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To adjust you must first remove the EHA & since is is in the fuel circuit don't do that with a warm/hot engine. Of course the key must be off. Be prepared to have fuel spray from the connection. Have rags available!
To adjust you will need a 2.5MM allen wrench, remove the brass closing plug (screw) & then the allen adjustment will be apparent.
NEVER move the the adjustment more than 1/6 of a turn at a time. Clockwise will create a higher differential pressure & therefore slightly richer at WOT.
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MERCEDES Benz Master Guild Technician (6 TIMES)
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44 years foreign automotive repair
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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