N55 Rough Idle W/ catless dp after JB4 ISO?

divisionbell77 · 04-29-2013, 03:42 PM

to make sure this is clear to all, this is only after the ISO update with a catless DP?

Before, with the 'regular' JB4 and catless DP, it has worked fine?

jmkworld · 04-30-2013, 09:43 AM

When I experienced my rough idle which eventually leading to the car jerking at a stop sign and stalling out, I had jb4 iso, catless dp, bms intake, and chargepipe. took off the jb4 and gave it to the dealer. they replaced a fuel pressure sensor and my oxygen sensors on dp. I did not experience this before ISO.

SRT14PimPin07 · 05-02-2013, 03:03 AM

Quote:

Originally Posted by graham999au

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

Hope this helps.

Ohh wow this is amazing! I'm gonna print it and take it to my SA.

SRT14PimPin07 · 05-02-2013, 03:04 AM

Quote:

Originally Posted by divisionbell77

to make sure this is clear to all, this is only after the ISO update with a catless DP?

Before, with the 'regular' JB4 and catless DP, it has worked fine?

In my case....I'm a YES. Prior to the ISO update everything was perfectly fine!

TZANIDO777 · 05-07-2013, 05:42 PM

If anyone is still having a problem with this, I suggest you try what Mike suggested...My car stalled on me 4 times and idle was all over the place this morning. I went home and tried what Mike suggested about switching the MAF sensor back to stock and my idle went completely back to normal, no rough idle, no stalling, after driving about 50 miles.

jzingerman · 05-07-2013, 05:50 PM

Quote:

Originally Posted by TZANIDO777

If anyone is still having a problem with this, I suggest you try what Mike suggested...My car stalled on me 4 times and idle was all over the place this morning. I went home and tried what Mike suggested about switching the MAF sensor back to stock and my idle went completely back to normal, no rough idle, no stalling, after driving about 50 miles.

I was having similar issues and had a bank 1 sensor 1 fault code. I fixed the O2 sensors but the problem only got worse. My car has now been stalling at lights, its always stuttering and also misfires. I'm having multiple misfire codes as well. Has anyone had this issue? I was told it might be the injectors but I'm not sure. Do you guys think putting the MAF sensors back to normal or updating the DME will fix the problem?

SRT14PimPin07 · 05-09-2013, 01:26 PM

Quote:

Originally Posted by TZANIDO777

If anyone is still having a problem with this, I suggest you try what Mike suggested...My car stalled on me 4 times and idle was all over the place this morning. I went home and tried what Mike suggested about switching the MAF sensor back to stock and my idle went completely back to normal, no rough idle, no stalling, after driving about 50 miles.

I did this....It made no difference for my car.

NeoNz · 05-10-2013, 01:00 PM

im about to go Catted DP on my N55. JB4 stage 2. did anyone ever resolve this>

SRT14PimPin07 · 05-10-2013, 08:49 PM

Quote:

Originally Posted by NeoNz

im about to go Catted DP on my N55. JB4 stage 2. did anyone ever resolve this>

Do catless or don't do it at all....Catted DP's aren't worth the money vs. power.

bdoooh · 05-12-2013, 02:55 PM

My catless VRSF is coming this week. We'll see how it goes..

myfly335 · 05-14-2013, 10:34 AM

same issue with dp and g5iso

bdoooh · 05-23-2013, 10:34 AM

Just got my dp installed this last weekend. I seem to be the total opposite. My idle was bad when I switched to ISO and it would stall sometimes at lights until the car was warmed up.. My idle seems much better now that I installed the dp and switched to map2.... Wtf? I mean, I'm not complaining..

hetzle · 05-23-2013, 12:42 PM

Soooo I'm running JB4 ISO right now without a DP, but my 4" AA one is coming in on Saturday. I don't know of anyone else on here running the AA DP + JB4 ISO so we'll see what happens

Jsoboti · 06-04-2014, 10:20 AM

Quote:

Originally Posted by SRT14PimPin07

I did this....It made no difference for my car.

Did you ever find a cure?

Having similar issues, looking for the magic fix!

Gearhead327 · 06-04-2014, 08:59 PM

I'm non-ISO/cat less and running fine. Haven't made the switch yet.

Jsoboti · 06-04-2014, 09:22 PM

Quote:

Originally Posted by Gearhead327

I'm non-ISO/cat less and running fine. Haven't made the switch yet.

Maybe hold off on switching to ISO. I'm going to try and go back to non ISO

Knobi · 06-04-2014, 11:10 PM

Quote:

Originally Posted by Jsoboti

Quote:

Originally Posted by Gearhead327

I'm non-ISO/cat less and running fine. Haven't made the switch yet.

Maybe hold off on switching to ISO. I'm going to try and go back to non ISO

Do you have the Flex Fuel wires? Interested to get your feedback if you go back to non-iso

Jsoboti · 06-04-2014, 11:12 PM

Don't have flex fuel,
Also don't know how to go back to non ISO but I may have to try it, stalling at every traffic light sucks

Sidewinderpb · 06-05-2014, 08:12 AM

Quote:

Originally Posted by Jsoboti

Don't have flex fuel,
Also don't know how to go back to non ISO but I may have to try it, stalling at every traffic light sucks

Yeah mine stalls here and there. Most of the time, it's when the engine reached temp and the JB4 turns on.

Jsoboti · 06-05-2014, 08:55 AM

Quote:

Originally Posted by paradoxical3

Check your o2 sensors. Trust me....

What about the 02 sensors could cause this? What's the fix? Car is stalling at almost every traffic light

Gearhead327 · 06-05-2014, 09:49 AM

Looks like I'm going to stick with Non-ISO. I'm running FF wires with a 60/40 mix on Map 5 and everything is great. I'm going with "if it aint broke don't fix it" for now.

Jsoboti · 06-05-2014, 08:22 PM

Quote:

Originally Posted by Gearhead327

Looks like I'm going to stick with Non-ISO. I'm running FF wires with a 60/40 mix on Map 5 and everything is great. I'm going with "if it aint broke don't fix it" for now.

I put my G5 board back to non-iso and it actually runs way worse. stalls absolutely every time i am stopped for more than 30 seconds. Whats your setup? what kind of DP? are you using mini cats or are your 02 sensors plugged straight in to the DP?

04-29-2013, 03:42 PM	#45
divisionbell77 Lieutenant 16 Rep 459 Posts Drives: 2011 335i XDrive Coupe Join Date: Mar 2012 Location: Ohio iTrader: (1)	to make sure this is clear to all, this is only after the ISO update with a catless DP? Before, with the 'regular' JB4 and catless DP, it has worked fine?
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04-30-2013, 09:43 AM	#46
jmkworld Captain 54 Rep 627 Posts Drives: 2013 x3 Join Date: Sep 2010 Location: Boston iTrader: (3)	When I experienced my rough idle which eventually leading to the car jerking at a stop sign and stalling out, I had jb4 iso, catless dp, bms intake, and chargepipe. took off the jb4 and gave it to the dealer. they replaced a fuel pressure sensor and my oxygen sensors on dp. I did not experience this before ISO.
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05-07-2013, 05:42 PM	#49
TZANIDO777 Lieutenant 73 Rep 527 Posts Drives: 2011 E82 135i, 2015 F15 X5 35D Join Date: Dec 2010 Location: NY iTrader: (2) Garage List 2020 BMW X5 40i [0.00] 2011 BMW 135i [0.00]	If anyone is still having a problem with this, I suggest you try what Mike suggested...My car stalled on me 4 times and idle was all over the place this morning. I went home and tried what Mike suggested about switching the MAF sensor back to stock and my idle went completely back to normal, no rough idle, no stalling, after driving about 50 miles.
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05-10-2013, 01:00 PM	#52
NeoNz 335 Newbie 23 Rep 484 Posts Drives: 2011 335i xDrive Join Date: Mar 2013 Location: Edison, NJ iTrader: (1) Garage List 1994 Toyota Supra [0.00] 2011 BMW 335i xDrive [0.00]	im about to go Catted DP on my N55. JB4 stage 2. did anyone ever resolve this> __________________ 2011 BMW 335i xDrive, 12.2 @ 111 (e90 N55 XDrive Record)- Sold Stage 2, Map 7/e85 mix, JB Intake, Vishnu Catted DP, ETS FMIC, CPe Chargepipe 1994 Toyota Supra, Baltic Blue, 6-speed, mods... FOR SALE 1200rwhp/875rwtq, 3.4L Stroker
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05-12-2013, 02:55 PM	#54
bdoooh Captain 112 Rep 969 Posts Drives: 2014 SSII M5 CP Join Date: Feb 2011 Location: Ohio iTrader: (2)	My catless VRSF is coming this week. We'll see how it goes..
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05-14-2013, 10:34 AM	#55
myfly335 Lieutenant 61 Rep 487 Posts Drives: 2011 e90 sport pkg ALL BLACK Join Date: Jul 2011 Location: Hicksville, New York iTrader: (4) Garage List 2011 BMW 335 [0.00]	same issue with dp and g5iso
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05-23-2013, 10:34 AM	#56
bdoooh Captain 112 Rep 969 Posts Drives: 2014 SSII M5 CP Join Date: Feb 2011 Location: Ohio iTrader: (2)	Just got my dp installed this last weekend. I seem to be the total opposite. My idle was bad when I switched to ISO and it would stall sometimes at lights until the car was warmed up.. My idle seems much better now that I installed the dp and switched to map2.... Wtf? I mean, I'm not complaining..
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05-23-2013, 12:42 PM	#57
hetzle First Lieutenant 32 Rep 373 Posts Drives: E90 335i Join Date: Dec 2011 Location: San Francisco, California iTrader: (0)	Soooo I'm running JB4 ISO right now without a DP, but my 4" AA one is coming in on Saturday. I don't know of anyone else on here running the AA DP + JB4 ISO so we'll see what happens __________________ 2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk Last edited by hetzle; 05-23-2013 at 01:13 PM..
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06-04-2014, 08:59 PM	#59
Gearhead327 Enlisted Member 2 Rep 44 Posts Drives: 2011 335i M-Sport 6MT Join Date: Dec 2013 Location: Poughkeepsie, NY iTrader: (0)	I'm non-ISO/cat less and running fine. Haven't made the switch yet. __________________ 11 335i 6MT M-Sport --- BMS LED//JB4//VAF//ER CP//BMS DP//FF Wires
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06-04-2014, 11:12 PM	#62
Jsoboti Lieutenant 28 Rep 583 Posts Drives: 2011 335i E92 M-Sport 6MT Join Date: May 2014 Location: Mississippi iTrader: (0)	Don't have flex fuel, Also don't know how to go back to non ISO but I may have to try it, stalling at every traffic light sucks __________________ JB4 G5 ISO FF \| BMS Performance Intake \| BMS Wheel Spacers \| VRSF Catless DP \| Red CYBA Scoops \| Supreme Power Lowering Perches \| VRSF Charge Pipe \| VMR 810 19x8.5 ET35 19x9.5 ET33 \| Michelin PSS 235/265 \| BMS CDV \| BMS Clutch Stop \| 4'' Tips
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06-05-2014, 09:49 AM	#65
Gearhead327 Enlisted Member 2 Rep 44 Posts Drives: 2011 335i M-Sport 6MT Join Date: Dec 2013 Location: Poughkeepsie, NY iTrader: (0)	Looks like I'm going to stick with Non-ISO. I'm running FF wires with a 60/40 mix on Map 5 and everything is great. I'm going with "if it aint broke don't fix it" for now. __________________ 11 335i 6MT M-Sport --- BMS LED//JB4//VAF//ER CP//BMS DP//FF Wires
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