BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > DIY Guides/ Discussions
 
Evolve Automotive
Post Reply
 
Thread Tools Search this Thread
      02-22-2015, 09:44 AM   #1
MTM
Second Lieutenant
3
Rep
230
Posts

Drives: 2009 M3
Join Date: Sep 2011
Location: Houston

iTrader: (0)

Ignition Coils part of Preventative Maintenance?

Just curious to see if anyone replaces their ignition coils on a preventative basis...or does everyone tend to wait until they have a fault? Am replacing spark plugs soon (2009 E92 M3 with 65k miles) and want to get a feel for what the experience has been on the forum.
Appreciate 0
      02-22-2015, 11:42 AM   #2
pbonsalb
Lieutenant Colonel
30
Rep
1,926
Posts

Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

I would not. Have not read of them as a failure item. Would expect them to last 100k minimum.
Appreciate 0
      02-22-2015, 12:16 PM   #3
///M Ryder
Grown Azz Man
///M Ryder's Avatar
United_States
52
Rep
2,671
Posts

Drives: 2011.5 Dinan ///M3
Join Date: Dec 2010
Location: Sugar Land

iTrader: (5)

Quote:
Originally Posted by MTM View Post
Just curious to see if anyone replaces their ignition coils on a preventative basis...or does everyone tend to wait until they have a fault? Am replacing spark plugs soon (2009 E92 M3 with 65k miles) and want to get a feel for what the experience has been on the forum.
I just replaced all 8 of mine a couple of weeks ago. Last track day car went into limp mode. Codes were multiple misfires but it turned out to be the idle control actuator. With 51k on the car I figured it was about time. These coils are expensive but you won't really know they're bad unless the car is being driven under a heavy load.....ie....track day. After I got home from the track the car ran like new money under daily driving conditions. Also, you can get the plugs from O'Reilly for about $13 each. If you need help with the job holla at me...................Phil
__________________
2011.5 E92 Dinan///M3: SSII DCT- Comp, Prem 2, Conv Pkg, Heated Seats, Enhanced Prem Sound, Edition Grills/Gills, M Perf Steering Wheel, C/F Perf Spoiler, BMW Pedals, Dinan Exhaust, Dinan X-Pipe, Dinan C/F Intake, Dinan Software Tune, Dinan DCT Tune, Dinan Pulley Kit, Dinan CH-R Wheels, Dinan C/F Strut Tower Braces, Arkym Lip, IND M5 Mirror Caps, Carbon Reflectors, Lux H8 V3, Brembo 365mm BBK, Swift Spec-R Springs + Track Gear
Appreciate 0
      02-22-2015, 12:16 PM   #4
SenorFunkyPants
Colonel
SenorFunkyPants's Avatar
United Kingdom
48
Rep
2,785
Posts

Drives: E92 DCT M3
Join Date: Mar 2009
Location: UK

iTrader: (0)

Doesn't seem like a common problem...although one persons UK engine failure was attributed to a failed coil detonating the crap out of that cylinder including the rod bearing.
I would hope though that you would be able to hear and feel if a coil had failed and your engine was pinging.
__________________
Appreciate 0
      02-22-2015, 12:25 PM   #5
///M Ryder
Grown Azz Man
///M Ryder's Avatar
United_States
52
Rep
2,671
Posts

Drives: 2011.5 Dinan ///M3
Join Date: Dec 2010
Location: Sugar Land

iTrader: (5)

Quote:
Originally Posted by SenorFunkyPants View Post
Doesn't seem like a common problem...although one persons UK engine failure was attributed to a failed coil detonating the crap out of that cylinder including the rod bearing.
I would hope though that you would be able to hear and feel if a coil had failed and your engine was pinging.
The problem with these coils is.....once they cool off they won't fail again until they're really hot. And it takes some hard driving to heat them to that point. I've experienced it and have been told this by a BMW shop foreman and the regional tech person..........Phil
__________________
2011.5 E92 Dinan///M3: SSII DCT- Comp, Prem 2, Conv Pkg, Heated Seats, Enhanced Prem Sound, Edition Grills/Gills, M Perf Steering Wheel, C/F Perf Spoiler, BMW Pedals, Dinan Exhaust, Dinan X-Pipe, Dinan C/F Intake, Dinan Software Tune, Dinan DCT Tune, Dinan Pulley Kit, Dinan CH-R Wheels, Dinan C/F Strut Tower Braces, Arkym Lip, IND M5 Mirror Caps, Carbon Reflectors, Lux H8 V3, Brembo 365mm BBK, Swift Spec-R Springs + Track Gear
Appreciate 0
      02-22-2015, 01:51 PM   #6
MTM
Second Lieutenant
3
Rep
230
Posts

Drives: 2009 M3
Join Date: Sep 2011
Location: Houston

iTrader: (0)

Thanks, Gents. Will hold off until I start committing to some track time (darn sailing addiction and tuition payments for my son keep distracting me!).
Appreciate 0
      02-22-2015, 03:11 PM   #7
Richbot
Colonel
38
Rep
2,192
Posts

Drives: Jerez Black E90
Join Date: Sep 2007
Location: STL

iTrader: (2)

Coils, no matter who makes them, do lose some power over time from heat and cycles, and the older they are the less they can hold up to long periods of high load, but it's not likely to cause much of a problem on a street car. IIRC the guys runing these cars in Grand Am weren't replacing coils very often, or at all, it was one of the questions I asked in the pits. I'm replacing mine at 75k but I'm going to keep the used ones as known good spares. I doubt they're appreciably worse than new but I'm going to be doing plugs anyway and it takes no extra time at all to put new ones in (plus I'm likely to break at least one getting them out because I'm a hack). I've no doubt they'd likely all make it for a long time, but I'm one of those guys whose M3 has been so reliable he's having to hunt for things to spend the "M cars need lots of maintenance" budget on...

These cars are pretty good about yelling at you when a coil is starting to go bad, it will throw a cylinder-specific code. The only real driveline "repair" my car has had in 68,000 miles was a #5 coil replaced under the factory warranty. No symptoms, car ran fine, but when it was pulled it had started to swell

Somebody did a study on GM's LS3 coils (popular retrofit) and found they tend to fall off after a certain amount of time in service.
__________________

Last edited by Richbot; 02-22-2015 at 03:19 PM.
Appreciate 0
      02-22-2015, 03:32 PM   #8
///M Ryder
Grown Azz Man
///M Ryder's Avatar
United_States
52
Rep
2,671
Posts

Drives: 2011.5 Dinan ///M3
Join Date: Dec 2010
Location: Sugar Land

iTrader: (5)

Quote:
Originally Posted by Richbot View Post
Coils, no matter who makes them, do lose some power over time from heat and cycles, and the older they are the less they can hold up to long periods of high load.......I'm going to keep the used ones as known good spares.
+1.....got the old ones on standby....................Phil
__________________
2011.5 E92 Dinan///M3: SSII DCT- Comp, Prem 2, Conv Pkg, Heated Seats, Enhanced Prem Sound, Edition Grills/Gills, M Perf Steering Wheel, C/F Perf Spoiler, BMW Pedals, Dinan Exhaust, Dinan X-Pipe, Dinan C/F Intake, Dinan Software Tune, Dinan DCT Tune, Dinan Pulley Kit, Dinan CH-R Wheels, Dinan C/F Strut Tower Braces, Arkym Lip, IND M5 Mirror Caps, Carbon Reflectors, Lux H8 V3, Brembo 365mm BBK, Swift Spec-R Springs + Track Gear
Appreciate 0
      02-22-2015, 04:20 PM   #9
SenorFunkyPants
Colonel
SenorFunkyPants's Avatar
United Kingdom
48
Rep
2,785
Posts

Drives: E92 DCT M3
Join Date: Mar 2009
Location: UK

iTrader: (0)

Its the anti knock sensor in the coil that I would be concerned about.
__________________
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 06:17 AM.




m3post
m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST