One ignition coil per month? - BMW 3-Series (E90 E92) Forum

Saintor · 11-03-2012, 06:50 PM

2 in 2 months; #2 last month #4 this month. 2007 N52N 70000miles. Should I expect to change the remaining 4?

P2 · 11-04-2012, 09:03 AM

Quote:

Originally Posted by Saintor

2 in 2 months; #2 last month #4 this month. 2007 N52N 70000miles. Should I expect to change the remaining 4?

I lost one in March or so and then changed the rest myself following the spark plug DIY. It's was just too much of a hassle when one goes out that I figured it was worth it. I bought the parts here: http://www.autohausaz.com/

Socom · 11-04-2012, 11:25 AM

I would. In the past it was considered good preventive maintenance to do all of them once 1-2 went bad.

Saintor · 11-05-2012, 05:19 PM

I just wonder if there could be something "above" that could mess the coils. The coincidence is incredible.

Ricke90 · 11-06-2012, 09:08 PM

The coincidence really isn't all that incredible. I you think about it for a minute, you'll realize that they all have fired nearly the exact same amount of times. If they are all made nearly the same they will all fail at the same time.

I'm surprised someone didn't tell you to replace them all at once. That being said, replace the rest if you don't want to deal with more misfires.

Eric335 · 11-06-2012, 11:29 PM

Quote:

Originally Posted by Ricke90

The coincidence really isn't all that incredible. I you think about it for a minute, you'll realize that they all have fired nearly the exact same amount of times. If they are all made nearly the same they will all fail at the same time.

I'm surprised someone didn't tell you to replace them all at once. That being said, replace the rest if you don't want to deal with more misfires.

Replace the other 4 at the same time, so that if you keep the car for another 30k miles, you will know that they all are about the same age. Thats what i would do once they all start misfiring. I will be doing this eventually.

Doc K · 11-06-2012, 11:38 PM

Aren't these like $50 each? I took my to the dealership because I didn't have time to order parts, and I think that's how much they charged me.

Saintor · 11-07-2012, 06:10 PM

Quote:

Originally Posted by Eric335

Replace the other 4 at the same time, so that if you keep the car for another 30k miles, you will know that they all are about the same age. Thats what i would do once they all start misfiring. I will be doing this eventually.

This should happen way beyond only 70000 miles, IMO...

Saintor · 11-17-2012, 05:47 PM

For the record, the #4 misfire was not the ignition coil. It was the spark plug! So much for the 100000 miles interval...

Ricke90 · 11-18-2012, 06:50 PM

Are you not replacing the plugs at the same time as the coils?

Saintor · 11-18-2012, 07:04 PM

Quote:

Originally Posted by Ricke90

Are you not replacing the plugs at the same time as the coils?

I will change the 5 others in the next weeks as I have them. I don't see the point to change the coils - it should not be on a preventive schedule unless the design is weak. Bosch doesn't impress me. I have a spare in case.

11-03-2012, 06:50 PM	#1
Saintor Colonel Drives: E90 Join Date: Sep 2005 Location: MTL, Canada Posts: 2,241 iTrader: (1)	One ignition coil per month? 2 in 2 months; #2 last month #4 this month. 2007 N52N 70000miles. Should I expect to change the remaining 4? __________________ 2007 E90 AW 323i Step \| Lowered 1.25"/1" \| BMW Performance Exhaust \| PBX \| Debadged \| Scangauge II \| Style 162 18" & 161 17" wheels & rear 15mm spacers Last edited by Saintor; 11-03-2012 at 09:21 PM.
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11-17-2012, 05:47 PM	#9
Saintor Colonel Drives: E90 Join Date: Sep 2005 Location: MTL, Canada Posts: 2,241 iTrader: (1)	For the record, the #4 misfire was not the ignition coil. It was the spark plug! So much for the 100000 miles interval... __________________ 2007 E90 AW 323i Step \| Lowered 1.25"/1" \| BMW Performance Exhaust \| PBX \| Debadged \| Scangauge II \| Style 162 18" & 161 17" wheels & rear 15mm spacers

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11-04-2012, 11:25 AM	#3
Socom Brigadier General Drives: 2010 335D Join Date: May 2005 Location: USA Posts: 4,772 iTrader: (0)	I would. In the past it was considered good preventive maintenance to do all of them once 1-2 went bad.

11-05-2012, 05:19 PM	#4
Saintor Colonel Drives: E90 Join Date: Sep 2005 Location: MTL, Canada Posts: 2,241 iTrader: (1)	I just wonder if there could be something "above" that could mess the coils. The coincidence is incredible. __________________ 2007 E90 AW 323i Step \| Lowered 1.25"/1" \| BMW Performance Exhaust \| PBX \| Debadged \| Scangauge II \| Style 162 18" & 161 17" wheels & rear 15mm spacers

11-06-2012, 09:08 PM	#5
Ricke90 New Member Drives: 330i Join Date: Oct 2012 Location: Lotsa places Posts: 16 iTrader: (0)	The coincidence really isn't all that incredible. I you think about it for a minute, you'll realize that they all have fired nearly the exact same amount of times. If they are all made nearly the same they will all fail at the same time. I'm surprised someone didn't tell you to replace them all at once. That being said, replace the rest if you don't want to deal with more misfires.

11-06-2012, 11:38 PM	#7
Doc K Fleet Admiral ★★★★★ Drives: E90 325i SG Join Date: Feb 2011 Location: Woodinville Posts: 499 iTrader: (2)	Aren't these like $50 each? I took my to the dealership because I didn't have time to order parts, and I think that's how much they charged me.

11-18-2012, 06:50 PM	#10
Ricke90 New Member Drives: 330i Join Date: Oct 2012 Location: Lotsa places Posts: 16 iTrader: (0)	Are you not replacing the plugs at the same time as the coils?