2 Coil packs in one year....36k miles

Kayven128i · 01-12-2019, 09:19 AM

Isn't that a little odd? I had Cylinder 4 Coil done by an indy, but then I read about the SULEV 15 yr/150k warranty. Called dealership this week 2 times and no SA returns my calls.

So I'm thinking maybe I'll DIY. Should I change the spark plug and coil? The code i'm getting reads Cylinder 2 misfire.

I also have had an oil leak, dealer just replaced oil filter gasket housing but said there is a "seep" in the oil pan gasket I believe, I have oil all over the undercarriage piece.

What brand coil should I get, Bosch?

captain slowly · 01-12-2019, 11:55 AM

you probably should change all six coil packs and plugs, as for brand, either ngk or bosch.

MightyMouseTech · 01-12-2019, 03:16 PM

Never recommended to replace just one coil. Should always replace all six. A bad coil can fry the DME. Don't risk it.

tock172 · 01-12-2019, 04:26 PM

Your coil are getting old and suffering attrition from age as opposed to use cycles. Unless you want to continue replacing them one by one, shell out for the entire lot as others have said and be done with it.

I'm getting close to doing this on my car. Every now and again I can detect a slight misfire that's not persistent enough to throw a CEL. Eventually I'll either replace all the coils or warranty them.

olds350 · 01-13-2019, 10:18 AM

The Bosch coils on these cars are notorious for going bad. Buy a set of Delphi's and be done with it. I had to replace all of mine at 37k miles. Had one going bad and once I got into the job I saw where someone had already replaced another coil. Been running fine so far, but it only has ~1500 miles since the swap.

QuebecDIY · 01-13-2019, 09:30 PM

What I personally do in such a case...
Swap coil 3 and 4
Erase codes
Run the engine

If you still have miss fire, check which cylinder.
If miss fire on cyl 4, defective coil pack
If still cylinder 3, check to push it a bit more, else might be your spark plug.

Also, pay attention... I read somewhere that if you have oil or other liquid it might creates miss fire with those coil packs.

01-12-2019, 09:19 AM	#1
Kayven128i Private 28 Rep 53 Posts Drives: 2011 Alpine White 128i Join Date: May 2010 Location: PA iTrader: (0)	2 Coil packs in one year....36k miles Isn't that a little odd? I had Cylinder 4 Coil done by an indy, but then I read about the SULEV 15 yr/150k warranty. Called dealership this week 2 times and no SA returns my calls. So I'm thinking maybe I'll DIY. Should I change the spark plug and coil? The code i'm getting reads Cylinder 2 misfire. I also have had an oil leak, dealer just replaced oil filter gasket housing but said there is a "seep" in the oil pan gasket I believe, I have oil all over the undercarriage piece. What brand coil should I get, Bosch?
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01-12-2019, 11:55 AM	#2
captain slowly I like turtles! 726 Rep 698 Posts Drives: '21 M2C 6MT Join Date: Feb 2017 Location: Long Island, NY iTrader: (0)	you probably should change all six coil packs and plugs, as for brand, either ngk or bosch.
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01-12-2019, 03:16 PM	#3
MightyMouseTech Major General 4338 Rep 6,196 Posts Drives: 13 135i 6MT LeMans Blue MSport Join Date: Feb 2013 Location: Ottawa, Canada iTrader: (0)	Never recommended to replace just one coil. Should always replace all six. A bad coil can fry the DME. Don't risk it.
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01-12-2019, 04:26 PM	#4
tock172 Beachtown Bill Collector 582 Rep 1,062 Posts Drives: 2012 135i Join Date: May 2011 Location: San Diego iTrader: (1) Garage List 2012 BMW 135i [0.00] 1999 Lexus LS400 [0.00] 1985 BMW 325e [0.00]	Your coil are getting old and suffering attrition from age as opposed to use cycles. Unless you want to continue replacing them one by one, shell out for the entire lot as others have said and be done with it. I'm getting close to doing this on my car. Every now and again I can detect a slight misfire that's not persistent enough to throw a CEL. Eventually I'll either replace all the coils or warranty them. __________________ 2012 BMW 135i Space Grey Metallic M-Sport DCT Dinan S2
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01-13-2019, 10:18 AM	#5
olds350 Needs a long road trip... 347 Rep 527 Posts Drives: '11 e91, '13 e88, '19 golf R Join Date: Jul 2015 Location: NC iTrader: (0)	The Bosch coils on these cars are notorious for going bad. Buy a set of Delphi's and be done with it. I had to replace all of mine at 37k miles. Had one going bad and once I got into the job I saw where someone had already replaced another coil. Been running fine so far, but it only has ~1500 miles since the swap.
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01-13-2019, 09:30 PM	#6
QuebecDIY Private 54 Rep 59 Posts Drives: 135i 2008 Coupe Join Date: Oct 2018 Location: Montreal iTrader: (0)	What I personally do in such a case... Swap coil 3 and 4 Erase codes Run the engine If you still have miss fire, check which cylinder. If miss fire on cyl 4, defective coil pack If still cylinder 3, check to push it a bit more, else might be your spark plug. Also, pay attention... I read somewhere that if you have oil or other liquid it might creates miss fire with those coil packs.
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