N55 Rough Idle W/ catless dp after JB4 ISO?

SRT14PimPin07 · 02-04-2013, 08:54 PM

Quote:

Originally Posted by mashimarho

That is definitely unnatural, but this is only since ISO update?

Well about a month after ISO update it started to do it.

SRT14PimPin07 · 02-04-2013, 08:55 PM

Quote:

Originally Posted by paradoxical3

Check your o2 sensors. Trust me....

That's found on my downpipe right?

SRT14PimPin07 · 02-04-2013, 09:38 PM

I decided to try removing the JB4 completely, and see if the problem continues. If the problem stops then I can confirm the JB4 was causing it.

Mike@N54Tuning.com · 02-04-2013, 09:50 PM

Quote:

Originally Posted by SRT14PimPin07

I decided to try removing the JB4 completely, and see if the problem continues. If the problem stops then I can confirm the JB4 was causing it.

So, bypassing the MAF connector didn't help the car at all?

Mike

jzingerman · 04-05-2013, 08:42 PM

Ever fix the problem?

SRT14PimPin07 · 04-06-2013, 01:31 PM

Quote:

Originally Posted by jzingerman

Ever fix the problem?

Nope, tried putting my stock air box back in and that didn't help either. Only other engine mods are JB4, CP, DP.

gatorheel · 04-06-2013, 02:32 PM

I have g5, dci and catless dp. I have noticed some non-linear changes in idle since utilizing the g5iso. The idle seems to be more step-like but it is very hard to notice. Can't recall if I had the same issues w the non-g5. Idle is like 500rpm and steplike around 500-550-600.

jzingerman · 04-06-2013, 07:22 PM

Quote:

Originally Posted by SRT14PimPin07

Nope, tried putting my stock air box back in and that didn't help either. Only other engine mods are JB4, CP, DP.

Hmm... I'm having the same problem and I have the same mods. Check your codes and see if anything comes up for the o2sensors. I got the code 2D0D which is for the o2 sensors. I'm pretty sure they are screwed up so check yours too.

Also, are you having trouble with getting boost in your car? I thought I was having a chargepipe leak when I wasn't boosting so I got a new charge pipe but the problem is still there. I took my car to BMW and had my tech look over it and he said I had a turbo fault. Maybe the ISO screws with the turbos?

SRT14PimPin07 · 04-06-2013, 09:13 PM

Quote:

Originally Posted by jzingerman

Hmm... I'm having the same problem and I have the same mods. Check your codes and see if anything comes up for the o2sensors. I got the code 2D0D which is for the o2 sensors. I'm pretty sure they are screwed up so check yours too.

Also, are you having trouble with getting boost in your car? I thought I was having a chargepipe leak when I wasn't boosting so I got a new charge pipe but the problem is still there. I took my car to BMW and had my tech look over it and he said I had a turbo fault. Maybe the ISO screws with the turbos?

So what are you doing about that now? I have never gotten a code 2D0D.

jzingerman · 04-07-2013, 04:43 PM

Im going to be buying new o2 sensors and installing them. Hopefully this fixing the problem

Quote:

Originally Posted by SRT14PimPin07

So what are you doing about that now? I have never gotten a code 2D0D.

SRT14PimPin07 · 04-08-2013, 08:27 PM

Quote:

Originally Posted by jzingerman

Im going to be buying new o2 sensors and installing them. Hopefully this fixing the problem

Let me know what happens. I thought that could be the problem for my car. But considering the amount of miles I have and when I put the DP on ppl said my O2 sensors can't have gone bad this early.

emackin · 04-08-2013, 08:57 PM

im getting the same issues and i believe its the iso ill try disconnecting the maf sensor from the jb4 see if that helps.

SRT14PimPin07 · 04-08-2013, 10:12 PM

Quote:

Originally Posted by emackin

im getting the same issues and i believe its the iso ill try disconnecting the maf sensor from the jb4 see if that helps.

If your talking about the one that connects to the air intake. I did that and it did not help.

Josh5442 · 04-10-2013, 02:08 PM

I have the same issue, except I'm stock. BMW can't seem to explain it.

eyim1988 · 04-10-2013, 02:22 PM

this is common, happened to me a lot before with a downpipe. But once i changed to my single 3 all the way from downpipe back never had a problem.

SRT14PimPin07 · 04-10-2013, 08:42 PM

Quote:

Originally Posted by Josh5442

I have the same issue, except I'm stock. BMW can't seem to explain it.

Now that's a real problem! Keep us updated if anything changes.

Josh5442 · 04-24-2013, 11:32 PM

Quote:

Originally Posted by SRT14PimPin07

Now that's a real problem! Keep us updated if anything changes.

So far they've done a software update and replaced 2 Vanos units apparently. I'll update when I hear more tomorrow.

jmkworld · 04-25-2013, 01:56 AM

i just went through this same exact thing. jb4 iso with bms catless dp. tach would jump and really harsh idle. put the car back to stock and took it in for warranty. dealer replaced the fuel sensor and the o2 sensors (even though the catless dp was still installed

) Problem seems to be fixed. Have not had a chance to put the jb4 back on yet.

SRT14PimPin07 · 04-25-2013, 05:40 PM

Quote:

Originally Posted by jmkworld

i just went through this same exact thing. jb4 iso with bms catless dp. tach would jump and really harsh idle. put the car back to stock and took it in for warranty. dealer replaced the fuel sensor and the o2 sensors (even though the catless dp was still installed

) Problem seems to be fixed. Have not had a chance to put the jb4 back on yet.

Aww man, now you got me worried. I think I should do the same.

graham999au · 04-29-2013, 12:36 AM

I believe the problems you are experiencing have been fixed in SIB 120912 (see attached).

Hope this helps.

TZANIDO777 · 04-29-2013, 12:29 PM

For what its worth, I have had my jb4 with the iso update and catless downpipe for a few months and I was experiencing the same problems with rough idle and the car stalling.

I had to take the jb4 off the car and remove the catless downpipe in order to pass my inspection here in New York and I also got my service done a few days later.

During the two weeks that I had the car completely stock, other than an intercooler and chargepipe, I experienced no rough idle and the car did not die on me once. I reinstalled the jb4 and catless downpipe this past saturday and have since been experiencing rough idle and the car has died on me twice already while driving. I have had no codes thrown and my service advisor told me everything was okay with the car before I reinstalled the jb4 and downpipe.

I am not blaming or bashing BMS for their tune or Berk for their downpipe, I am only sharing my experiences. I also would like this issue to be resolved.

335Dude · 04-29-2013, 02:51 PM

anyone having a similar issue with a n54?

02-04-2013, 09:38 PM	#25
SRT14PimPin07 Captain 32 Rep 995 Posts Drives: BMW 335i Coupe Join Date: Jun 2009 Location: Los Angeles iTrader: (2)	I decided to try removing the JB4 completely, and see if the problem continues. If the problem stops then I can confirm the JB4 was causing it. __________________ 2011 Alpine White E92 335i M-Sport N55 Engine
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04-05-2013, 08:42 PM	#27
jzingerman Second Lieutenant 12 Rep 248 Posts Drives: 2011 Bmw 335i M sport Join Date: Nov 2011 Location: Beverly Hills California iTrader: (1)	Ever fix the problem? __________________ 2011 BMW 335i M Sport- Space Grey Metallic * Black Kidney Grills * Jb4 Stage 2 ISO * Injen Intake * AR 4" Downpipe * 19" VMR V710 * Michelin Pilot Super Sports 235/265 * KW V3 Coilovers * 8k Alpine Angel Eyes * Gloss Black Roof Vinyl
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04-06-2013, 02:32 PM	#29
gatorheel Second Lieutenant 4 Rep 238 Posts Drives: 2007 e90 n54 Join Date: Sep 2011 Location: usa iTrader: (3)	I have g5, dci and catless dp. I have noticed some non-linear changes in idle since utilizing the g5iso. The idle seems to be more step-like but it is very hard to notice. Can't recall if I had the same issues w the non-g5. Idle is like 500rpm and steplike around 500-550-600. __________________ 2009 n54 e90 / Sport Pkg (ZSP) / Premium Pkg (ZPP) / black sapphire metallic / Logic7 / AMS FMIC / BMS 3" DP / BMS OCC / Alpina TCU Flash / ER CP + ForgeDV / Cobb
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04-08-2013, 08:57 PM	#34
emackin First Lieutenant 5 Rep 360 Posts Drives: 2011 M3 e92 Join Date: Jan 2013 Location: Va beach Va iTrader: (5)	im getting the same issues and i believe its the iso ill try disconnecting the maf sensor from the jb4 see if that helps.
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04-10-2013, 02:08 PM	#36
Josh5442 Enlisted Member 6 Rep 36 Posts Drives: 16 RAM RAM Join Date: Jan 2012 Location: Boston iTrader: (0)	I have the same issue, except I'm stock. BMW can't seem to explain it.
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04-10-2013, 02:22 PM	#37
eyim1988 Lieutenant Colonel 30 Rep 1,602 Posts Drives: 2013 335i M Sport Join Date: Feb 2011 Location: Los Angeles, CA iTrader: (5)	this is common, happened to me a lot before with a downpipe. But once i changed to my single 3 all the way from downpipe back never had a problem. __________________ Current: 2011 Honda Accord. Past: 2013 335i 6mt msport JB4, ER Downpipe, ATM FMIC, aFe Momentum PRO 5R Intake, Pure Stage 2 Past: 2011 335i coupe 369 whp/444 torque
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04-25-2013, 01:56 AM	#40
jmkworld Captain 19 Rep 625 Posts Drives: 2011 335i xdrive Join Date: Sep 2010 Location: Philly iTrader: (3)	i just went through this same exact thing. jb4 iso with bms catless dp. tach would jump and really harsh idle. put the car back to stock and took it in for warranty. dealer replaced the fuel sensor and the o2 sensors (even though the catless dp was still installed ) Problem seems to be fixed. Have not had a chance to put the jb4 back on yet.
	Appreciate 0 Quote

04-29-2013, 12:29 PM	#43
TZANIDO777 First Lieutenant 7 Rep 301 Posts Drives: 2011 E82 135i, 2015 F15 X5 35D Join Date: Dec 2010 Location: NY iTrader: (2) Garage List 2015 BMW F15 X5 [0.00] 2011 BMW 135i [0.00]	For what its worth, I have had my jb4 with the iso update and catless downpipe for a few months and I was experiencing the same problems with rough idle and the car stalling. I had to take the jb4 off the car and remove the catless downpipe in order to pass my inspection here in New York and I also got my service done a few days later. During the two weeks that I had the car completely stock, other than an intercooler and chargepipe, I experienced no rough idle and the car did not die on me once. I reinstalled the jb4 and catless downpipe this past saturday and have since been experiencing rough idle and the car has died on me twice already while driving. I have had no codes thrown and my service advisor told me everything was okay with the car before I reinstalled the jb4 and downpipe. I am not blaming or bashing BMS for their tune or Berk for their downpipe, I am only sharing my experiences. I also would like this issue to be resolved.
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04-29-2013, 02:51 PM	#44
335Dude Captain 22 Rep 641 Posts Drives: 2011 335i Coupe Join Date: Feb 2009 Location: Potomac, MD iTrader: (17)	anyone having a similar issue with a n54? __________________ 2011 E92 335i - (6MT \| M-Sport \| 19" Style 230 \| Cobb V2 \| BMS Intake \| VRSF CP \| VRSF DP \| 5" ETS FMIC) 2007 E92 335i, 2008 Corvette, 1999 323i, 2001 Boxster, 1999 Carrera, 1997 Corvette, 2001 Camaro SS
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