F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Idle issue on cold start only
Extreme Powerhouse
Post Reply
 
Thread Tools Search this Thread
      12-02-2019, 10:33 PM   #1
Tpriest7893
Lieutenant
United_States
74
Rep
400
Posts

Drives: Bmw 335i f30 N55
Join Date: Nov 2017
Location: Venice Florida

iTrader: (0)

Idle issue on cold start only

I have 2012 bmw 335i. It has always had that type of idle after a cold start when you turn it on it almost hesitates for a second and then the rpm goes up with the loud cold start sound.

I recently got a new intercooler and charge pipe. Upgraded it all.

When I start the car ONLY on a cold start when the car has sat for a good 5-6+ hours it hesitates and is louder then normal. And then goes too normal. If I drive around and start the car after let's say running errands it's fine. It's something that I'm ok with dealing with because it's only on a cold start but I'm just curious as to why it does that.

Car is on stock spark plugs, no tune. Fully bolted. CP/IC/intake/DP.

Car is driving phenomenal. I don't feel any leaks, open throttle and normal driving it's so much better then it was before I did the upgrade. I know it's not an O ring issue or anything like that. Just strictly cold start.

Any one encounter this?
__________________
-Tods
Appreciate 0
      12-08-2019, 02:38 PM   #2
Jake From State Farm
Uhh... Khakis?
Jake From State Farm's Avatar
United_States
43
Rep
130
Posts

Drives: 335i RWD
Join Date: Jun 2018
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by Tpriest7893 View Post
I have 2012 bmw 335i. It has always had that type of idle after a cold start when you turn it on it almost hesitates for a second and then the rpm goes up with the loud cold start sound.

I recently got a new intercooler and charge pipe. Upgraded it all.

When I start the car ONLY on a cold start when the car has sat for a good 5-6+ hours it hesitates and is louder then normal. And then goes too normal. If I drive around and start the car after let's say running errands it's fine. It's something that I'm ok with dealing with because it's only on a cold start but I'm just curious as to why it does that.

Car is on stock spark plugs, no tune. Fully bolted. CP/IC/intake/DP.

Car is driving phenomenal. I don't feel any leaks, open throttle and normal driving it's so much better then it was before I did the upgrade. I know it's not an O ring issue or anything like that. Just strictly cold start.

Any one encounter this?
Totally normal. The purpose of the cold start is to warm the catalytic converter. You can tune this out if you donít like it with BM3 or MHD.
__________________
335i Sportline RWD | PWG | BSM | Coral Red Interior | CTS Turbo - Intake w/ K&N filter, FMIC & CP | Wagner Catted DP | BM3 e30 Stg2 | PR Coils | 3.5 bar TMAP | Dinan LPFP | ZF8 Sport w/ BM3 flash | Resonator Delete | 5% Tint | ///M-style black kidney grilles | Black Rohana RC10 19x8.5 et 33 / 9.5 et 35
Appreciate 0
      12-08-2019, 02:40 PM   #3
Tpriest7893
Lieutenant
United_States
74
Rep
400
Posts

Drives: Bmw 335i f30 N55
Join Date: Nov 2017
Location: Venice Florida

iTrader: (0)

Quote:
Originally Posted by Jake From State Farm View Post
Quote:
Originally Posted by Tpriest7893 View Post
I have 2012 bmw 335i. It has always had that type of idle after a cold start when you turn it on it almost hesitates for a second and then the rpm goes up with the loud cold start sound.

I recently got a new intercooler and charge pipe. Upgraded it all.

When I start the car ONLY on a cold start when the car has sat for a good 5-6+ hours it hesitates and is louder then normal. And then goes too normal. If I drive around and start the car after let's say running errands it's fine. It's something that I'm ok with dealing with because it's only on a cold start but I'm just curious as to why it does that.

Car is on stock spark plugs, no tune. Fully bolted. CP/IC/intake/DP.

Car is driving phenomenal. I don't feel any leaks, open throttle and normal driving it's so much better then it was before I did the upgrade. I know it's not an O ring issue or anything like that. Just strictly cold start.

Any one encounter this?
Totally normal. The purpose of the cold start is to warm the catalytic converter. You can tune this out if you don't like it with BM3 or MHD.
Yeah I know but the car almost stalling and it didn't do that before I changed the charge pipe and intercooler. I don't have a tune at the moment.
Nonetheless, it hasn't done it since. I'm in Florida and we had a few days of morning 50 degree weather and since those cold days it hasn't done it. Very odd
__________________
-Tods
Appreciate 0
      12-08-2019, 02:42 PM   #4
Jake From State Farm
Uhh... Khakis?
Jake From State Farm's Avatar
United_States
43
Rep
130
Posts

Drives: 335i RWD
Join Date: Jun 2018
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by Tpriest7893 View Post
Yeah I know but the car almost stalling and it didn't do that before I changed the charge pipe and intercooler. I don't have a tune at the moment.
Nonetheless, it hasn't done it since. I'm in Florida and we had a few days of morning 50 degree weather and since those cold days it hasn't done it. Very odd
Usually rough idle problems are coil related. When was the last time you changed them out?
__________________
335i Sportline RWD | PWG | BSM | Coral Red Interior | CTS Turbo - Intake w/ K&N filter, FMIC & CP | Wagner Catted DP | BM3 e30 Stg2 | PR Coils | 3.5 bar TMAP | Dinan LPFP | ZF8 Sport w/ BM3 flash | Resonator Delete | 5% Tint | ///M-style black kidney grilles | Black Rohana RC10 19x8.5 et 33 / 9.5 et 35
Appreciate 0
      12-08-2019, 02:44 PM   #5
Tpriest7893
Lieutenant
United_States
74
Rep
400
Posts

Drives: Bmw 335i f30 N55
Join Date: Nov 2017
Location: Venice Florida

iTrader: (0)

Quote:
Originally Posted by Jake From State Farm View Post
Quote:
Originally Posted by Tpriest7893 View Post
Yeah I know but the car almost stalling and it didn't do that before I changed the charge pipe and intercooler. I don't have a tune at the moment.
Nonetheless, it hasn't done it since. I'm in Florida and we had a few days of morning 50 degree weather and since those cold days it hasn't done it. Very odd
Usually rough idle problems are coil related. When was the last time you changed them out?
Haven't. One coil failed around 50k miles replaced under warranty.
Spark plus are stock which I plan to change once I tune but lately the start has been good and normal. It was just off during those cold days
__________________
-Tods
Appreciate 0
      12-08-2019, 02:47 PM   #6
Jake From State Farm
Uhh... Khakis?
Jake From State Farm's Avatar
United_States
43
Rep
130
Posts

Drives: 335i RWD
Join Date: Jun 2018
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by Tpriest7893 View Post
Haven't. One coil failed around 50k miles replaced under warranty.
Spark plus are stock which I plan to change once I tune but lately the start has been good and normal. It was just off during those cold days
Glad to hear itís better now. If it begins doing it again swapping them out would probably help, especially if theyíre stock and your MY2012. I have the same year and had to swap them out as soon a I tuned it.
__________________
335i Sportline RWD | PWG | BSM | Coral Red Interior | CTS Turbo - Intake w/ K&N filter, FMIC & CP | Wagner Catted DP | BM3 e30 Stg2 | PR Coils | 3.5 bar TMAP | Dinan LPFP | ZF8 Sport w/ BM3 flash | Resonator Delete | 5% Tint | ///M-style black kidney grilles | Black Rohana RC10 19x8.5 et 33 / 9.5 et 35
Appreciate 1
      12-08-2019, 02:48 PM   #7
thejeremyman9
First Lieutenant
119
Rep
386
Posts

Drives: 2015 BMW 335i
Join Date: May 2019
Location: USA

iTrader: (0)

Quote:
Originally Posted by Tpriest7893 View Post
Haven't. One coil failed around 50k miles replaced under warranty.
Spark plus are stock which I plan to change once I tune but lately the start has been good and normal. It was just off during those cold days
What intake do you have? Usually cold start and rough idle are attributed to intake.
Appreciate 0
      12-08-2019, 02:48 PM   #8
Tpriest7893
Lieutenant
United_States
74
Rep
400
Posts

Drives: Bmw 335i f30 N55
Join Date: Nov 2017
Location: Venice Florida

iTrader: (0)

Quote:
Originally Posted by Jake From State Farm View Post
Quote:
Originally Posted by Tpriest7893 View Post
Haven't. One coil failed around 50k miles replaced under warranty.
Spark plus are stock which I plan to change once I tune but lately the start has been good and normal. It was just off during those cold days
Glad to hear it's better now. If it begins doing it again swapping them out would probably help, especially if they're stock and your MY2012. I have the same year and had to swap them out as soon a I tuned it.
Yeah I figured I would tune soon, and see how it runs and if it sucks I'll swap them. Did you go with stocks or the smaller gap?
__________________
-Tods
Appreciate 0
      12-08-2019, 02:50 PM   #9
Tpriest7893
Lieutenant
United_States
74
Rep
400
Posts

Drives: Bmw 335i f30 N55
Join Date: Nov 2017
Location: Venice Florida

iTrader: (0)

Quote:
Originally Posted by thejeremyman9 View Post
Quote:
Originally Posted by Tpriest7893 View Post
Haven't. One coil failed around 50k miles replaced under warranty.
Spark plus are stock which I plan to change once I tune but lately the start has been good and normal. It was just off during those cold days
What intake do you have? Usually cold start and rough idle are attributed to intake.
Injen but the issue started after I did the charge pipe and intercooler but now that my car hasn't done it I notice it was only on a few very cold days. It's been the normal cold start now. We had a few cold 50 degree days( I'm in Florida) but since then it's been fine. Had the intake for about year and a half and hasn't gave me any issues
__________________
-Tods
Appreciate 0
      12-08-2019, 02:54 PM   #10
Jake From State Farm
Uhh... Khakis?
Jake From State Farm's Avatar
United_States
43
Rep
130
Posts

Drives: 335i RWD
Join Date: Jun 2018
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by Tpriest7893 View Post
Yeah I figured I would tune soon, and see how it runs and if it sucks I'll swap them. Did you go with stocks or the smaller gap?
I tried NGK 97506 and several gap sizes (.20, .22, .24, etc.) and had issues with all. My car did not like those plugs and would studder/misfire at high speed under load. It drove me crazy trying to figure out what was going on. Finally I ordered stock Bosch plugs (stock gap) paired with PR coils and it runs perfect.

I know many have luck with the 97506 so i guess it may just depend on the car.
__________________
335i Sportline RWD | PWG | BSM | Coral Red Interior | CTS Turbo - Intake w/ K&N filter, FMIC & CP | Wagner Catted DP | BM3 e30 Stg2 | PR Coils | 3.5 bar TMAP | Dinan LPFP | ZF8 Sport w/ BM3 flash | Resonator Delete | 5% Tint | ///M-style black kidney grilles | Black Rohana RC10 19x8.5 et 33 / 9.5 et 35
Appreciate 0
      12-08-2019, 02:56 PM   #11
Tpriest7893
Lieutenant
United_States
74
Rep
400
Posts

Drives: Bmw 335i f30 N55
Join Date: Nov 2017
Location: Venice Florida

iTrader: (0)

Quote:
Originally Posted by Jake From State Farm View Post
Quote:
Originally Posted by Tpriest7893 View Post
Yeah I figured I would tune soon, and see how it runs and if it sucks I'll swap them. Did you go with stocks or the smaller gap?
I tried NGK 97506 and several gap sizes (.20, .22, .24, etc.) and had issues with all. My car did not like those plugs and would studder/misfire at high speed under load. It drove me crazy trying to figure out what was going on. Finally I ordered stock Bosch plugs (stock gap) paired with PR coils and it runs perfect.

I know many have luck with the 97506 so i guess it may just depend on the car.
That's good info, i spoke to Bryan from kiesmotorsports and he used stocks until he went pure stage 2. So I will more then likely stick with stock and if it gives me issues mess around
__________________
-Tods
Appreciate 1
      12-08-2019, 02:57 PM   #12
Jake From State Farm
Uhh... Khakis?
Jake From State Farm's Avatar
United_States
43
Rep
130
Posts

Drives: 335i RWD
Join Date: Jun 2018
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by Tpriest7893 View Post
That's good info, i spoke to Bryan from kiesmotorsports and he used stocks until he went pure stage 2. So I will more then likely stick with stock and if it gives me issues mess around
Thatís a good call
__________________
335i Sportline RWD | PWG | BSM | Coral Red Interior | CTS Turbo - Intake w/ K&N filter, FMIC & CP | Wagner Catted DP | BM3 e30 Stg2 | PR Coils | 3.5 bar TMAP | Dinan LPFP | ZF8 Sport w/ BM3 flash | Resonator Delete | 5% Tint | ///M-style black kidney grilles | Black Rohana RC10 19x8.5 et 33 / 9.5 et 35
Appreciate 0
      12-08-2019, 02:58 PM   #13
Tpriest7893
Lieutenant
United_States
74
Rep
400
Posts

Drives: Bmw 335i f30 N55
Join Date: Nov 2017
Location: Venice Florida

iTrader: (0)

Quote:
Originally Posted by Jake From State Farm View Post
Quote:
Originally Posted by Tpriest7893 View Post
That's good info, i spoke to Bryan from kiesmotorsports and he used stocks until he went pure stage 2. So I will more then likely stick with stock and if it gives me issues mess around
That's a good call
Which tune did you go with?
__________________
-Tods
Appreciate 0
      12-08-2019, 03:03 PM   #14
Jake From State Farm
Uhh... Khakis?
Jake From State Farm's Avatar
United_States
43
Rep
130
Posts

Drives: 335i RWD
Join Date: Jun 2018
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by Tpriest7893 View Post
Which tune did you go with?
I went BM3 and opted for the WiFi agent. It is very user friendly and their customer service is awesome. Iíve heard good things about MHD as well and have a few buddies running it. I donít think you can go wrong with either except MHD runs off of android only and doesnít offer an apple option.
__________________
335i Sportline RWD | PWG | BSM | Coral Red Interior | CTS Turbo - Intake w/ K&N filter, FMIC & CP | Wagner Catted DP | BM3 e30 Stg2 | PR Coils | 3.5 bar TMAP | Dinan LPFP | ZF8 Sport w/ BM3 flash | Resonator Delete | 5% Tint | ///M-style black kidney grilles | Black Rohana RC10 19x8.5 et 33 / 9.5 et 35
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 05:41 AM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST