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      09-06-2013, 07:42 PM   #1
135kev
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Help! Sputtering problem after Dp install

I recently installed "racing" downpipes and n55 midpipes on my n54 135i. I also upgraded my g4 jb4 to the g5 board . On my way home going up a decent hill it started sputtering or misfiring . If I give it a little gas it clears up. But any incline under minor Load it starts sputtering and breaking up. I also installed the nls/ 2step but nls isn't working . Any ideas? Maybe plugs?
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      09-06-2013, 09:46 PM   #2
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Sounds like it is starting to foul plugs, but is burning them off when given more load.
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      09-06-2013, 10:19 PM   #3
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Agreed, sounds like plugs!
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      09-07-2013, 06:50 AM   #4
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I don't think it'll have any codes since I have auto clear on for the downpipes . Any suggestions on good plugs ?
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      09-09-2013, 02:14 PM   #5
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I got 2c31 and 2c32 when I turned off the auto delete but it didn't seem to misfire this time . It only misfires slightly after a 2step going up a hill
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      09-09-2013, 09:26 PM   #6
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I just did valve cleaning and new plugs today and this same thing happened to me afterwards. It has been a problem in the past as well. I reset the jb4 settings. Re installed the firmware with resetting settings again. Took it for a drive after an the same hill and same throttle it didn't happen again. Tried it 4-5 times. Hopefully it stays gone because its been so annoying. Took it to the dealer before the warranty ran out and they couldn't get it to happen again.
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      09-09-2013, 09:38 PM   #7
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Be sure the o2 sensors were not swapped during dp install.

I had this same issue too - turned out being a lpfp sensor.. I could hear the engine begin to sputter, I learned to lighted to load before the fault tripped (after a few times of pulling over & power cycle.

It could be many things.. Fault sensor, plugs, coil pack, fuel supply.. Get Bavarian technic cable and post back
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      09-10-2013, 01:19 AM   #8
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its really wierd, sometimes it wont do it sometimes it will. It seems like its more likley to happen if i 2 step then i proceed to climb a hill then it starts sputtering. I kept scanning for codes and never got any misfire codes besides once. cylinder 3 misfire. but like i said i can feel it "misfiring" up the entire hill and scan it at the top and the only codes were

2C31 Lambda probe in front of catalytic converter, trimming control
2C27 Lambda probe in front of catalytic converter, system check

nothing to do with misfire. Are these normal codes to thro with the downpipes when auto clear isnt on?

and i think i put the sensors back in the right place but i cant say im 100%
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      09-10-2013, 09:59 AM   #9
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Sounds like the sensors were put back in the wrong places or 1 or more are damaged
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      09-10-2013, 10:29 AM   #10
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On top of the motor , is the grey one plugged in up front or in the rear .
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      09-10-2013, 10:51 AM   #11
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Here is a short log of my inclining a hill lightly on the gas and it sputters like crazy , then i give it some gas to clear it up then it starts again . and with it in 6th gear its very violent sometimes. i cant see anything on the LOG im not a pro tho...

Another thing . I Layed into 3rd on the highway it held boost then a sudden drop 3/4 thru the gear down to almost stock boost then a check engine popped.
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Last edited by 135kev; 09-10-2013 at 10:59 AM..
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      09-10-2013, 12:10 PM   #12
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Update : I checked my o2 sensors. The grey is in the Rear turbo plugged in up top in rear, black o2 sensor is in the front turbo plugged in up front on top
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      09-10-2013, 06:56 PM   #13
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Sounds like you installed the o2 wideband sensors in the wrong pipes, probably have to swap them. Did you make sure to note which one came from where?
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      09-10-2013, 06:59 PM   #14
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Quote:
Originally Posted by weebles
Sounds like you installed the o2 wideband sensors in the wrong pipes, probably have to swap them. Did you make sure to note which one came from where?
No we started having a few beers prior and forgot too. But as I stated above , I have the grey in the rear turbo and back up front . Same as the plugs on top. Gray in rear and black up front. Is this correct ? I really hope I installed it wrong so I know wtf is going on !!
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      09-11-2013, 07:18 AM   #15
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same thing keeps happening to me. i get the SES light flashing at me for a few seconds and then it goes away. but it leaves me with stock boost until i turn the car off and back on. every time i try to get a log of it, it stops happening. please god let someone figure out that i did something stupid and fix this. i'll find out if resetting worked this Saturday.
maybe it is the o2's. i thought i marked which one goes where but i could have been wrong.
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      09-12-2013, 07:46 PM   #16
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update: on my way to class it got so bad i barely could drive it.. idle was very rough and at one point i had to restart the car because it seemed as if it was only firing on only 4 cyclinders.. here are my codes

2C31 Lambda probe in front of catalytic converter, trimming control
29CF Misfirings, cylinder 3
29CE Misfirings, cylinder 2
2C7F Lambda probe behind catalytic converter 2, trimm control
2C6A No Description Found
0000 Unknown Fault
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      09-15-2013, 06:48 AM   #17
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Update. Today I decided to try reinstalling the firmware . I had 26.2 or 3 and updated to 26.4 . It ran a lot better for a while. Later on it
Came back slightly . Again only at very minor accel , low load /
Bogging range . It'll sputter and the car would jerk . Waste gate actuator maybe hitting downpipes ? Any ideas. ?

Note: injectors recently replaced. Plugs replaced 4k miles ago
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      09-17-2013, 10:23 PM   #18
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Usually don't drive my car cold but last weekend I was in a hurry and drifted down my hill and by the time I was at the bottom it had warmed up to where the idle dropped. About 45-60 seconds. So I was driving around and there was no sputtering. The car eventually warmed up and the flashers came on to tell me the JB4 had turned on. The same instance the 2 blinkers lit up the car stuttered and from there on out it had the low throttle sputtering. It caught me by surprise because I was going up a slight incline so I was in 4th doing 40 with the throttle just barely depressed to keep me at that speed. Flashers and then shudder. I'm going to try without the jb4 and see what happens. I'll also have to call the dealer and see if there was a recall or anything with the injectors cause that's the only thing I haven't replaced. Really hoped the valve cleaning and spark plugs would fix it.
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      09-17-2013, 10:27 PM   #19
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Quote:
Originally Posted by MuNkY6913
Usually don't drive my car cold but last weekend I was in a hurry and drifted down my hill and by the time I was at the bottom it had warmed up to where the idle dropped. About 45-60 seconds. So I was driving around and there was no sputtering. The car eventually warmed up and the flashers came on to tell me the JB4 had turned on. The same instance the 2 blinkers lit up the car stuttered and from there on out it had the low throttle sputtering. It caught me by surprise because I was going up a slight incline so I was in 4th doing 40 with the throttle just barely depressed to keep me at that speed. Flashers and then shudder. I'm going to try without the jb4 and see what happens. I'll also have to call the dealer and see if there was a recall or anything with the injectors cause that's the only thing I haven't replaced. Really hoped the valve cleaning and spark plugs would fix it.
I had my injectors replaced under warranty . And I believe my car is fixed . I noticed my rear o2 sensors were installed in the wrong place but plugged in correctly . Idk if it was the beer that made me mess that up or the previous owner made the mistake and its been like that forever . I never had problems till a day after the downpipe install . But everything seems a lot more responsive now and clean . I also put techron fuel cleaner in
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      09-19-2013, 10:42 PM   #20
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Quote:
Originally Posted by 135kev
Quote:
Originally Posted by MuNkY6913
Usually don't drive my car cold but last weekend I was in a hurry and drifted down my hill and by the time I was at the bottom it had warmed up to where the idle dropped. About 45-60 seconds. So I was driving around and there was no sputtering. The car eventually warmed up and the flashers came on to tell me the JB4 had turned on. The same instance the 2 blinkers lit up the car stuttered and from there on out it had the low throttle sputtering. It caught me by surprise because I was going up a slight incline so I was in 4th doing 40 with the throttle just barely depressed to keep me at that speed. Flashers and then shudder. I'm going to try without the jb4 and see what happens. I'll also have to call the dealer and see if there was a recall or anything with the injectors cause that's the only thing I haven't replaced. Really hoped the valve cleaning and spark plugs would fix it.
I had my injectors replaced under warranty . And I believe my car is fixed . I noticed my rear o2 sensors were installed in the wrong place but plugged in correctly . Idk if it was the beer that made me mess that up or the previous owner made the mistake and its been like that forever . I never had problems till a day after the downpipe install . But everything seems a lot more responsive now and clean . I also put techron fuel cleaner in
I'm out of warranty but I'm going to see if they'll replace the injectors since it was an issue that I brought to them before my warranty ran out. Specially if there is a service bulletin about them. They've tried to give me the run around a couple times. The service manager is a real nice guy and always ends up helping me out.
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      09-26-2013, 11:04 AM   #21
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What kind of DP's are they?

If the gray sensors are on the short pipe and the black sensors are on the long pipe it's not the o2's unless they were damaged upon install?
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      10-13-2013, 10:31 PM   #22
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Quote:
Originally Posted by MuNkY6913 View Post
I'm out of warranty but I'm going to see if they'll replace the injectors since it was an issue that I brought to them before my warranty ran out. Specially if there is a service bulletin about them. They've tried to give me the run around a couple times. The service manager is a real nice guy and always ends up helping me out.
I have same sputtering problem as everyone else. Supposedly BMW will replace defective injectors regardless of mileage or warranty status. See SI B13 14 10. Three of my injectors were replaced in May 2011. Supposedly the other three were okay. I replaced my plugs at 40K miles. Now I have 53K miles. The other day, I was making it sputter and I got bad misfires and the service engine soon light. I connected my computer and got an error code for misfire on cylinder 6. I left the code for my dealer to see. I bought six new ignition coils and it made an improvement but my problem is still there. I checked my injector part numbers while I was replacing the coils. Injectors for cylinders 2 thru 5 are the new part number, cylinders 1, 2, and 6 have the originals. I have an appt with my dealer in two days to discuss this matter. Hopefully with my knowledge of the SIB, the error code, and all I have replaced, he will be able to replace the other three injectors.

IMO, BMW should not argue with this issue. If an N54 has these injectors and the plugs and coils have been replaced then replace the injectors without question. Heaven help BMW if someone has an accident that can be tied back to these injectors. That'll be as bad as Toyota's gas-pedal debacle.

Last edited by n2djazz; 10-13-2013 at 10:35 PM.. Reason: more clarity
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