Question about 2004 Mazda 6
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
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
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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Posted on Jan 02, 2017
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