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The first thing you need to do is get the ESM (electronic service manual) for the (W201)...

The first thing you need to do is get the ESM (electronic service manual) for the (W201).

I have had a similar problem which I have been chasing for over 4 months now & counting. Arghhhh !![:(!]

Believe me when I say this, I have changed more parts on my car than most people do over a the lifetime of their vehicle.

EHA - Electro Hydraulic Actuator, check the voltage readins to it.

Also, perform a fuel flow test !

Another problem is that the poteniometer on the airflow meter could be causing inaccurate mixture. I could go on & on & on, but it would be best to spend the coin & have it diagnosed rather than go the route I did. But hey I am a Mercedes parts dude [:eek:)]
 
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