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Hi, my name is*****'m familiar with the SL. What's your question?
Hi Joe, I saw the description of the problem. You said 5 mechanics have worked on the car. What has been done so far?
Joe, I only get paid for my time if you leave a positive rating for my service. It's a waste of my time for me to tell you to check this and check that if you come back and tell me it's already been done. 5 mechanics have worked on the car and you think the problem is just an adjustment? I'm not so sure it's that simple. Has the manifold pressure sensor been checked for vacuum leakage? A bad manifold pressure sensor or a vacuum leak to the sensor is the most common cause of rich mixture.
Hi Joe, I appreciate your offer. There are only a few things that influence the mixture on the D-Jetronic system. Either the manifold pressure sensor is bad or the vacuum hose to the sensor is bad or the coolant sensor is bad or the wiring between the sensor and the computer is bad or the computer itself is bad. It's also important that all of the grounds to the computer and on the manifold are good and that the charging system is functioning correctly. There isn't much else that can have such a drastic effect on the mixture. Assuming that the ignition system is good I'd have to think that your problem is among those items. The pressure sensor is adjustable for full load by cleaning out the sealing compound at the end of the sensor and turning the Allen screw clockwise to lean the mixture.
You can reply back with any questions at any time if you want to bounce something off of me.