Question about 2003 Ford Expedition

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My 97 expedition has a miss fire. was told by canadian tire that it was something wrong with the engine, meaning it was no longer any good. i changed the coils and the wires as well as the plugs, the vehicle got better but not smooth it still has a miss. when i changed the plugs i noticed that there were a few that appeared green in color as if it was burning anti freeze but it is full in the bottle. was told it may be the valves in the head due to carbon build up. i bought this rig for my wife and would like to know for sure what is wrong. is it spark, is the motor gone, is it the dome gasket, or is it burning coolant.

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First off, I would get a second opinion (and not put alot of faith in C/T) I would get the cooling system pressure tested & checked for leaks internal & external to eliminate bad head gasket or cracked coolant passage way. (If it had an internal leak - plugs would be wet and you would see white smoke from exhaust) RE; miss - run a really good/strong fuel system cleaner through it (Seafoam,STP, Gumout) and then change fuel filter.

Posted on Apr 07, 2011

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