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charles-carol

Focus 1.8 TDCI

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2007 140,000 miles. Had this car for one and half years hasn't missed a beat for 20,000 miles. Starts first time every time but has developed poor idle and running. Slight black smoke on heavy acceleration which clears. Sometimes feels like its running on three cylinders which evens out at 50 MPH. In heavy traffic idle sticks at 1200 RPM. I have checked fuel filter, air intake and cambelt seems ok. No lights on dash no fault code present.

What can cause this engine to run so badly?

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