DIY burnt out coil replacement
12-10-2007 | 08:00 PM
#26
Registered User
Joined: Sep 2003
Posts: 19
Likes: 0
I read this thread on Sunday - on Monday morning my 8 starts missing a few times - light comes on for a few seconds, clears, happens again a bit later!
I'm glad I read this thread - Centenary Mazda in Brisbane quote $180 each for coils - haven't confirmed that's the problem, but said it sure sounds like it.
Set of coils now on their way from the USA.
I'm glad I read this thread - Centenary Mazda in Brisbane quote $180 each for coils - haven't confirmed that's the problem, but said it sure sounds like it.
Set of coils now on their way from the USA.
12-11-2007 | 03:40 PM
#27
Registered User
Joined: Apr 2007
Posts: 575
Likes: 0
Cheers
Michael
12-13-2007 | 05:35 AM
#29
beers
12-14-2007 | 03:37 AM
#31
Registered User
Joined: Sep 2003
Posts: 19
Likes: 0
don't s'pose anyone has a spare set of coils! ):
Since Monday (see post above) the missing got progressively worse until today it wouldn't clear - wasn't game to keep driving so had the car towed to the dealer to make sure of the problem. Sure enough - 4 new coils needed - my coils left the US on Tuesday so hopefully should be here next week sometime, but with Christmas coming I have a bad feeling about the postal service!
So if anyone is interested in "dealing" in a spare set with me replacing them when mine get here please drop me a PM!
Since Monday (see post above) the missing got progressively worse until today it wouldn't clear - wasn't game to keep driving so had the car towed to the dealer to make sure of the problem. Sure enough - 4 new coils needed - my coils left the US on Tuesday so hopefully should be here next week sometime, but with Christmas coming I have a bad feeling about the postal service!
So if anyone is interested in "dealing" in a spare set with me replacing them when mine get here please drop me a PM!
12-21-2007 | 04:45 AM
#32
Hmmmmmm.........
Joined: Mar 2005
Posts: 3,564
Likes: 6
From: Melbourne, Australia
Another set of faulty coils fixed. I mailed Rick my OLD coils that were pretty ordinary yet they appear to have been better than what was in his car which says how bad they were.
Just counted between this and LittleJohns thread there are 12 people in the last 2 months who have had to replace their coils. All 03/04 cars.
Just counted between this and LittleJohns thread there are 12 people in the last 2 months who have had to replace their coils. All 03/04 cars.
Last edited by auzoom; 12-30-2007 at 08:52 PM.
12-30-2007 | 09:08 PM
#35
Extraordinary Engineering
Joined: Oct 2005
Posts: 4,733
Likes: 12
From: Burls On
I changed mine as preventive maintenance at 78000km and they looked like this (last picture)
https://www.rx8club.com/showpost.php...48&postcount=1
and I could not detect any difference.
Last edited by DarkBrew; 12-30-2007 at 09:21 PM.
12-30-2007 | 09:31 PM
#37
Mazsport.net
Joined: Mar 2005
Posts: 753
Likes: 0
From: In the shop
Hey guys, you may want to check this out.
https://www.rx8club.com/series-i-major-horsepower-upgrades-93/mazsport-ignition-solution-134081/
https://www.rx8club.com/series-i-major-horsepower-upgrades-93/mazsport-ignition-solution-134081/
12-30-2007 | 09:39 PM
#38
Extraordinary Engineering
Joined: Oct 2005
Posts: 4,733
Likes: 12
From: Burls On
Hey guys, you may want to check this out.
https://www.rx8club.com/showthread.php?t=134081
https://www.rx8club.com/showthread.php?t=134081
I'm good since I just replaced my coils but I'll be looking at the kit in about 75000 km.
01-08-2008 | 08:30 AM
#39
Registered User
Joined: Oct 2003
Posts: 2
Likes: 0
From: Carmel, NY
History lesson............
Part # N3H1-18-100
Original design coil that is failing on 03 + 04 cars
Part # N3H1-18-100-A
Updated coil stocked by Mazda Australia Stealerships. Used on all later cars
Offensive price please............ AU$160 ea
Note: Mazda USA price........... US$048 ea
Part # N3H1-18-100-9U
Updated coil available to the Mazda USA dealerships.
Awesome price please........... US$027 ea
Note: Mazda Oz price............ N/A
The "9U" in the part number usually means "Sourced in USA". Where as a "99" usually means "Sourced in Oz". As these coils are sourced in the USA, Mazda USA can bring them to market cheaper than the Mazda Japan sourced coils.
These coils are identical in appearence to the failing ones (as you would expect) & no "burnt out" issues have been reported with them yet but I suspect its too early to tell if they have the same failure rate as the originals. There is a minority of owners reporting CEL or other issues when installing new coils themselves but most of that minority report the proper "RESET" procedure clears it.
Guessing here but I suspect the ECU "learns" the current draw from the original coils & the new coils draw a significant difference thus exceeding a pre-programmed set point & logging it as a fault. The internal resistance of the failing coils would obviously be different to the new coils to cause this. So depending on how bad the originals where creates the "difference" & whether the ECU logs a CEL.
http://rotaryinsider.com/userpix/2_P1000343_1.jpg
http://rotaryinsider.com/userpix/2_P1000338_1.jpg
Am sure nobody here wants to pay the ridiculous Mazda Oz Stealership prices. Go online to purchase any RX-8 part including coils.
Click on the link here. >>> http://www.trademotion.com/partlocat...?siteid=214264 <<<
Once you have your coils you can replace them yourselves or get some mates around, worse still you can get your Stealership service dept. to replace them with your customer supplied "Genuine Mazda" coils & save yourself near $500 on the bill.
REgards
Part # N3H1-18-100
Original design coil that is failing on 03 + 04 cars
Part # N3H1-18-100-A
Updated coil stocked by Mazda Australia Stealerships. Used on all later cars
Offensive price please............ AU$160 ea
Note: Mazda USA price........... US$048 ea
Part # N3H1-18-100-9U
Updated coil available to the Mazda USA dealerships.
Awesome price please........... US$027 ea
Note: Mazda Oz price............ N/A
The "9U" in the part number usually means "Sourced in USA". Where as a "99" usually means "Sourced in Oz". As these coils are sourced in the USA, Mazda USA can bring them to market cheaper than the Mazda Japan sourced coils.
These coils are identical in appearence to the failing ones (as you would expect) & no "burnt out" issues have been reported with them yet but I suspect its too early to tell if they have the same failure rate as the originals. There is a minority of owners reporting CEL or other issues when installing new coils themselves but most of that minority report the proper "RESET" procedure clears it.
Guessing here but I suspect the ECU "learns" the current draw from the original coils & the new coils draw a significant difference thus exceeding a pre-programmed set point & logging it as a fault. The internal resistance of the failing coils would obviously be different to the new coils to cause this. So depending on how bad the originals where creates the "difference" & whether the ECU logs a CEL.
http://rotaryinsider.com/userpix/2_P1000343_1.jpg
http://rotaryinsider.com/userpix/2_P1000338_1.jpg
Am sure nobody here wants to pay the ridiculous Mazda Oz Stealership prices. Go online to purchase any RX-8 part including coils.
Click on the link here. >>> http://www.trademotion.com/partlocat...?siteid=214264 <<<
Once you have your coils you can replace them yourselves or get some mates around, worse still you can get your Stealership service dept. to replace them with your customer supplied "Genuine Mazda" coils & save yourself near $500 on the bill.
REgards
01-15-2008 | 11:55 PM
#40
Thread Starter
Registered User
Joined: Aug 2003
Posts: 782
Likes: 0
From: Sydney, Australia
Thanks very much for the info. Do you think they suffer from too much heat? I've had a slight roughness at idle for quite some time, and I noticed my gas mileage had been dropping off. Then the roughness got really bad with loss of power just recently, but the weather has been quite cold, and if anything, for the short driving I've been doing lately, the car doesn't even get warm. I am have the work done at the dealer, not cheap, but don't have time to do it myself rignt now. I'll let you know how it turns out.
These coils do suffer severly from heat stress. Very small & high output means plenty of heat & little mass to radiate it effectively.
The "heatsink" idea is not the solution but it sure does help. Buy a set of coils (on-line) & have them fitted, especially if you have an 03 or 04 model with a few KM on the clock as they would be failing or ready to fail anytime.
However, your symptoms read more like fouling plugs as you mentioned the magic words
I noticed my gas mileage had been dropping off
for the short driving I've been doing lately, the car doesn't even get warm
REgards
01-23-2008 | 07:27 AM
#41
Registered
Joined: Jun 2006
Posts: 427
Likes: 1
From: Europe - Greece
So guys I have at about 50.000Km with the original coils with no problem. I have already bought a set of 9U. When do you think it is most appropriate to change my coils? Now? or wait it 70.000km?
01-23-2008 | 03:18 PM
#43
Hmmmmmm.........
Joined: Mar 2005
Posts: 3,564
Likes: 6
From: Melbourne, Australia
I think most people dont realise just how down on power they are because of the coils. If you can do it yourself then I would recommend at least seeing what the car islike with new ones. If its no difference then put the old ones back and wait.
If you cant do it yourself and you dont think anything is worng then just wait.
Cheers
Andrew
If you cant do it yourself and you dont think anything is worng then just wait.
Cheers
Andrew
01-24-2008 | 01:49 AM
#44
Registered
Joined: Jun 2006
Posts: 427
Likes: 1
From: Europe - Greece
I think most people dont realise just how down on power they are because of the coils. If you can do it yourself then I would recommend at least seeing what the car islike with new ones. If its no difference then put the old ones back and wait.
If you cant do it yourself and you dont think anything is worng then just wait.
Cheers
Andrew
If you cant do it yourself and you dont think anything is worng then just wait.
Cheers
Andrew
Is it any chance that my coils are bad and not knowing it? I mean to have lost a fraction of power without even noticing it?
I am asking that because most of the people with failed coils see noticeable problems in power , cells etc
01-24-2008 | 06:05 AM
#45
Hmmmmmm.........
Joined: Mar 2005
Posts: 3,564
Likes: 6
From: Melbourne, Australia
When I changed mine I actually didnt realise how bad they were. I just made the decision that because I did a lot of track days I would have them handy. When they turned up I figured I would do what I mentioned above...try them and see how they differed. Turned out it was significant enough that I noticed, so I left them in.
Cheers
Andrew
Cheers
Andrew
02-18-2008 | 11:21 PM
#47
Registered User
Joined: Jun 2007
Posts: 3
Likes: 0
hey guys, just wanted to check if this is the right coil replacement as i will be supplying 4 coils to my local dealership.
"Part number N3H1181009U was superceded by part number N3H118100A9U."
the search came up with 3 items in different catergories.
Cheers
akira
"Part number N3H1181009U was superceded by part number N3H118100A9U."
the search came up with 3 items in different catergories.
Cheers
akira
02-20-2008 | 07:31 AM
#50
As per the mazda service schedule spark plugs should be changed every 35000 miles.
Should the coils be changed at the same time?
It seems like everyone has to change these suckers at some point when would be the proper time to replace. I would rather replace them under my watch then to be stuck in 'limp mode' on the side of a highway, especially for something relatively inexpensive.
Should the coils be changed at the same time?
It seems like everyone has to change these suckers at some point when would be the proper time to replace. I would rather replace them under my watch then to be stuck in 'limp mode' on the side of a highway, especially for something relatively inexpensive.