and it resolves somewhat when the spare is placed on the left rear. My theories are a slipped belt, bad rim, out of round tire. How can this be checked. Naturally, I will have the tires balanced again but if that does not do the trick, does anyone have any other theories or trouble shooting advice? Also, what is the max weight that can be put on a tire before it is considered 'bad?' Do 4Matics do this?<br><br>
I am new to this group (this is only my second posting) and have enjoyed reading the various forums. Thank you for your responses.<br><br>
Best regards,<br><br>
Nick<br><br>
Boston, MA<p>
 

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Have a road force variation test performed and you should be able to determine what the problem is. In order to do this test you will need to find a sho[p that has a GSP9700 balancer for Hunter. You can locate one of these remarkable machine on hunter website<br> <br> Luke<p>tiresales.tirerack.net
 

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The Mercedes dealer is listed in the Hunter website so I assume that this is the machine they used. Should I ask for a specific test or is a balancing request adequate. Thank you for your response, Luke.<p>h002078d6790e.ne.mediaone.net
 

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Re: ask for a load force vaiation test ... and get the actual results

Luke, thank you for your assistance. I will get the load force variation test done and let you know the results.<p>h002078d6790e.ne.mediaone.net
 

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Re: ask for a load force vaiation test ... and get the actual results

Got the results on the one suspect tire. Will get the others done soon. MB dealer said that the test result was a 13. He said 10 was very good, 20 is bad if I recall correctly. Improved but still a little vibration. I will mount my friend's tires and rims on my car when he gets his snows on and do some more diagnosis. I will also have my spare swapped and mounted on the rim with the bad tire. I will also try to get tires balanced on the car. I'll let you know what happens.<br>
Nick
 

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Update - I started an earlier thread re: vibration and have had some more work done this week to help solve the problem. Luke, you were right. The dealer tested the runout on my tires and said they would replace my tires. First they mounted new tires and rims from a E320 in stock. They told me the tires were even worse - out of round. Same problem with tires from a second new car. On top of that, my loaner was a 2002 E320 with 10 (ten) miles on it. Same vibration at 36mph and at various other higher speeds. The vibrations did not go away after warming up the tires. <br>
Finally, they mounted brand new tires (Mich Energy MXV4 Plus). These were much better. I can feel a flat spot in the morning but it improves after 4 or 5 miles. Is this usual? There is, however, still a mild vibration in the frame, seats, at various speeds. Can this be a problem with the bushings in the shocks, suspension, differential, shafts? Here is a clip of a discussion forum from MB Owners Club re: same problem fixed with new bushings. You have to be a member so I have pasted 2 quotes. <br>
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QUOTES from MBCA.org <br>
'Subject: RE: E320CDI vibration From: [email protected] <br>
Date: 25-Nov-2001 <br>
Hi John, I had a vibration at 80-90km/h on my 1997 E420. After much work ( all this was done under warranty) like changing motor mounts, steering rack, center support bearing, tires, ect. It turned out to be the upper rubber shock mounts ( changed front and rear) This completely eliminated any trace of vibration in my car. It also made the car feel as tight as new. Cheers, ED' <br>
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'Subject: E320CDI (UK) vibration: gone! From: [email protected] <br>
Date: 07-Dec-2001 <br>
To all who responded to this problem,especially those who recommended changing all the shocks and mounts: the problem has disappeared! A full set of new M-B factory-fit shocks and bushings...were fitted by the dealer, and there is now no trace of the vibration. The original focus was on wheels, tires, prop, engine mounts, all of which have been changed. You wouldn't think that shocks/bushings could be the problem, but I guess every wheel and tire has some degree of imbalance which the shocks and bushings are designed to isolate. If they are not in perfect condition, then this imbalance is transmitted to the whole car. After 33,000 miles...it feels like a different car. Thanks again to everyone who replied.' <br>
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Luke - what do you think? Sorry for the long post but this is one of the few successful fixes reported by happy owners who were as frustrated as I have been. I have been surfing forums for months now. Thank you for all your past and present assistance. (also posted today on MBWorld.org)<br>
Best regards, <br>
Nick
 
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