Mercedes w126 Fuel Mixture Adjustment

[Pfinix]

Hi There,

How to properly adjust fuel mixture in 116 engine using that allen bolt? did someone know how many turns??
as far i know clockwise make a richer mixture , but how to check is enough rich.

do I need exhaust gas meter and if i need what should be readings.

Thank you all in advance for any help you can provide

 

[carat 3.6]

Welcome to the forum.

That screw is a last resort, and should only be messed with if everything else has been checked.

 

[jaymanek]

You press down on it until it catches and them It takes very minute turns, definitely need a reliable gas analyser, maybe ask to use the local mot station one? Or let them do it...

Reading should be around 1.5% at warm idle. Remember any adjustment will take 30 secs to level out on the co meter...

 

[Pfinix]

From some time exhaust gas smells really rich, also when I waiting on traffic lights and try start very fast , car start choking and jumping (to rich rich mixture?) New Spark Plugs new ignition coil, new leads, only mixture left to play.
I can find any locally trusted mechanic (Two independent Mercedes specialist let me down)
Consumption fuel at this moment is around 15 MPG.