[W126 Coupe] Drive line vibration and idle problem

[Dick Spellman]

jay schettler wrote:

> Hi folks,

>  I have an 87 560 SEC with 303,000 miles on it. I am experiencing a 

> couple of problems. There is a vibration in the drive line above 55MPH 

> to about 70MPH. Could it be the drive shaft out of balance? Also, at 

> idle, the motor will skip a beat every so often like a cylinder isn't 

> firing. At initial take off, it feels as though a cylinder or two 

> hesitates. Above 1800 RPM, the motor runs fine. Any help is greatly 

> appreciated.

> Thank you,

> Jay

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Hi jay:

Great mileage report for that SEC.  Obviously you have been having it 
serviced regularly.  I'd check flex disks & tires for a starter on the 
vibration.  You don't mention a rumble or harmonic noise so that's good 
news on the rear end with that many miles.  The skip could be many 
things, plugs, wires, cap, rotor on the electrics.  Bad injector or two, 
bad injector seals on the fuel side.  Could also be cams and/or rockers 
showing some signs of wear.

So, best bet is to have the car inspected and properly diagnosed then 
you can probably take another 300k miles with some care.

Regards,
Dick