Lean is CCW. I did this same adjustment on my 86 300E. I went 1/2 turn to lean and it made all the difference in the world to the initial acceleration. Felt like getting 50 hp. Use a long shank 3mm allen. It is spring loaded, so push down until it bottoms out.
I also picked up more than 1 mpg in town. I now average almost 24 under normal driving. A bit better than 26 on the highway at 85 mph.
If you push down to far the engine will cut out! You just want to push down enogh to engage the screw underneath the plunger with the engine running. You need to monitor pin 3 of the diagnostic socket using a duty cycle multimeter and get it to 45-50% duty cycle.
Yal, if possible, I'd like to adjust the mixture on my E320. I'm getting a code that tells me the Lambda is out of limits. Can you tell me where the adjuster is for the E320, and how to measure the duty cycle? I have access to a fluke multimeter.
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I'll PM you tomorrow with the multimeter model number I purchased from Sears. It was less than $40 bucks. You need a meter that has a duty cycle feature.
Actually I was checking all vacuum hoses and found a crack one, I can not ID for you though. As far as the adjustment is concerned, this was previously posted by member Yal. ( Thanks Yal !!) Do an additional search under idle mixture or fuel distributor adjustment and you should be good to go. This forum is a great source for maintaining and trouble shooting
Its pretty simple. Now it may not be the cause of your problem but its a good start. What you need however is a multimeter from sears that reads duty cycle as a %. Real cheap cost about $30-40, and invaluable Sears.com 482139000. Then you need a set of allen keys, I believe the adjustment nut is #3 allen size but I am not sure, I just bought a set of them. Take of your air cleaner and you'll see a "steel" tower next to the fuel distributor. The adjustment nut is located inside at the bottom of that tower. Now you have to locate the x11 connector on the driver side fire wall. Its basically a round socket. It looks like something should be plugged into it. Its usually covered with a plastic screw cap.
With the car running and warmed up and your mutimeter set to duty cycle stick the positive terminal into the number 3 hole of the x11 connector and ground the negative terminal. I usually stick the negative on a strut support bolt next to the driver side hood hinge.
Then watch the duty cycle. If its not swinging back and forth make sure you selected % by pressing one of the selectors at the top of the multimeter (took me forever to figure this out).
The duty cycle should fluctuate around 50%, if it doesn't you have to adjust the screw at the bottom of the tower until it does. If I remember correctly clockwise brings it up and anti clockwise vice versa. Adjust by small increments and wait 10 seconds each time. The screw is spring loaded and so you have to depress it a little to get it to engage before turning. If you depress it to far the car will cut off.
Thats it.
It could turn out that all you need is a fuel filter change
If you do this let me know what you find. You can check the same thing from the EHA which is a little balck box at the back of the fuel distributer but you need a test harness for this.
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