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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Possible JB4 problem?



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      12-09-2012, 04:28 PM   #1
akirk18
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Possible JB4 problem?

First off, I have a 2011 e90 with a JB4 stage 2, vanguard exhaust, icarbon catless dp, charge pipe, and an intake.

Every now and then ill have a problem where soon after i start my car ill pull up to a stop or just anywhere i need to slow down to turn and the engine will just shut off. The car is still on but the engine is off and the car doesn't even realize the engine is off, like it doesn't make any dinging noises and no lights come up on the dash indicating the engine is off. It reminds me of how the auto off feature is on some cars but my car just doesn't turn back on.

It seems to only happen when the engine isn't fully warm yet and when the JB4 is active, not on map 0. No codes are ever thrown so i can't investigate the problem myself.

Does anyone have this problem also? Or have something for me to try?

Thanks
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      12-09-2012, 04:42 PM   #2
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usually all these problems happen after jb4 has been installed lol. try leaving it on map 0 see if it turns off again. if it doesnt turn off on map 0 then something from the jb4 is causing it to fail.
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      12-09-2012, 06:04 PM   #3
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Quote:
Originally Posted by akirk18 View Post
First off, I have a 2011 e90 with a JB4 stage 2, vanguard exhaust, icarbon catless dp, charge pipe, and an intake.

Every now and then ill have a problem where soon after i start my car ill pull up to a stop or just anywhere i need to slow down to turn and the engine will just shut off. The car is still on but the engine is off and the car doesn't even realize the engine is off, like it doesn't make any dinging noises and no lights come up on the dash indicating the engine is off. It reminds me of how the auto off feature is on some cars but my car just doesn't turn back on.

It seems to only happen when the engine isn't fully warm yet and when the JB4 is active, not on map 0. No codes are ever thrown so i can't investigate the problem myself.

Does anyone have this problem also? Or have something for me to try?

Thanks
That happens to me sometimes as well but my car runs fine other than that.
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      12-09-2012, 09:58 PM   #4
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Originally Posted by fasteddie222 View Post
That happens to me sometimes as well but my car runs fine other than that.
Mine runs fine 95% of the time I was just wondering if this was happening to anyone else ant if it was a known problem or not.
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      12-09-2012, 10:00 PM   #5
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Originally Posted by jacksonite View Post
usually all these problems happen after jb4 has been installed lol. try leaving it on map 0 see if it turns off again. if it doesnt turn off on map 0 then something from the jb4 is causing it to fail.
It has never happened to me on map 0 so I am pretty positive it is the JB unit. And I did recently upgrade the software but it didn't fix the problem.
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      12-09-2012, 10:30 PM   #6
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Mine runs fine 95% of the time I was just wondering if this was happening to anyone else ant if it was a known problem or not.
Yeah mine runs perfectly fine all the time it only turns off sometimes but it has never happened on map 0
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      12-10-2012, 12:27 AM   #7
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I also have a really rough idle upon start up. I just thought it was because of the cold start but I dont's have another bmw to compare with. So does anyone else also have rough idles upon start up?
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