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My car a super *****y OBDII engine that hates its closed loop being modified so its hard as hell but english cars didnt adopt OBDII until 2000 right? Find someone with a mercedes diagnostic computer and adjust the fuel trims reading off that for the closed loop settings and see if you can dig up when the car switches from closed to open loop. Im pretty sure its based off the throttle position.
I was told that if the fuel trims are bouncing around on the scanner then the closed loop is out of wack and you need to +/- fuel. You have to get them in a healthy constant and it will take a while.
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