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      11-29-2012, 12:20 PM   #1
bimmertt
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What causes ignition coils to go bad?

I have been driving around with the low pressure fuel sensor fault for the past 1000-2000 miles. My car randomly started misfiring the other day when I would try to go WOT. I swapped ignition coils and the misfire followed the coil so it seems like the coil has gone bad. Could the faulty low pressure fuel sensor be the cause of this? If not, how else could the coil go bad? I'm only wondering because my car has relatively low mileage. I also haven't heard of many ignition coil failures on this board.
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      11-29-2012, 12:27 PM   #2
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Quote:
Originally Posted by bimmertt View Post
How else could the coil go bad? I'm only wondering because my car has relatively low mileage. I also haven't heard of many ignition coil failures on this board.
The coils internal resistance keeps increasing with use, if the metal inside has any flaws or imperfections it will ware faster and fail prematurely, thatís why itís often you have one coil go bad at 40-50K miles but the rest last to 120K
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      11-29-2012, 12:38 PM   #3
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Quote:
Originally Posted by CHECKERED View Post
The coils internal resistance keeps increasing with use, if the metal inside has any flaws or imperfections it will ware faster and fail prematurely, thatís why itís often you have one coil go bad at 40-50K miles but the rest last to 120K
I'm hoping that is the case because I just ordered one. I will try to see if there is any way to inspect the bad one when I replace it.
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      11-29-2012, 12:53 PM   #4
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Quote:
Originally Posted by CHECKERED View Post
The coils internal resistance keeps increasing with use, if the metal inside has any flaws or imperfections it will ware faster and fail prematurely, that’s why it’s often you have one coil go bad at 40-50K miles but the rest last to 120K
Well said. Just like any part usage will cause it to wear. The 335i is notorious for faulty coil packs here and there so in this case there is nothing to blame except manufacturers defect. with a high mileage car it's to be expected though. Some Audi's are notorious for literally eating coilpacks sometimes on a monthly basis. If the misfire follows the coil it needs replacement more times then not.
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      11-29-2012, 02:14 PM   #5
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Is the rate of wear on the coils such that it makes sense to replace all six of them at high mileage instead of waiting for them to fail one by one? I was considering doing all of them with my next round of spark plugs because by then the car will be around 80000 miles, tuned since 30000 with meth since 55000. Since I'll be keeping the car for at least the next few years, it seems like it would be easiest to do them preventatively unless it's a waste.
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      11-29-2012, 02:25 PM   #6
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I got missfire cylinder 2, I swapped 1 & 2 it's been fine for a couple weeks, but got another missfire on 2 again spark plug? or injector?
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      11-29-2012, 02:41 PM   #7
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Quote:
Originally Posted by nailer335
Is the rate of wear on the coils such that it makes sense to replace all six of them at high mileage instead of waiting for them to fail one by one? I was considering doing all of them with my next round of spark plugs because by then the car will be around 80000 miles, tuned since 30000 with meth since 55000. Since I'll be keeping the car for at least the next few years, it seems like it would be easiest to do them preventatively unless it's a waste.
Seems like a waste to me. They are not very cheap. Cheapest I found was $235 for all 6.
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      11-29-2012, 02:50 PM   #8
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Just replace them as they go, who knows one could make it 50,000 miles and one could make it 10 miles from now
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      11-30-2012, 10:01 AM   #9
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our cars like to play guessing games
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      11-30-2012, 05:16 PM   #10
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Im at 44k 4 coil packs replaced already
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      11-30-2012, 05:25 PM   #11
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I just replaced all 6 and the car runs like a champ now, no misfires. If you deduce the misfires from coils that are 50k or newer, you might want to find the faulty one. I'm at 82k with originals so I just went ahead an replaced them all in one shot.
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      11-30-2012, 05:39 PM   #12
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Quote:
Originally Posted by nailer335 View Post
Is the rate of wear on the coils such that it makes sense to replace all six of them at high mileage instead of waiting for them to fail one by one? I was considering doing all of them with my next round of spark plugs because by then the car will be around 80000 miles, tuned since 30000 with meth since 55000. Since I'll be keeping the car for at least the next few years, it seems like it would be easiest to do them preventatively unless it's a waste.
I'm with ya. I'm only at 33k but around 50K I'll probably just replace all of mine. 235 dollars is a small price to pay for peace of mind. I fully believe in preventative maintenance. Change plugs every 10k and only every 3k for me.
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      12-02-2012, 01:03 AM   #13
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Quote:
Originally Posted by smi1gj View Post
I'm with ya. I'm only at 33k but around 50K I'll probably just replace all of mine. 235 dollars is a small price to pay for peace of mind. I fully believe in preventative maintenance. Change plugs every 10k and only every 3k for me.
Well that makes two of us then, I'm not trying to cut corners on any maintenance (preventative or reactive) or fluids when changing the performance specifications of my car as much as I do. $235 for new coils is easy, especially since its a simple DIY along with the plugs. It makes no sense to know that you're close to a given parts known limits, and ride it out and then replace the six of them one by one.

Sometimes I'm tempted to do the injectors and the HPFP when I think about doing all of my coils and plugs. If I were to go that far, Terry's in tank Walbro seems like a logical addition too. At that point, might as well do the flash to ramp up the E85%. Damn... this really is a slippery slope isn't it
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      12-02-2012, 02:20 AM   #14
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I think the first batch or higher mileage cars are starting to be hit hard with intake valve carbed up causing these errors.
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      12-02-2012, 04:22 AM   #15
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the extreme load our engines encounter with larger amounts of boost than stock , more boost = more load which puts more strain on the ignintion system ........ we need a msd version or xyz brand of HD coil
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      12-02-2012, 04:25 AM   #16
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i have found that dialectric grease helps !
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      12-02-2012, 09:42 AM   #17
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Does anyone make aftermarket Coil Packs for the N54?
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      12-02-2012, 10:04 AM   #18
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Does anyone make aftermarket Coil Packs for the N54?
They do but it's hella expensive and I'm not sure they're any better than the stock ones.

http://www.horsepowerfreaks.com/part...a_Direct/11111
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      01-04-2013, 09:20 AM   #19
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Where are you guys buying the coil packs? I want to replace mine, but not sure where to buy them from and which reference. Any help would be appreciated.
If you want to email them to me- its zuluaga14@hotmail.com

thanks!
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      01-04-2013, 11:52 AM   #20
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$1200 dollar ignition coils holy ****. Has anyone attempted to clean their coils at all? If wo how?
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      01-04-2013, 12:07 PM   #21
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Quote:
Originally Posted by Zuluaga View Post
Where are you guys buying the coil packs? I want to replace mine, but not sure where to buy them from and which reference. Any help would be appreciated.
If you want to email them to me- its zuluaga14@hotmail.com

thanks!
ECS Tuning sells them.
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      03-24-2013, 11:25 PM   #22
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Bimmertt - Did you ever find out the correlation to the low fuel pressure sensor fault??? I am seeing the same issue with mine and was hoping you would have some advice...
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