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Beitrag: [QUOTE="exmantaa, post: 571168, member: 8577"] "Wie Du aus meinem Text erkennen kannst suche ich auch noch den besten Punkt um Klemme 20 auf Masse zu legen. " ????? Is quite simple: Disconnect battery+ (I always do), disconnect ECU. Open the Motronic connector, find position 20 (=empty), and put a piece of wire in somehow. (if you can find a suitable female-pin, perfect!) bring the wire outside, so you can ground it now to the chassis of your car anytime you like. Your Motronic 2.5 gives a faultcode if your Lambda sensor is not working properly. (also when it's not there at all.....) By putting pin 20 to ground you solve this problem. Basically it's now an 20XE engine, no KAT and 157 PS or so. Lambda regulation is not working anymore, but it's possible to correct stationair CO by the potmeter I mentioned earlier. What German TÜV and AU say about this is of course your own problem..... If you want to "play" with air-fuel mixture, you can off course change fuelpressure slightly, or fool the engine-temp sensor! (colder = more fuel!) A tuner here in Holland once said to me that the main reason for power deviations between similar engines was not in the ECU (= identical program) , but mainly caused by variations in the sensors. (temperature sensors!) Just try! Frank [/QUOTE]

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