Question about 1997 Mazda 626

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When accelerating the engine seems to stutter.

When i accelerate there seems to be jerkiness to the throttle and the engine stutters as if the fuel is'nt getting through or it is'nt firing on all cylinders however, when i rev the engine in neutral all is well i.e. no stutter and it ticks over at idle without a problem. It is a 1997 mazda 626 2.0 lxi manual. Any ideas? Many thanks.

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  • trev3635 Jun 02, 2009

    Thanks a lot for the reply. I also have tried exactly the same as you did with the extra of checking for breaks and cracks in all breather pipes and vaccuum hoses took me days. I'll give that a go and see how i get on and let you know.



    Cheers.

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Try unplugging your Mass Air Flow Sensor (MAFS) - you'll find it on top of the metal body immediately after the air filter. I went through an 18 month ordeal - replaced fuel filter, fuel pump, dropped fuel tank and cleaned it, ran 55 gallons of fuel injector cleaner through the system - nothing! After reading some blogs on this car/engine, gave the MAFS unplug trick a try. The car instantly corrected itself (when you unplug this sensor, the engine control module reverts to factory default, allows sufficient fuel into the engine for unitterupted performance.) However, if this corrects your problem, it's only a temporary fix. Run it about 3 days - it you notice soot in the tailpipe, the factory default is running too rich. Replace the MAFS.

Posted on Jun 02, 2009

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