Hello Gentlemen,

I need your help regading a problem on my car that I've tried to solve since 2 years ago.

I'm owner of a W126 500 SE 1982 european versione 170Kw with no catalitic coverter (Engine M117963)

After a thousand of jobs done, The engine is still shaking only in idle. I've swapped all this parts:

- Spark Plugs cables (Bosch)
- Rotor brush by Bosch
- swapped 3 times all spark plugs with NO resistor version (Tried Bosch, Denso and Beru).
- New distibutor cap (Bremi one first time and now a brand new Bosch)
- all fuel injectors have been reppaced with original Bosch and also new seal.
- K jetronic refurbished and tested
- New OVP Relay
- Earthground checked
- Idle valve and related electronic module checked.
- Cilinder compression tested and are all ok
- New Bosch coil
- Tried to swap the TSZ module with a brand Hella one
- New Fuel accumulator
- New gas filter
- Fuel pressure tested twice and was around 4.6 and 4.8 bars.
- The firing point at idle with vacuum line attached is 15° degrees.
- All vaccum lines have been checked and the big grommet under KJetronic has been checked and is perfect.

Also the car has been checked by two mechanics but tit still has the same problem: when engine in idle it shacking a little bit and disappear when go up 1000 rpm.

I've tried to read forum all around the world but honestly I do not have any other idea on how to solve it.

Please do you have any suggestion or check to be done?

Many thanks from Italy.

Daniele