Fuel Injection Problems of Mazda Protege

I have had two occurrences of screws from the butterfly valves on the vtcs system from the intake of my 2003 Mazda Protege 5 coming loose and being sucked into the combustion chamber of the vehicle. Each instance has caused the piston to knock the screw into the spark plug, thereby causing failure of a spark plug, which causes the engine to misfire to the point where it is undrivable, thereby leaving me stranded on the side of the road. The first incident was misdiagnosed (spark plug replaced). The second was diagnosed correctly and the intake manifold assembly was replaced. This is a widespread problem with the 2. 0l fs-ze Mazda engine. Many other owners have had the problem. . Read more...

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Check engine light has been coming on for last year. Problem is with engine misfire/catalytic converter. We have replaced everything suggested: spark plugs, wires, catalytic converter, engine tune up, new tires, etc. Problem worsening. Car riding rougher, worsening gas mileage.

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