Question about 2000 Mazda Millenia

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P0302 #2 cyclider misfire

Originally had #2 cyclinder misfire about 4 months ago. Did full tune up using NGK plugs and wires, etc.. Still had issues so then replaced all the fuel injectors. The problem went away but then every now and then noticed a faint gas smell when parked in our garage. Check and could not find a leak. Anyway, now the #2 cylinder is misfiring again but only when starting it up after driving it. Basically, we would drive somewhere and would run fine and then park. When we come back to start the car up, the car would be idling very rough, the engine light would start blinking and then after a minute the light would stop blinking and stay on and the car would smooth out again. I also replaced all the o2 sensors about 3 months ago. A friend is suggesting change coil or fuel filter. Is this easy to do and is this actually going to fix the issue? Any suggestions are appreciated.

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  • Chris Denny Dec 10, 2012

    Would th pintle still be the problem if I replaced the injectors?

  • Brian Johnson Dec 10, 2012

    very likely if the code comes back a P0302

  • Chris Denny Dec 10, 2012

    ok. So I prob got a bad injector?

  • Brian Johnson Dec 10, 2012

    i would think so ....fuel smell, missing after sitting but goes away after it runs , isolated cylinder , all point to a leaking injector



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Sounds like the pintle in the #2injector is not properly seated allowing fuel to drip into that cylinder when the engine is off .

Posted on Dec 10, 2012


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Posted on Jan 02, 2017

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SOURCE: Mazda Millenia 2001 S. Engine

The injectors are weak/faulty.All the injectors needs to be replaced.This will solve the problem.The misfire is caused by faulty injectors. front plugs (cylinders 2,4,6) and rear plugs (1,3,5) .Replace all the cylinders. This cylinders gets covered by carbon layer and this causes the injectors to stop working.This carbon gets build up on the injectors due to faulty o2 sensor.So check if there is carbon build up on injectors replace all o2 sensor then check.If still the misfiring is there then replace all the injector cylinders this will clear the problem.
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