Question about 1991 Mazda 626

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Occasionally runs rough

Has good spark and fuel supply when it runs rough.Service light may or may not come on. also pukes black smoke during bad episodes.runs great most of the time but if you shut it off during bad episode it will not start for a few minutes.

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This sounds like your catalayic converter is plugged hence the black smoke at start up. your engine needs to breath and a plugged converter will make the engine run rough and have hard starting. please rate this

Posted on Oct 02, 2008

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This is usually caused by a bad crankshaft postion sensor.

Posted on Oct 02, 2008

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