S class w140 4.2 vibration

380560

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I own a 1995 4.2 S Class W140 and it appears to have developed a slight vibration/ judder when driving from cold. It is similar to a wheel balance judder but is not consistant. it feels if it MAY be coming from the from end but can not be totally sure. As I said it is NOT always present leading me to believe it is not the wheels. Can anyone help/advise me on what it may be please.
 

jibcl500

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Could it be a missfire???
Does it have distributor caps?

jib
 
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Thanks for your quick reply. It doesn't feel like a misfire, the dizzy cap has been recently relaced.
 

jibcl500

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What wheel and tyre size do you have fitted?
jib
 

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At what speed does it take place
 
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Hi, I have 235/60 zr16 Uniroyal tyres fitted
 
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Happens at approx 40- 50 mph but only when cold
 

jibcl500

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Ok tyres should ok then, some people fit huge alloys on the w140 and the rim buckle.

Any noise to go with the vibration ?

jib
 
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380560

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no noise apart from me!
 

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This is a long shot,,but are the tyres at the correct pressure,,I am thinking that if they are standing over night are they deforming, and take a while to warm up, and get to the correct shape. There are very few things that can only cause the fault from cold
 

jibcl500

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Id put it down to tyres too Malcolm. Or the dizzy caps are little damp on a cold start.
jib
 

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Id put it down to tyres too Malcolm. Or the dizzy caps are little damp on a cold start.
jib

Yes it the perfect time of the year for condensation under the rotor arm or in the cap
 
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380560

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Thanks for your thoughts...just a worrying thought of mine and not owning a W140 for very long... could it be a vibration from the auto box..maybe slipping, I don't know why I am even thinking of the autobox area as it changes up and down without any problems.....by the way the mileage is only 140,000 miles and the fluid is clear.
 

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This is nothing to do with the box or propshaft,,it would do it all of the time. one of the engine mounts may be low
 
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380560

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Phew......thats a relief, I was thinking way off line then.
Do these suffer from dizzy cap problems as i have just looked up in the history and it's had 2 replacements already!?
 

television

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If it does not do it when you are not pulling, the possibly tyres, if it pulls from a low speed Ok its not electrics, you can check this by changing gear when the fault starts
 


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