Question about 2000 Mazda Millenia

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3rd cylinder mis-firing

My Mazda recently starting acting like it wanted to die on me when putting in reverse or just starting the car or slowing down. My engine light started blinking at me so I brought it in to be checked out and all the machine would tell them was the 3rd cylinder was mis-firing but they could not tell me why unless they tore my engine apart to get to it. Problem is that I have a super charger and this is going to be costly to have done especially if for some reason it turns out that is not the problem. Shop rate is about $100.00 an hour and good luck getting a quote, I cannot afford to spend that kind of money on my car and I am hoping someone might be able to give me some kind of idea on how long it would take to do this kind of job? Or if there is a guide somewhere that I can follow myself and try to fix this? Any help would be greatly appreciated at this point, I have a two year old and cannot afford to have my car break down this winter with a child in it.

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  • tantal2010 Dec 17, 2008

    I have Mazda Millenia 1997 Miller Cycle engine ,the check engine always one and there is mis-firing on P303 which its the third spark plug-coil iginition maybe,can you show me in pictures or vedio how can I reach the spark plugs in the back,please?

    2- what is the TCS?always on the screen saying TCS OFF from right side and TCS from the left side?

  • Anonymous May 12, 2009

    As much as I have loved this car - I have found it to be more of a 'lemon' I'm replacing a #3 coil now too. Didn't even drive the car all winter. This will be the 3rd coil being replaced. I've been told it's a cheap job to do; unfortunately, don't have the connections yet to do it for cheap... ready to put on the chopping block.



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Ok, if they didnt lie to you you should be getting a P303 or something like that, if you know your spark plugs are still in good shape then we can rule that out for now. These cars are notorious for having the ignition coils going bad, you can find them on ebay alot for cheap. Now to test if it it infact your ignition coil (you ignition coil is what goes ontop of the sparkplug by the way) would be to take your #3 cylinder coil and switch it with your #2 cylinder ignition coil, disconnect the battery for a little while to reset the ECU. Now drive it around for a while until your check engine light comes back on, if the code has changed to a P302 then you know its that ignition coil that has to be replaced. Now back, if you switch them and it continues to be the same cylinder then it may possibly be carbon buildup thats causing the misfire. In this case I would go to PepBoys and buy a can of SeaFoam follow the instructions on the can (very easy) and run some of that through the PCV valve. If this still fails then you may just need to change your sparkplugs. This all may sound complicated but its very easy and not too costly it dealt with now. Let me know if you have anymore questions.

Posted on Sep 08, 2008

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Peter you can go to Napa or Oreilly's and bu a repair manual that has diagrams and schematics. it has specs and step by step instructions it costs about 20 bucks. by thye way you should not have to tear an engine aprt to find why one cylinder is not firing that is a load of ****. and if you do have to take it to a shop don't take it to a dealership. take it to a small shop the labor rates are alot less good luck if you need more help just click on my name...please rate this thanks

Posted on Sep 06, 2008

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I had the same problem and I found out it was shorting out to the ground. I could see spark and could not reach in there. I replace the spark plug and taped off the coil wire with elecctrical tape. It worked and check engine light went off

Posted on May 25, 2009

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