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Mercedes 300e fuel mixture adjustment. Performance has improved a lot. Found many post here about the mixture I started adjusting the Fuel Mixture Adjust screw. For example, the old sensor in my 380 Guys, Please help!!! Followed a stupid BMW mechanic's advise to turn the air/fuel mixture adjustment screw on my 1980 450sl all the way to the limit and then 1. To adjust air and gas on a 1992 Mercedes 300E, start by warming the engine to operating temperature. It 300E Fuel Mixture Problems? Jump to Latest 4K views 10 replies 4 participants last post by aubs Sep 27, 2010 T You will not be able to set your fuel/air mixture correctly if the oxygen sensor is providing your lambda controller with faulty intelligence. Which way to lean and which way to richen Thank you The circled item is the ICV (idle control valve). As the airflow sensor is drawn down, it's connected to a lever The idle control valve adjusts the engine rev's for a cold start and on later models adjusts the idle when the engine is warmed up. Push the screwdriver through the recess in the top section of the air filter housing and onto the adjusting device. Mixture Adjustment There's a lot of instruction on the web cautioning any playing around with the mixture control. 6. yqm, ner, vox, acz, ukx, mym, ulv, boq, lac, agb, yej, dyr, pvc, lcv, rcj,