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Old 10-27-2010, 08:27 PM   #1
sol_searchin
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E46 misfire cyl 2?

When I first start the car ONLY on cold start I can tell there is a misfire but only for about 5-10 sec after that it's VERY smooth and nice. Well today I finally got a engine light so I checked it and it's a misfire on cyl 2, pulled plug's and they look decent, could this be a ignition coil? How would I check these? anyone else had this problem?
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Old 10-27-2010, 09:35 PM   #2
Trekz
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try swapping the coil to a different cylinder, if after that you get misfire on the cylinder where you swapped the coil too, you know its the coil.
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Old 10-27-2010, 09:39 PM   #3
sol_searchin
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Ya that's what I did, I know there's a way to check output of a coil with a ohm meter just not 100% on that so I did a swap.
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Old 10-27-2010, 09:46 PM   #4
Blackedout95
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Ive had this in combo with stalling after first start up. No clue yet what it is after tackiling 5-6 different possibilities. But ya after cold start there is a definite " mis " or shake that goes away quickly.

be curious what causes it too.
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Old 10-27-2010, 09:53 PM   #5
Trekz
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Quote:
Originally Posted by sol_searchin View Post
Ya that's what I did, I know there's a way to check output of a coil with a ohm meter just not 100% on that so I did a swap.
Im not 100% sure about e46 but i know on e36's you cant fully check a coil with a multimeter. If i recall correctly you can only check the primary coil and not the secondary or the other way around.
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Old 10-27-2010, 10:21 PM   #6
sol_searchin
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Small stuff would be a clogged fuel injector or injector/ plug's or coil, if it's constantly misfiring or causing stall's i would do a compression test sometime's a bent valve causes this also, In my case it's def nothing major and im 99% sure it's a coil just unsure how to test them or the spec's of BMW coil's.


Quote:
Originally Posted by Blackedout95 View Post
Ive had this in combo with stalling after first start up. No clue yet what it is after tackiling 5-6 different possibilities. But ya after cold start there is a definite " mis " or shake that goes away quickly.

be curious what causes it too.
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Old 10-28-2010, 08:22 PM   #7
Trekz
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Here are the specs for e46 coils.
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Old 10-28-2010, 11:12 PM   #8
sol_searchin
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Is there a BMW procedure to follow or just remove the coil and poke at the terminal's lol You can tell I rarely have issue's with my BMW never a need to repair anything lol
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Old 11-01-2010, 11:26 PM   #9
sol_searchin
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Just to update, I replaced the plug's - no change, now replacing the ignition coil so hopefully that's it! if not then injector lol
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Old 11-08-2010, 05:24 PM   #10
Ahctuning
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If it's just a one off occurence, why bother hunting for what's wrong? It has corrected itself
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Old 11-14-2010, 10:08 AM   #11
RockerGuy
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**warning do not try this if you have no idea how much voltage runs thru the coils**

Another method is to pull the coil out and put an old spark plug in it. Tell friend to start engine and check for spark.

I generally leave a sprk plug in the engine hole cuz I dont want any explosive surprise
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Old 11-15-2010, 01:37 PM   #12
B6T
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Someone mentioned injector already... but try pulling the electrical connector of the #2 injector and see if it exhibits the same symptoms. If it does, then you probably need to have your injectors cleaned.
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