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Hello. I have a problem with my Audi 90 2.3 quattro 7A engine. 1988 model. Cars idle fine when cold and co2 is at around 1.9 and when it gets really hot and the thermostat opens it starts to smoke blue and the exhaust smells of petrol and co2 is suddenly at 2.6. yes, I have changed the lambda sensor. can anybody help me..?
 
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