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      08-09-2015, 11:36 AM   #1
olenilsen
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335i Coil replacement

My 2009 335i keeps getting misfire codes P0302 during hard accelleration, strong vibration after this occurs. An engine restart usually removes the vibration. According to other posts to this forum a coil replacement is needed. Looking for a recommendation for what coils to buy, there are so many types. My local BMW mechanic (not a dealer) quoted me $530 for 6 coils.
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      08-09-2015, 11:40 AM   #2
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That's a good price if it includes install.
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      08-09-2015, 01:01 PM   #3
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Quote:
Originally Posted by olenilsen View Post
My 2009 335i keeps getting misfire codes P0302 during hard accelleration, strong vibration after this occurs. An engine restart usually removes the vibration. According to other posts to this forum a coil replacement is needed. Looking for a recommendation for what coils to buy, there are so many types. My local BMW mechanic (not a dealer) quoted me $530 for 6 coils.
You can DIY it yourself for $175.00

Bosch 0044

http://www.amazon.com/gp/aw/d/B00BJP89US/ref=mp_s_a_1_2?qid=1439139556&sr=8-2&pi=AC_SY200_QL40&keywords=bosch+00044&dpPl=1&dpI D=51FzI4buxvL&ref=plSrch

The N54 requires plugs to be changed every 45K. If your close, you might as well change them too. All the miss firing does put extra strain on your spark plugs.
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      08-09-2015, 01:13 PM   #4
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Quote:
Originally Posted by mweisdorfer
Quote:
Originally Posted by olenilsen View Post
My 2009 335i keeps getting misfire codes P0302 during hard accelleration, strong vibration after this occurs. An engine restart usually removes the vibration. According to other posts to this forum a coil replacement is needed. Looking for a recommendation for what coils to buy, there are so many types. My local BMW mechanic (not a dealer) quoted me $530 for 6 coils.
You can DIY it yourself for $175.00

Bosch 0044

http://www.amazon.com/gp/aw/d/B00BJP89US/ref=mp_s_a_1_2?qid=1439139556&sr=8-2&pi=AC_SY200_QL40&keywords=bosch+00044&dpPl=1&dpI D=51FzI4buxvL&ref=plSrch

The N54 requires plugs to be changed every 45K. If your close, you might as well change them too. All the miss firing does put extra strain on your spark plugs.
that's what I did $ 247 I paid for parts did it myself done easy gorgeous a misfire after due to 1 coil not sitting all the way in fix that done
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      08-09-2015, 04:23 PM   #5
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Quote:
Originally Posted by alexg212 View Post
That's a good price if it includes install.
That's an awful price. You can get all 6 for under $200 shipped from a few sources. It would take longer to drive to a shop to have them done than to just DIY. It's literally a 30 minute task.

Unless you think $350 for 30 minutes of work is a good deal.
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      08-09-2015, 08:35 PM   #6
olenilsen
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Amazon states in not compatible

Do I need to worry that Amazon states this does not fit my BMW 335i 2009 N54?


Quote:
Originally Posted by mweisdorfer View Post
You can DIY it yourself for $175.00

Bosch 0044

http://www.amazon.com/gp/aw/d/B00BJP...xvL&ref=plSrch

The N54 requires plugs to be changed every 45K. If your close, you might as well change them too. All the miss firing does put extra strain on your spark plugs.
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      08-09-2015, 08:45 PM   #7
AnthonyT
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Quote:
Originally Posted by olenilsen View Post
Do I need to worry that Amazon states this does not fit my BMW 335i 2009 N54?
Yes it will fit, are you going to do this yourself?
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      08-09-2015, 09:32 PM   #8
Game
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Quote:
Originally Posted by nekbreaker View Post
that's what I did $ 247 I paid for parts did it myself done easy gorgeous a misfire after due to 1 coil not sitting all the way in fix that done
What a marvelous sentence.
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      08-09-2015, 10:08 PM   #9
alexg212
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Quote:
Originally Posted by Nitrousbird View Post
That's an awful price. You can get all 6 for under $200 shipped from a few sources. It would take longer to drive to a shop to have them done than to just DIY. It's literally a 30 minute task.

Unless you think $350 for 30 minutes of work is a good deal.
Misread, thought it said $330. Lol
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      08-10-2015, 11:31 PM   #10
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Quote:
Originally Posted by Game
Quote:
Originally Posted by nekbreaker View Post
that's what I did $ 247 I paid for parts did it myself done easy gorgeous a misfire after due to 1 coil not sitting all the way in fix that done
What a marvelous sentence.
Lol sorry auto correct didt
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      08-11-2015, 09:38 AM   #11
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Quote:
Originally Posted by alexg212 View Post
That's a good price if it includes install.
NO
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      08-11-2015, 04:22 PM   #12
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Quote:
Originally Posted by olenilsen View Post
My 2009 335i keeps getting misfire codes P0302 during hard accelleration, strong vibration after this occurs. An engine restart usually removes the vibration. According to other posts to this forum a coil replacement is needed. Looking for a recommendation for what coils to buy, there are so many types. My local BMW mechanic (not a dealer) quoted me $530 for 6 coils.
Are you sure it's a bad coil? The simple test is to move the bad coil from the cyl of the misfire over two cyl's (swap those coil locations) and see if the error code follows the coil. If the error follows the coil... then its a bad coil and you should just change out all 6 since the other 5 are close behind.

The best way to order new coils is to order two coils at a time from AAP and use a $30 off $75 coupon code (do that for 3 orders and you should have 6). The other way to do it is order all six from RockAuto.Com

IF the error does not follow the coil... you might just need new spark plugs. You can get those Bosch plugs for about $13/each and you usually need to change those every 25k miles if Tuned and every 45k miles if stock.

If you change the spark plugs and the problem doesn't follow the coil... then the last thing it could be is needing Carbon/Walnut blasting. This usually is indicated with a car that has higher mileage (60k+) and usually starts with a cyl 5 or cyl 6 misfire (Look to spend about $250 in the forums section to get someone to carbon blast it and install a new gasket). You should also use this opportunity to replace your stock Charge Pipe with an after market charge pipe since the parts are already off (no additional labor needed). Same with getting the BMS OCC installed. You may also want to consider having your Oil Filter Housing Gasket (OFHG) looked at for pools of oil as an indicator to replace the gasket (since a good amount of the labor for tear down is done... you can just do a little more labor and change out that $10 gasket). I would advise to get an oil change done as well if you do the OFHG.
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      08-12-2015, 03:55 AM   #13
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just diy...if you dont know what your doing..it'll take you hr max. once your experienced i would say like 15-20min. I would swap out all your spark plugs first and try to trouble shoot down to which coil by swapping like others have suggested.

You can buy oem bosch coils and spark plugs on amazon for cheap. I would start there.
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      08-12-2015, 03:56 AM   #14
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here's cobb vid to help you get started.

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      08-12-2015, 02:18 PM   #15
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I got Delphi N55 coils for my N54 from RockAuto, came out to about $200 shipped.

If you're quick, you can install them in under 20 minutes.
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      08-12-2015, 03:25 PM   #16
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Quote:
Originally Posted by ferocity02 View Post
I got Delphi N55 coils for my N54 from RockAuto, came out to about $200 shipped.

If you're quick, you can install them in under 20 minutes.
When I had my stock n54 coils replaced under CPO they gave me six Delphi n55 coils as well. I haven't had any issues yet and it's been about 10k miles on them.
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      08-12-2015, 04:10 PM   #17
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Quote:
Originally Posted by ferocity02 View Post
I got Delphi N55 coils for my N54 from RockAuto, came out to about $200 shipped.

If you're quick, you can install them in under 20 minutes.
Agreed...taking the cowl off is the most time consuming part.
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      08-13-2015, 01:38 PM   #18
olenilsen
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Quote:
Originally Posted by AnthonyT View Post
Yes it will fit, are you going to do this yourself?
yes, following
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      08-13-2015, 01:42 PM   #19
olenilsen
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Yes, I did move the coils and the misfire followed the coil I moved, I am also replacing all spark plugs since I am in there anyway

Quote:
Originally Posted by fazman View Post
Are you sure it's a bad coil? The simple test is to move the bad coil from the cyl of the misfire over two cyl's (swap those coil locations) and see if the error code follows the coil. If the error follows the coil... then its a bad coil and you should just change out all 6 since the other 5 are close behind.

The best way to order new coils is to order two coils at a time from AAP and use a $30 off $75 coupon code (do that for 3 orders and you should have 6). The other way to do it is order all six from RockAuto.Com

IF the error does not follow the coil... you might just need new spark plugs. You can get those Bosch plugs for about $13/each and you usually need to change those every 25k miles if Tuned and every 45k miles if stock.

If you change the spark plugs and the problem doesn't follow the coil... then the last thing it could be is needing Carbon/Walnut blasting. This usually is indicated with a car that has higher mileage (60k+) and usually starts with a cyl 5 or cyl 6 misfire (Look to spend about $250 in the forums section to get someone to carbon blast it and install a new gasket). You should also use this opportunity to replace your stock Charge Pipe with an after market charge pipe since the parts are already off (no additional labor needed). Same with getting the BMS OCC installed. You may also want to consider having your Oil Filter Housing Gasket (OFHG) looked at for pools of oil as an indicator to replace the gasket (since a good amount of the labor for tear down is done... you can just do a little more labor and change out that $10 gasket). I would advise to get an oil change done as well if you do the OFHG.
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      08-14-2015, 04:39 PM   #20
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Quote:
Originally Posted by olenilsen View Post
Yes, I did move the coils and the misfire followed the coil I moved, I am also replacing all spark plugs since I am in there anyway
Sounds like a good plan!
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      08-14-2015, 06:51 PM   #21
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Try this.

http://www.am-autoparts.com/BMW/335i...40/804698.html

It's not BMW or Bosch branded, but they work. When my car started misfiring, I changed plugs and used these coils and it's been great since. I know a few guys running these and they've had no issues either. Plus it comes with a 10 year warranty if they fail, only cost to you is shipping. I think the warranty itself ms worth it. They shipped super fast too as I was short on time.
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