The EHA adjustment instructions on the internet seem to me to be of the "twist it a quarter turn it'll be amazing" advice that I personally avoid like the plague. Always best to measure what you are adjusting rather than using the force. If you don't have the fuel pressure kit with the 2 way switch forget it.

The first step I can recommend is to simply remove the fuel distributor from the top of the mixture device and check for a freely moving plunger.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!