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      11-05-2017, 09:37 PM   #1
Monteblueem5
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Jb4 install problems

Soi got my car a month ago with 52k car runs fine
So I decided to add more power so I put a jb4
With bcm put it all in set on map 1 went for a run
I noticed the pulled harder but it stated to break up
Up top on the hyw check engine came on pulled
It up I got misfires codes so I put it in map 4
And it’s fine in map 4
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      11-05-2017, 10:34 PM   #2
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Gap your plugs and put better gas
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      11-05-2017, 11:41 PM   #3
Monteblueem5
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The plugs where never changed that could be it
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      11-10-2017, 01:47 PM   #4
steeve13m
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Oem gap is 0.032 change to 0.02
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      11-19-2017, 08:17 AM   #5
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Hi, I just have a 1er, but lurking and doing research as I’m hoping to get a 2014+ M5 after the 1 is paid off in 3 years.

Anyway, get 1 step colder plugs and gap to whatever is recommended for the JB4. Its either at .02 or .022, I forget.
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      11-19-2017, 06:40 PM   #6
TrevorM3
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Quote:
Originally Posted by Monteblueem5 View Post
Soi got my car a month ago with 52k car runs fine
So I decided to add more power so I put a jb4
With bcm put it all in set on map 1 went for a run
I noticed the pulled harder but it stated to break up
Up top on the hyw check engine came on pulled
It up I got misfires codes so I put it in map 4
And it’s fine in map 4



sounds like jb4
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      11-20-2017, 09:54 AM   #7
M5Rlz
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Honestly no real reason to buy a JB4 with tuning capabilities now.


As an early adopter here thats all we had but now, I'd just go right to a legit tune. Going to cover more perimeters and likely be better if you get a recommendation for competent shop here.
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      11-20-2017, 10:38 AM   #8
steeve13m
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Quote:
Originally Posted by TrevorM3 View Post
sounds like jb4
JB4 has been bulletproof for me great system
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      11-20-2017, 12:37 PM   #9
M5_Brandoe
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When was the last time your plugs were changed ? if they have not been changed, change them. Gap appropriately or buy a colder plug NGK.

I would have the car scanned to see exactly, could be a coil as well.

I just recently threw a misfire, changed my plugs and all coils (a little over kill) but my car is running awesome.
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      11-20-2017, 04:38 PM   #10
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Quote:
Originally Posted by M5_Brandoe View Post
When was the last time your plugs were changed ? if they have not been changed, change them. Gap appropriately or buy a colder plug NGK.

I would have the car scanned to see exactly, could be a coil as well.

I just recently threw a misfire, changed my plugs and all coils (a little over kill) but my car is running awesome.
Which tune are you using?
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      11-22-2017, 02:56 PM   #11
steeve13m
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I had the same issue.....jb4 stresses the coils and plugs....so I replaced all coils and plugs plus gapped to the 0.02 and car never check engined again.....but obviously have your mechanic check the codes generated to confirm
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