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156 2.0 poor fuel consumption

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I've not driven the alfa much as I've been restoring her. Now noticed that I'm getting under 20mpg (when the fuel dial works - lol). Could this be because I have fitted a CF3 engine - still using the original CF2 ECU and CF2 exhaust? (Fitted all the CF2 bits to it) Could it need tuning? Could it be caused by a blowing exhaust manifold (hairline crack)? Where do I start?
99 156 2.0TS
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start with looking at temp gauge, shoud be 90 when its warmed up, if not thats your problem, cannot advise about the engine swap as im not up on that.......could be worth doing ecu reset to learn new parameters of the sensors though
 
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