Mazda 'C' Ignition Coils...Updated.
#30
So when I opened the box I found that the coils inside has the 'C' part number stamped onto them, while the box was labelled 'B'. I guess I lucked out. Aside from that, the coils looked physically identical to the 'B' coils I removed from the car.
#32
Coil order
Does anyone know the order these coils go? My mechanic tells me ignition coil A is causing engine light to come on. Is this the one nearest the front of the car or the bulkhead?
Driving a 2003 RX8 imported from Japan.
Appreciate any help/guidance out there
Tom
Driving a 2003 RX8 imported from Japan.
Appreciate any help/guidance out there
Tom
#33
Paul.
#34
Super Moderator
Thread Starter
As always sound advice from Paul @ Mazmart....
Tom, I would be buying all 4 new OEM 'C' iteration Coils from Paul..
Tom, I would be buying all 4 new OEM 'C' iteration Coils from Paul..
#35
Thanks lads.
I bought a set of coils (100C), leads and plugs (NGK) online recently and my mechanic fitted them but engine light remained on and diagnostic said fault with all four ignition coils! They came in Mazda original parts boxes and supplied by UK dealer on eBay...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=251258753335
Re-fitted old ones and issue reverted to one faulty coil...this time coil A (prev ign coil B - unlikely to have replaced coils exactly suggesting just one acting up)
Appreciate it is worth replacing all four which is what I have intended to do. Also wondered if system recognises new C coils?
Will revert to seller.
Thanks again for help.
I bought a set of coils (100C), leads and plugs (NGK) online recently and my mechanic fitted them but engine light remained on and diagnostic said fault with all four ignition coils! They came in Mazda original parts boxes and supplied by UK dealer on eBay...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=251258753335
Re-fitted old ones and issue reverted to one faulty coil...this time coil A (prev ign coil B - unlikely to have replaced coils exactly suggesting just one acting up)
Appreciate it is worth replacing all four which is what I have intended to do. Also wondered if system recognises new C coils?
Will revert to seller.
Thanks again for help.
#38
Out of NYC
iTrader: (1)
Just wanna update this to whoever search and came into this thread
MNAO will NOT change the part number, I think they are just being lazy, now most if not all of the so called 100B-9U coils u get from MNAO are C inside the box, they actually just label the C over with their own 100B-9U label.
I installed at least 30 sets of C coils into people's car, so far so good, some got over 20K out of it already with no signs of failure, well of course even B doesn't fail that fast. but it does seem that it will last longer than B.
MNAO will NOT change the part number, I think they are just being lazy, now most if not all of the so called 100B-9U coils u get from MNAO are C inside the box, they actually just label the C over with their own 100B-9U label.
I installed at least 30 sets of C coils into people's car, so far so good, some got over 20K out of it already with no signs of failure, well of course even B doesn't fail that fast. but it does seem that it will last longer than B.
#39
Just wanna update this to whoever search and came into this thread
MNAO will NOT change the part number, I think they are just being lazy, now most if not all of the so called 100B-9U coils u get from MNAO are C inside the box, they actually just label the C over with their own 100B-9U label.
I installed at least 30 sets of C coils into people's car, so far so good, some got over 20K out of it already with no signs of failure, well of course even B doesn't fail that fast. but it does seem that it will last longer than B.
MNAO will NOT change the part number, I think they are just being lazy, now most if not all of the so called 100B-9U coils u get from MNAO are C inside the box, they actually just label the C over with their own 100B-9U label.
I installed at least 30 sets of C coils into people's car, so far so good, some got over 20K out of it already with no signs of failure, well of course even B doesn't fail that fast. but it does seem that it will last longer than B.
#45
Super Moderator
Thread Starter
Leads/Wires looked fine (almost brand new externally) and I know that is not the proper way to judge/test them...IMO Leads get changed too often.
Did a full service and a recondition charge of my original almost 7 year old Panasonic Battery as my RX-8 was off the road for almost a year while using my NC.
Anyway she fired up for the first time like it was new, actually faster than my NC.
The 4 old Coils, not a mark on them (not that this is an indicator).
As for owners having one faulty OEM Coil early on in cars life, well I have not heard of very often, in fact I think this is the first time I have and I guess like anything can fail.
All good...now to enjoy my 8 during winter here in OZ.
#46
I did not feel or notice anything wrong with my original s2 "B" coils at 30k and a little over 3yrs, but after changing them my dyno plot looked much better. This was not a back to back test, so it could have been something else, but coils were the only thing that physically changed on the car.
The replacements were "c" even though they had "b" on the box. After almost 2yrs and 20k I did not notice anything wrong with them (including in my butt dyno and straight line speed on track). I was planning to dyno them in the next couple of months to see how they had held up, however, now that my engine is out I am replacing them. The replacements that came though a US dealer are "c" coils again even though "c" is not on the box. I'm slso doing plugs and leads at the same time (I did not do leads last time, so they were still original).
One thing I noticed - one of my plugs has a corroded top. There was also one with a corroded top the 1st time I changed them. Seems a little odd to me so hopefully new leads helps. The plugs overall look like I left them a bit long as well (~22k and 2yrs).
After all this, I'm thinking that 1yr/10k on plugs, 2yrs/20k on "C" coils and 3yrs/30k on leads is a pretty safe maintenance schedule.
I've also ordered coils for our Civic Si - it is on the original ones after 7yrs and 94k, but it seems to be knocking more than I remember now so hoping this helps.
The replacements were "c" even though they had "b" on the box. After almost 2yrs and 20k I did not notice anything wrong with them (including in my butt dyno and straight line speed on track). I was planning to dyno them in the next couple of months to see how they had held up, however, now that my engine is out I am replacing them. The replacements that came though a US dealer are "c" coils again even though "c" is not on the box. I'm slso doing plugs and leads at the same time (I did not do leads last time, so they were still original).
One thing I noticed - one of my plugs has a corroded top. There was also one with a corroded top the 1st time I changed them. Seems a little odd to me so hopefully new leads helps. The plugs overall look like I left them a bit long as well (~22k and 2yrs).
After all this, I'm thinking that 1yr/10k on plugs, 2yrs/20k on "C" coils and 3yrs/30k on leads is a pretty safe maintenance schedule.
I've also ordered coils for our Civic Si - it is on the original ones after 7yrs and 94k, but it seems to be knocking more than I remember now so hoping this helps.
Last edited by blu3dragon; 05-16-2015 at 10:32 AM.
#47
Water Foul
The one that failed on me was the trailing on the rear rotor. I noticed a slight change in performance, pulled the plugs, and found a wet one. I tested that coil by swapping it to the other rotor. The problem followed the coil, which ruled out the plug and lead. Rather than play Russian Roulette with replacement coils, I just opted for a BHR setup. No problems with that so far.
#48
Super Moderator
Thread Starter
The one that failed on me was the trailing on the rear rotor. I noticed a slight change in performance, pulled the plugs, and found a wet one. I tested that coil by swapping it to the other rotor. The problem followed the coil, which ruled out the plug and lead. Rather than play Russian Roulette with replacement coils, I just opted for a BHR setup. No problems with that so far.
The improving/internal updates of OE Coils from S1 have seen a better life.
There have been 4 iterations from 2004MY.
#50
The Michigan "WANKEL"
I have been noticing that my RX-8 doesn't seem quite as fast as it should. Usually that goes away with new plugs (which were done right before garaging it last fall), but this spring it's still feeling slower than it used to. I guess I'll be looking at replacing the coils soon. I also need new tires, and will almost certainly have to replace my brake pads after my first track day this Saturday. Ouch.