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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 Code Clearing questions....



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      05-25-2012, 11:15 AM   #1
Chris_FL
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JB4 Code Clearing questions....

My 335 has the following...

JB4 (autotune map (5) )
AA Catless DPs
ETS FMIC
Injen Intake
Cp and BOV

I redlined in 3rd the other day, something blew (oil coming out from bottom, car would not run or start after that)

I'm taking everything back to stock over the weekend before it goes to BMW for repair, I have a pricey 3rd party warranty, I don't want to take any chances, Is there any way to use the JB4 to clear any incriminating data of the aftermarket items being in place?
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      05-25-2012, 11:50 AM   #2
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Originally Posted by Chris_FL View Post
My 335 has the following...

JB4 (autotune map (5) )
AA Catless DPs
ETS FMIC
Injen Intake
Cp and BOV

I redlined in 3rd the other day, something blew (oil coming out from bottom, car would not run or start after that)

I'm taking everything back to stock over the weekend before it goes to BMW for repair, I have a pricey 3rd party warranty, I don't want to take any chances, Is there any way to use the JB4 to clear any incriminating data of the aftermarket items being in place?
Just clear all codes from the steering wheel commands. Car just need power, doesn't need to be running.

Mike
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      05-25-2012, 12:19 PM   #3
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Does the Computer hold any info (speed, RPM, etc)?
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      05-25-2012, 12:46 PM   #4
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Does the Computer hold any info (speed, RPM, etc)?
It can record RPM, speed, etc. Did you rev it past redline? Like redlining 3rd and shifting into second instead of 4th?

Mike
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      05-25-2012, 01:48 PM   #5
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No, I shifted into 4th, but the damage was done when I hit the limiter in 3rd, I messed up, was looking in my mirror for a sec.

Is there any way to "unrecord" that info or is it there for good?
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      05-25-2012, 01:54 PM   #6
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the car is supposed to be able to handle a bouncing off the rev-limiter for short periods of time. that's what it's there for. As long as you didn't mechanically over-rev it you should be ok.
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      05-25-2012, 02:14 PM   #7
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Usually you can only force an over rev with a downshift into the wrong gear. That being said it might have blown in 3rd before the shift.
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      05-25-2012, 06:39 PM   #8
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Our car's have rev-limiters, it's a fail-safe so that if you forget to shift in time, you just bounce off the limiter, no harm done. What you're describing sounds like mortal damage to your engine. Are you sure you didn't shift into second by accident? Do you remember if the car died before or after you shifted gears? Also try to think about how hard you shifted, was there a lot of resistance on the way down?

I'm very sorry for your loss. Sounds like you'll need a new engine from what you're describing about oil being everywhere.
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      05-25-2012, 08:52 PM   #9
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Sorry, oil wasn't everywhere, just leaking on the bed of the tow truck. The shop I took it to locally said there was oil coming from the crankshaft bolt, because it appeared loose. They said it appears to be an internal issue, and possibly something with the timing chain, they did no further work on it and said I need to get it to the dealer.

When I shifted into 4th, the gas pedal was useless and lights were flashing (red oil, red trans)
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      05-25-2012, 10:38 PM   #10
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I really hope it's minor for your sake, but it doesn't sound good By internal, I think the shop means you may have thrown a rod.

I'm just confused about how this could have happened unless you money shifted. The JB4 shouldn't mess with the rev limiter unless something malfunctioned. Over rev codes are almost impossible to erase apparently, so you might as well get a BMW diagnostics to figure out what happened.

You won't be able to claim your CPO if they diagnose the over rev. If they do, perhaps you can fully explain the situation, to see if something else was to blame?
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      06-13-2012, 07:08 PM   #11
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Just to update... The Timing chain was snapped, Valves bent, etc. etc.

BMW put a new engine in and I get it back tomorrow... He said he has literally never seen this before. The warranty was 3rd party and covered the claim thankfully.

BMW put a new clutch in (I'm at 58K) while it was all apart for no labor charge at all.
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      06-13-2012, 07:13 PM   #12
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Wow, you got a new engine?! Glad everything went to plan
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      06-13-2012, 07:17 PM   #13
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Yeah, The warranty company provided it, it could be pulled from something wrecked, I'll get more info tomorrow when I pick it up.
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