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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 > N55 Rough Idle W/ catless dp after JB4 ISO?



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      04-29-2013, 03:42 PM   #45
divisionbell77
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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
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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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      05-02-2013, 03:03 AM   #47
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Quote:
Originally Posted by graham999au View Post
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.
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      05-02-2013, 03:04 AM   #48
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Quote:
Originally Posted by divisionbell77 View Post
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!
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      05-07-2013, 05:42 PM   #49
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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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      05-07-2013, 05:50 PM   #50
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Originally Posted by TZANIDO777 View Post
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?
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      05-09-2013, 01:26 PM   #51
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Quote:
Originally Posted by TZANIDO777 View Post
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.
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      05-10-2013, 01:00 PM   #52
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im about to go Catted DP on my N55. JB4 stage 2. did anyone ever resolve this>
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      05-10-2013, 08:49 PM   #53
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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.
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      05-12-2013, 02:55 PM   #54
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My catless VRSF is coming this week. We'll see how it goes..
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      05-14-2013, 10:34 AM   #55
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same issue with dp and g5iso
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      05-23-2013, 10:34 AM   #56
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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
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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
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      06-04-2014, 10:20 AM   #58
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Quote:
Originally Posted by SRT14PimPin07 View Post
I did this....It made no difference for my car.
Did you ever find a cure?

Having similar issues, looking for the magic fix!
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      06-04-2014, 08:59 PM   #59
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I'm non-ISO/cat less and running fine. Haven't made the switch yet.
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      06-04-2014, 09:22 PM   #60
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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
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      06-04-2014, 11:10 PM   #61
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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
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      06-04-2014, 11:12 PM   #62
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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
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      06-05-2014, 08:12 AM   #63
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Quote:
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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.
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      06-05-2014, 08:55 AM   #64
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Quote:
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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
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      06-05-2014, 09:49 AM   #65
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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.
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      06-05-2014, 08:22 PM   #66
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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?
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