Question about 2004 Mazda 6

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I purchased a used Mazda 6 for my son to take to college. We already replaced three ignition coils; the first wasn't needed until about 50K miles, but the other two had to be replaced on a few thousand miles between each other. My mechanic tells me that he hasn't had to replace the previously changed coils. The car is in Florida, so rain could be an issue if moisture is suspected. Is it better to change all the coils at once along with the plugs and maybe the cables? One issue is my son puts off getting the problem corrected and drives for some time before finally getting it done. Does this add additional stress to the remaining coils. I looking for the silver bullet here. I don't mind spending the money to get it done once and for all. Thanks

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  • sfliving Aug 29, 2010

    But should I replace the entire set at once along with the cables and plugs? How is the dieletrical grease applied? So you believe it's all moisture related....

  • sfliving Aug 29, 2010

    I have a problem with a 2004 Mazda 6. The ignition coils are failing apparently 1 at a time. Is it better to change them all at once? I would think that if one fails there's more stress on the remaining 5. If three have been changed so far with no repeats, changing the other three at once might work. Should I change the plugs and cables as well? Are you an expert on this car, this model, or auto electrical problems in general?

  • sfliving Aug 29, 2010

    Makes sense. If I have the dealership do the work, what can I expect for a warranty or guarantee? I know it can vary, but just checking. Also, are the newer Mazda's better? Was this a systemic issue for a a certain vintage?

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  • Master
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This vehicle utilizes a waste spark coil ignition system, meaning each coil fires 2 cylinders at once. if there are misfires on sister cylinders, it is a clear indicator that the coil is bad.

that being said, sometimes you can get away with changing just one coil, other times situations like this arise where they just all go in a relatively close time frame. its really a judgement call, but i would certainly pair it up with changing the wires.

if one bank of cylinders has been misfiring for an extended period of time, it can cause fuel trims to be richened to the point where the other plugs have now been fouled. any time there is extended misfire drive time, all the plugs should be replaced, and close attention should be paid to the oxygen sensor afterwards to ensure that it is reading correctly (on your mechanics diagnostic scan tool). if it is a simple tune up related issue, this should fix your problem.

just as a note, i personally take the chance in changing one coil at a time (giving the customer the option of course). often the remaining coils will continue on no problem, but if one was not working quite right before, the new coil will all of a sudden accentuate it quite a bit. it is a judgment call on every car.

good luck and feel free to ask if you need any more clarification!

Posted on Aug 30, 2010

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  • Mazda Master
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Both the logics work fine. If you have a faulty coil then it is better to replace the faulty one immediately . But if over a period of time there is a systematic failure due to many reasons such as the one you mentioned about moisture accumulation, then the whole set must be replaced so that you will not encounter a fault of this nature when on an emergency.
There were times before when we would have changed/replaced spares only on failures. But now we have a scheduled listing for the mileage covered for replacement of spares irrespective of the perfect working of the component at the time of change but for a precaution.
So also in your case the decision lies with taking chances. You can have your decision to be in consenses with the Mechanic who attends to the vehicle.
But an Advice is to get the scheduled work attented by the Mazda service centre if it is not done so.
Finally if the vehicle is checked up in this schedule there can be no major issues.
Hope I could get you to decide.

Posted on Aug 29, 2010

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Upon installing these coils use dielectrical grease in the plug wire connections. This will keep all moister out

Posted on Aug 29, 2010

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