2010 128i misfire cylinder 3

turbosl2 · 05-27-2015, 05:22 PM

My 1er has 47000 miles on it and thew a Check engine light. The Mil lamp then went out after the next start. I still checked the stored code anyway. I have the iNPA software on my laptop and it indicates the following cylinder 3 misfire. So I bought a new coil and replaced it today and it still seems to misfire and stumble for a split second. No MiL light but as I mentioned a few sentences above the Mil light went out and it still missed a few times.

turbosl2 · 05-27-2015, 08:20 PM

Any ideas

turbosl2 · 05-28-2015, 05:37 AM

Plugs this early?

Billup · 05-28-2015, 08:03 AM

I probably would have replaced all the coils and plugs together.

My plugs were pretty foul at 53k miles, so I did both plugs and coils. Had a misfire, car would bog really bad if I tried to accelerate too quickly. After everything was replaced, runs like a dream again.

Did you check the plug before you stuck the new coil on?

MightyMouseTech · 05-28-2015, 08:11 AM

If the coil went bad, I would at least replace all the plugs at the same time. If it was my car I would just replace all the coils and plugs.

EMWOLB · 05-28-2015, 10:58 AM

Replacing the plugs is a good idea, but the coils are over kill and expensive. With the coils, you can do a simple check pulling them off one-by-one checking for any change in the sound of the engine. No change, the coil is dead. If this isn't possible, there are other simple tests:

MightyMouseTech · 05-28-2015, 11:11 AM

We used to do that here at work, replacing only the one bad coil. Customers got tired of replacing one coil and plug, drive for a month, replace another coil and plug, drive for a couple months, replace one bad coil and plug and $7000 worth of cat converters due to driving with a misfire and replace all the remaining plugs and coils.

Now we just replace all coils and plugs when one goes bad. Done.

05-27-2015, 05:22 PM	#1
turbosl2 Private First Class 19 Rep 132 Posts Drives: 1 series Join Date: Dec 2011 Location: USA iTrader: (0)	2010 128i misfire cylinder 3 My 1er has 47000 miles on it and thew a Check engine light. The Mil lamp then went out after the next start. I still checked the stored code anyway. I have the iNPA software on my laptop and it indicates the following cylinder 3 misfire. So I bought a new coil and replaced it today and it still seems to misfire and stumble for a split second. No MiL light but as I mentioned a few sentences above the Mil light went out and it still missed a few times. Attached Images
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05-27-2015, 08:20 PM	#2
turbosl2 Private First Class 19 Rep 132 Posts Drives: 1 series Join Date: Dec 2011 Location: USA iTrader: (0)	Any ideas
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05-28-2015, 05:37 AM	#3
turbosl2 Private First Class 19 Rep 132 Posts Drives: 1 series Join Date: Dec 2011 Location: USA iTrader: (0)	Plugs this early?
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05-28-2015, 08:03 AM	#4
Billup Banned 472 Rep 928 Posts Drives: Your mum crazy. Join Date: Jun 2013 Location: Baconopolos Island iTrader: (0)	I probably would have replaced all the coils and plugs together. My plugs were pretty foul at 53k miles, so I did both plugs and coils. Had a misfire, car would bog really bad if I tried to accelerate too quickly. After everything was replaced, runs like a dream again. Did you check the plug before you stuck the new coil on?
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05-28-2015, 08:11 AM	#5
MightyMouseTech Major General 4338 Rep 6,196 Posts Drives: 13 135i 6MT LeMans Blue MSport Join Date: Feb 2013 Location: Ottawa, Canada iTrader: (0)	If the coil went bad, I would at least replace all the plugs at the same time. If it was my car I would just replace all the coils and plugs.
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05-28-2015, 10:58 AM	#6
EMWOLB Bon Vivant 2 Rep 41 Posts Drives: 2015 M235i Join Date: Apr 2015 Location: Cleveland, Ohio iTrader: (0)	Replacing the plugs is a good idea, but the coils are over kill and expensive. With the coils, you can do a simple check pulling them off one-by-one checking for any change in the sound of the engine. No change, the coil is dead. If this isn't possible, there are other simple tests:
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05-28-2015, 11:11 AM	#7
MightyMouseTech Major General 4338 Rep 6,196 Posts Drives: 13 135i 6MT LeMans Blue MSport Join Date: Feb 2013 Location: Ottawa, Canada iTrader: (0)	We used to do that here at work, replacing only the one bad coil. Customers got tired of replacing one coil and plug, drive for a month, replace another coil and plug, drive for a couple months, replace one bad coil and plug and $7000 worth of cat converters due to driving with a misfire and replace all the remaining plugs and coils. Now we just replace all coils and plugs when one goes bad. Done.
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