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      03-02-2013, 01:06 PM   #1
uberschnell
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How long do coils last?

I've got my original coils on my 08 with 64K miles on it. Not tuned. I'm getting what feels like light stuttering or misfires (rough acceleration) under WOT at higher rpm, especially going up a hill. Although it does not seem to affect performance (still pulls strong).

Had the carbon cleared out 20K ago and the plugs changed 10K ago. I understand it might be a coil, but before I go and troubleshoot it down to a specific coil should I just be looking at changing all of them due to age?

How long do you think our coils are good for?
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      03-02-2013, 01:17 PM   #2
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I would read codes if possible, then if one is faulty then just swap it with a good one if the problem moves replace it if it doesn't you have another issue. Injectors are a possibility with misfires.
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      03-02-2013, 01:31 PM   #3
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Quote:
Originally Posted by m7ammed View Post
Injectors are a possibility with misfires.


That was the case with mine. Throwing codes, car was running like crap (barely driveable) and it was an injector
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      03-03-2013, 02:05 AM   #4
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Also would like to add, that you even though you replaced plugs one could be faulty so don't rule it out. Did you replace with BMW ones? because from what I read is that you can get issues with non BMW ones.
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      03-03-2013, 02:22 AM   #5
uberschnell
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Quote:
Originally Posted by m7ammed View Post
Also would like to add, that you even though you replaced plugs one could be faulty so don't rule it out. Did you replace with BMW ones? because from what I read is that you can get issues with non BMW ones.
BMW ones done by BMW techs

Still, what's the lifespan of a BMW Coil?!
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      03-03-2013, 02:30 AM   #6
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Quote:
Originally Posted by MteK View Post
BMW ones done by BMW techs

Still, what's the lifespan of a BMW Coil?!
You'll know when you get persistent misfires on a cylinder that doesn't move unless you move the coil. I have 61k miles on mine and just recently had to replace cylinder 1 coil as it was faulty and giving me persistent misfires. All spark plugs were replaced about 6k miles ago.
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      03-03-2013, 03:05 AM   #7
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Quote:
Originally Posted by MteK View Post

Still, what's the lifespan of a BMW Coil?!
I think I saw in a Cobb video that they said its around 60K to 80K. I find that hard to believe at first, but our cars do go thru coils - you can see that by reading posts on our forum.






I think around that mileage it would be wise to change all the coils. Maybe do it with new spark plugs too.

At that mileage the injectors could be bad too. But generally you should change a coil first (or move it) and then an injector for that cylinder. Most opt for moving them first.

Carbon buildup could also cause a misfire too.
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      03-05-2013, 12:40 AM   #8
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Quote:
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I think I saw in a Cobb video that they said its around 60K to 80K. I find that hard to believe at first, but our cars do go thru coils - you can see that by reading posts on our forum.

I think around that mileage it would be wise to change all the coils. Maybe do it with new spark plugs too.

At that mileage the injectors could be bad too. But generally you should change a coil first (or move it) and then an injector for that cylinder. Most opt for moving them first.

Carbon buildup could also cause a misfire too.
Thanks, had the carbon cleaned about 20K ago. I'm looking for a used cobb to help me troubleshoot, but in the mean time I picked up a set of new coils for $230, so cheap insurance.
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      03-05-2013, 01:22 AM   #9
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Quote:
Originally Posted by MteK View Post
BMW ones done by BMW techs

Still, what's the lifespan of a BMW Coil?!
I had a coil blow on my S54 at 25k miles. There really is no set number for coil lifespan. People usually say 80k miles they are probably due.

Quote:
Originally Posted by MteK View Post
Thanks, had the carbon cleaned about 20K ago. I'm looking for a used cobb to help me troubleshoot, but in the mean time I picked up a set of new coils for $230, so cheap insurance.
Bosch coils are the best OEM to go with, just FYI
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      03-05-2013, 11:41 AM   #10
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Still can't find crap on the Okada coilpacks vs oem
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Originally Posted by Nate4641 View Post
looks like unicorn vomit.
Old| 2005 s2000: KPRO, Invidia q300 v4, PLM header, BERK 70mm HFC, Vortech v2 (3.6" Reichard Pulley), FMIC, ID 725cc (397whp/243tq @9psi), Tuned at Innovative Motorworks.
New| 2008 135i: PTF Tune, RB Turbos, ER CP, TiAL Q, BMS OCC, BMS DCI, AA 2.0 FMIC, VRSF 3" DPs, Berk Mids, CP-E Axleback, Robs' PCV.
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      03-05-2013, 08:33 PM   #11
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Quote:
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Still can't find crap on the Okada coilpacks vs oem
Seen this post?

http://www.e90post.com/forums/showthread.php?t=543138
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      03-05-2013, 10:38 PM   #12
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Quote:
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yea read through it. Didn't really help much with the reviews on them or how long they last/perform vs. oem. Reading that thread made me more terrified about a misfire occurring again for my car lol
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Originally Posted by Nate4641 View Post
looks like unicorn vomit.
Old| 2005 s2000: KPRO, Invidia q300 v4, PLM header, BERK 70mm HFC, Vortech v2 (3.6" Reichard Pulley), FMIC, ID 725cc (397whp/243tq @9psi), Tuned at Innovative Motorworks.
New| 2008 135i: PTF Tune, RB Turbos, ER CP, TiAL Q, BMS OCC, BMS DCI, AA 2.0 FMIC, VRSF 3" DPs, Berk Mids, CP-E Axleback, Robs' PCV.
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      05-18-2013, 08:50 PM   #13
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Quote:
Originally Posted by MteK View Post
Thanks, had the carbon cleaned about 20K ago. I'm looking for a used cobb to help me troubleshoot, but in the mean time I picked up a set of new coils for $230, so cheap insurance.
I'm having WOT problems with my '09 135i. I replaced the plugs with BMW originals and problems still with me but I have no dashboard indications. Did you replace your coils? If so, did that clear up your problems?
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      05-19-2013, 10:52 AM   #14
uberschnell
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I'm having WOT problems with my '09 135i. I replaced the plugs with BMW originals and problems still with me but I have no dashboard indications. Did you replace your coils? If so, did that clear up your problems?
It did. When I replaced the coils I noticed that the contacts on two of them where black and pitted. 65k on the original coils. I also felt an improvment on WOT acceleration on hot days.
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