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is the ecu faulty?

an intermittent fault has happened . the vehicle seems to be over fuelling,,, heavy black smoke but sometimes clears. fuel consumption down to 20 m.p.g. poor starting when hot.
peter c, November 2010
Check the coolant temp sensor first.steve

steve, November 2010
the type of vehicle is a 1999 saxo 1.4

peter c, November 2010