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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Jb4 problem



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      06-19-2013, 11:56 PM   #1
SGJB135i
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Jb4 problem

Hey guys, I keep installing my jb4 and a few weeks later I keep getting a check engine light and it's a misfire cylinder. My car has 90k miles right now. I believe my dealer changed my cylinders but I maybe wrong. But is it the jb4 messing up or it's just my jb4? I never had a problem when my car was stock but with the jb4 its giving me a problem. Please someone let me know ASAP, thank you.
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      06-20-2013, 12:09 AM   #2
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http://www.e90post.com/forums/showthread.php?t=631829

When's the last time you changed the spark plugs? Where in Cali are you located?
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      06-20-2013, 12:26 AM   #3
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They changed your cylinders??

If you can read the codes and post them here, we can give you more detailed help.
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      06-20-2013, 01:43 AM   #4
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Quote:
Originally Posted by E90Company
They changed your cylinders??

If you can read the codes and post them here, we can give you more detailed help.
P305 cylinder 5!
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      06-20-2013, 01:44 AM   #5
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Quote:
Originally Posted by Marz11
http://www.e90post.com/forums/showthread.php?t=631829

When's the last time you changed the spark plugs? Where in Cali are you located?
30k miles. I will change those soon
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      06-20-2013, 08:59 AM   #6
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Plugs and/or ignition coil.
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      06-20-2013, 10:06 AM   #7
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Quote:
Originally Posted by _ink
Plugs and/or ignition coil.
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      06-20-2013, 04:25 PM   #8
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Quote:
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30k miles. I will change those soon
So you have 60K miles on the plugs? If that's right you should definitely change those as a first step.
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      06-20-2013, 08:43 PM   #9
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check your coils!!!! make sure they are not damaged.
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      06-24-2013, 09:40 PM   #10
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Sorry guys i forgot the dealer changed my spark plugs 2000 miles ago. This happens to my car often and I take off the jb4 and it is good to go with no problems. Anyone else have expeirnce with this?
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      06-24-2013, 09:44 PM   #11
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Try replacing the coil first (cylinder 5) and see if that does the trick. If not it could be injectors starting to go (did you get yours replaced by recall?).
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      06-24-2013, 09:45 PM   #12
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Its a tune induced misfire, likely something with your ignition is not up to snuff. If plugs are that new, replace the coilpack.
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      06-24-2013, 09:47 PM   #13
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Quote:
Originally Posted by litxus View Post
Try replacing the coil first (cylinder 5) and see if that does the trick. If not it could be injectors starting to go (did you get yours replaced by recall?).

yes it went through the recall. I doubt it would be the injectors.
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      06-24-2013, 09:47 PM   #14
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Quote:
Originally Posted by 135Pats View Post
Its a tune induced misfire, likely something with your ignition is not up to snuff. If plugs are that new, replace the coilpack.
Im just going to try to switch around the coils. It is off my car right now, but i will put it back on soon. Thank you.
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