Do N54 coils get weak over time or completely go out ??

all4bspinnin · 08-14-2015, 08:10 PM

Hi all,

Im trying to track down why my 135i is having part throttle low rpm timing corrections. Full throttle the car pulls fine with 0 knock.

When daily driving in traffic, the car is pulling as much as -9.0 on cylinder 1 and as high as 7.0 on other cylinders. Ive had the walnut shell blasting done and installed NGK 5992s (gapped to .022) and that eliminated misfires and limp mode and the car runs waaaay better. But the part throttle, low rpm, stuff is acting up.

The car has a cobb ap, AFE DCI (open air), and a 3inch catback, fmic, charge pipe w/ HKS BOV, stock downpipes.

It has 82k miles.

Im running cobb ap stage 1 sport ST v401

Im trying to determine if the coil packs are getting weak due to age/mileage or if its something else like injectors.

Any ideas? Do these coil packs get weak over time?

Pig Farmer · 08-14-2015, 08:51 PM

My experience is that the coil packs get progressively weaker, but fail shortly after you start to notice any misfires. The first coil that failed on me would only act up at WOT... which is probably more common as there is less time for the coil to "recharge" before firing. I've also had one fail where it would only act up just above idle. The car would shake like crazy until 1,500 RPMs, then smooth out. That coil died completely within a few hours.

all4bspinnin · 08-14-2015, 09:47 PM

PigFarmer... thank you for the reply.

I was wondering if that was the case. I was thinking that the coils are weak too because as the rpms go up, the voltage may increase or something and thats why it has issues down low. Im probably off on that one...

all4bspinnin · 08-14-2015, 09:48 PM

Any other ideas as to why the timing is being corrected so much at low rpm & light pedal?

BMW135pls · 08-15-2015, 09:08 PM

Quote:

Originally Posted by Pig Farmer

My experience is that the coil packs get progressively weaker, but fail shortly after you start to notice any misfires. The first coil that failed on me would only act up at WOT... which is probably more common as there is less time for the coil to "recharge" before firing. I've also had one fail where it would only act up just above idle. The car would shake like crazy until 1,500 RPMs, then smooth out. That coil died completely within a few hours.

Thanks for this. My own situation mirrors what I guess would be the early stages of coil failure. I have misfires on WOT high RPM pulls only. No issues on idle or street driving. I just bought a round of plugs to sort this out, but I guess I'll have to buy the coils too... Where should I get the coils, and are OEM coils good enough for high boost and power? People recommended to use non-OE plugs for high boost, so are coils the same way?

saace7 · 08-16-2015, 09:38 AM

ecstuning.com

http://www.ecstuning.com/BMW-E82-135...ion/ES2581741/

edit: ^^ this comes with spark plugs.

this is for the n54 motor. the BMW brand is 100 bucks more. OE BMW and Bosch are the same.

all4bspinnin · 08-16-2015, 02:11 PM

So you guys with coil issues are only having problems up top? My car pulls fine with no knock up top.

08-14-2015, 08:10 PM	#1
all4bspinnin Second Lieutenant 38 Rep 206 Posts Drives: 09 135i LeMans Blue/Terracota Join Date: May 2015 Location: Jax, FL iTrader: (0)	Do N54 coils get weak over time or completely go out ?? Hi all, Im trying to track down why my 135i is having part throttle low rpm timing corrections. Full throttle the car pulls fine with 0 knock. When daily driving in traffic, the car is pulling as much as -9.0 on cylinder 1 and as high as 7.0 on other cylinders. Ive had the walnut shell blasting done and installed NGK 5992s (gapped to .022) and that eliminated misfires and limp mode and the car runs waaaay better. But the part throttle, low rpm, stuff is acting up. The car has a cobb ap, AFE DCI (open air), and a 3inch catback, fmic, charge pipe w/ HKS BOV, stock downpipes. It has 82k miles. Im running cobb ap stage 1 sport ST v401 Im trying to determine if the coil packs are getting weak due to age/mileage or if its something else like injectors. Any ideas? Do these coil packs get weak over time?
	Appreciate 0 Tweet Quote

08-14-2015, 08:51 PM	#2
Pig Farmer Major 340 Rep 1,293 Posts Drives: E92M Join Date: May 2010 Location: Florida iTrader: (0)	My experience is that the coil packs get progressively weaker, but fail shortly after you start to notice any misfires. The first coil that failed on me would only act up at WOT... which is probably more common as there is less time for the coil to "recharge" before firing. I've also had one fail where it would only act up just above idle. The car would shake like crazy until 1,500 RPMs, then smooth out. That coil died completely within a few hours.
	Appreciate 1 Quote

08-14-2015, 09:47 PM	#3
all4bspinnin Second Lieutenant 38 Rep 206 Posts Drives: 09 135i LeMans Blue/Terracota Join Date: May 2015 Location: Jax, FL iTrader: (0)	PigFarmer... thank you for the reply. I was wondering if that was the case. I was thinking that the coils are weak too because as the rpms go up, the voltage may increase or something and thats why it has issues down low. Im probably off on that one...
	Appreciate 0 Quote

08-14-2015, 09:48 PM	#4
all4bspinnin Second Lieutenant 38 Rep 206 Posts Drives: 09 135i LeMans Blue/Terracota Join Date: May 2015 Location: Jax, FL iTrader: (0)	Any other ideas as to why the timing is being corrected so much at low rpm & light pedal?
	Appreciate 0 Quote

08-16-2015, 09:38 AM	#6
saace7 Private 7 Rep 90 Posts Drives: OneThreeFive Join Date: May 2013 Location: the world iTrader: (0)	ecstuning.com http://www.ecstuning.com/BMW-E82-135...ion/ES2581741/ edit: ^^ this comes with spark plugs. this is for the n54 motor. the BMW brand is 100 bucks more. OE BMW and Bosch are the same.
	Appreciate 1 Quote

08-16-2015, 02:11 PM	#7
all4bspinnin Second Lieutenant 38 Rep 206 Posts Drives: 09 135i LeMans Blue/Terracota Join Date: May 2015 Location: Jax, FL iTrader: (0)	So you guys with coil issues are only having problems up top? My car pulls fine with no knock up top.
	Appreciate 0 Quote