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lambda light on, poor idle 700

posted by  Wouter1973 on  Thu Feb 16 23:03 CST 2006
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I have a 740 GL, 1989, B230F engine and a lpg-installation.
My car idles at about 500 tpm at cold start. When warm, the car idles at about 900 tpm on lpg, but idles very rough on petrol.
The engine runs smooth on both lpg and petrol when driving.
My lambda light on the dash is on when switching to petrol. ECU gives code 1-2-1.
What is wrong? I checked the connector to the mass-meter, seems ok.







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