Rough idle

black-n54 · 10-22-2018, 05:04 PM

Hello guys

First some informations about my car:
Bmw m6 f12 year 2013
I got a new engine 1 year ago from BMW on warranty.

Now I have a problem:
My idle is rough!! I hear also some little misfires from the exhaust.
What I‘ve tried:
- change spark plugs
- change ignition coils
- change injectors
- change airmass meter

Still the rough idle! I didnt have warranty on the engine anymore.

And the best thing: no error codes!

I also have tried a bmw update and reset all adaptions, no change.

I hope someone have a idea what I can try.

Thanks guys

allmotor_2000 · 10-22-2018, 10:02 PM

Probably throttle body plates have deteriorated - happens with the flimsy plastic plates.

Craze · 10-23-2018, 05:27 AM

How bad is the idle? One of my dme valvatronix output failed
New dme on the way

black-n54 · 10-23-2018, 07:12 AM

Quote:

Originally Posted by Craze

How bad is the idle? One of my dme valvatronix output failed
New dme on the way

Maybe 80-100 rpms it goes up and down not more

black-n54 · 10-25-2018, 02:22 AM

yesterday I change my lambdas (all 4 of them) and also a new lpfp.
I also check the throttle bodys but no Changes!!

does anybody have a idea what I can check?

wheelpro · 10-25-2018, 06:40 PM

Quote:

Originally Posted by black-n54

yesterday I change my lambdas (all 4 of them) and also a new lpfp.
I also check the throttle bodys but no Changes!!

does anybody have a idea what I can check?

Check Intake valves cooking
And Check if solenoid. vanos need to clean
, check please smooth running for 8 cylinders and let me know please

allmotor_2000 · 10-25-2018, 07:08 PM

Quote:

Originally Posted by black-n54

yesterday I change my lambdas (all 4 of them) and also a new lpfp.
I also check the throttle bodys but no Changes!!

does anybody have a idea what I can check?

Did you do an idle adaptation?

black-n54 · 10-26-2018, 03:07 AM

Quote:

Originally Posted by allmotor_2000

Did you do an idle adaptation?

Yes software Things I‘ve tryed maybe all the options with ISTA.

Today I will check if we found somewhere a leak.

allmotor_2000 · 10-26-2018, 11:58 AM

Quote:

Originally Posted by black-n54

Yes software Things I‘ve tryed maybe all the options with ISTA.

Today I will check if we found somewhere a leak.

A leak can do it as well, although very few places for leaks in the s63tu intake system (post TB, that is...).

steeve13m · 10-26-2018, 12:30 PM

I also have an idle issue but not when car is stopped....usually on the highway after pressing gas hard ..then when I reduce the gas pedal the idle starts to go slightly up and down non stop while cruising....any ideas? maf cleaned, new plugs....my guess is the throttle plates since I have meth? not a big issue since its minor and doesnt always happen

allmotor_2000 · 10-26-2018, 12:42 PM

Quote:

Originally Posted by steeve13m

I also have an idle issue but not when car is stopped....usually on the highway after pressing gas hard ..then when I reduce the gas pedal the idle starts to go slightly up and down non stop while cruising....any ideas? maf cleaned, new plugs....my guess is the throttle plates since I have meth? not a big issue since its minor and doesnt always happen

Possibly - those plastic plates don't hold up well!

kong24680 · 10-26-2018, 12:46 PM

Do you have catless downpipes? Maybe new o2 sensors?

schnell1982 · 10-26-2018, 09:12 PM

BMW extended warranty on the HPFP
It will create idle issues and poor performance
Are you able to monitor some actual values ?
You are using an ISTA ?
That's the best tool to monitor multiple values and run tests

black-n54 · 10-27-2018, 04:36 AM

Quote:

Originally Posted by schnell1982

BMW extended warranty on the HPFP
It will create idle issues and poor performance
Are you able to monitor some actual values ?
You are using an ISTA ?
That's the best tool to monitor multiple values and run tests

Yes i have ista, do you know how i can monitor these Parts?

3rdCoastBMW · 10-30-2018, 12:18 PM

I am having the same issue with a rough idle. Do you guys clean your MAFs or replace them?

Data_Dump · 10-31-2018, 04:54 AM

Quote:

Originally Posted by 3rdCoastBMW

I am having the same issue with a rough idle. Do you guys clean your MAFs or replace them?

I cleaned mine and it completely solved the issue. Takes a few minutes and costs one can of MAF cleaner.

3rdCoastBMW · 11-06-2018, 03:30 PM

Quote:

Originally Posted by Data_Dump

I cleaned mine and it completely solved the issue. Takes a few minutes and costs one can of MAF cleaner.

Thanks, will try that this weekend.

ammo1980 · 08-02-2020, 10:40 AM

Quote:

Originally Posted by 3rdCoastBMW

Thanks, will try that this weekend.

Any follow up?

SpeedProtocol · 08-04-2020, 10:21 AM

is the 2 year cliff hanger getting to you?

M6Roar · 08-12-2020, 11:23 PM

Quote:

Originally Posted by black-n54

Hello guys

First some informations about my car:
Bmw m6 f12 year 2013
I got a new engine 1 year ago from BMW on warranty.

Now I have a problem:
My idle is rough!! I hear also some little misfires from the exhaust.
What I‘ve tried:
- change spark plugs
- change ignition coils
- change injectors
- change airmass meter

Still the rough idle! I didnt have warranty on the engine anymore.

And the best thing: no error codes!

I also have tried a bmw update and reset all adaptions, no change.

I hope someone have a idea what I can try.

Thanks guys

Not sure if this is invaluable info anymore, but I noticed that this happen to me when I switch off the cold start. So what I have done is turn on the cold start and adjust the RPM to 1100 Rev. and the problem solved.

BBHMM · 02-22-2022, 10:00 AM

Quote:

Originally Posted by M6Roar

Not sure if this is invaluable info anymore, but I noticed that this happen to me when I switch off the cold start. So what I have done is turn on the cold start and adjust the RPM to 1100 Rev. and the problem solved.

Hi, is your car have catless dp?
I just notice same problem (st2 catless dp, intakes, tune, COLD START switched off)

M6Roar · 02-23-2022, 05:53 AM

Quote:

Originally Posted by BBHMM

Hi, is your car have catless dp?
I just notice same problem (st2 catless dp, intakes, tune, COLD START switched off)

Yes it does.

10-22-2018, 05:04 PM	#1
black-n54 Enlisted Member 9 Rep 44 Posts Drives: 335i E92 Join Date: Nov 2011 Location: Switzerland iTrader: (1)	Rough idle Hello guys First some informations about my car: Bmw m6 f12 year 2013 I got a new engine 1 year ago from BMW on warranty. Now I have a problem: My idle is rough!! I hear also some little misfires from the exhaust. What I‘ve tried: - change spark plugs - change ignition coils - change injectors - change airmass meter Still the rough idle! I didnt have warranty on the engine anymore. And the best thing: no error codes! I also have tried a bmw update and reset all adaptions, no change. I hope someone have a idea what I can try. Thanks guys
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10-22-2018, 10:02 PM	#2
allmotor_2000 F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph 1087 Rep 1,968 Posts Drives: 2018 RS3, 991 Turbo Join Date: Jul 2014 Location: Westlake Village, CA iTrader: (0)	Probably throttle body plates have deteriorated - happens with the flimsy plastic plates.
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10-23-2018, 05:27 AM	#3
Craze Captain 161 Rep 687 Posts Drives: M5 E60, M5 F10, X5 50i Join Date: Oct 2017 Location: Australia iTrader: (0)	How bad is the idle? One of my dme valvatronix output failed New dme on the way
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10-25-2018, 02:22 AM	#5
black-n54 Enlisted Member 9 Rep 44 Posts Drives: 335i E92 Join Date: Nov 2011 Location: Switzerland iTrader: (1)	yesterday I change my lambdas (all 4 of them) and also a new lpfp. I also check the throttle bodys but no Changes!! does anybody have a idea what I can check?
	Appreciate 0 Quote

10-26-2018, 12:30 PM	#10
steeve13m Second Lieutenant 61 Rep 294 Posts Drives: F10 M5 Join Date: Jun 2016 Location: USA iTrader: (0)	I also have an idle issue but not when car is stopped....usually on the highway after pressing gas hard ..then when I reduce the gas pedal the idle starts to go slightly up and down non stop while cruising....any ideas? maf cleaned, new plugs....my guess is the throttle plates since I have meth? not a big issue since its minor and doesnt always happen __________________ 2019 F90 M5 Competition - Marina bay Blue Pearl - Executive and Bowers & Wilkins package Gone:2013 F10 M5-DCT-Montecarlo Pearl Blue-BBMR 800 Stage 1 system 700whp+(93oct) 2004 Lamborghini Gallardo-Manual-Giallo Midas Pearl Yellow-Modified 2018 Range Rover Velar S-White
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10-26-2018, 12:46 PM	#12
kong24680 Captain 252 Rep 998 Posts Drives: Silverstone Metallic F06 M6 Gr Join Date: Feb 2014 Location: Bay Area iTrader: (5)	Do you have catless downpipes? Maybe new o2 sensors?
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10-26-2018, 09:12 PM	#13
schnell1982 Captain 345 Rep 966 Posts Drives: FAST Join Date: Dec 2015 Location: Southern California iTrader: (0)	BMW extended warranty on the HPFP It will create idle issues and poor performance Are you able to monitor some actual values ? You are using an ISTA ? That's the best tool to monitor multiple values and run tests
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10-30-2018, 12:18 PM	#15
3rdCoastBMW New Member 18 Rep 27 Posts Drives: 2014 F06 M6 Join Date: Jun 2017 Location: Houston iTrader: (0)	I am having the same issue with a rough idle. Do you guys clean your MAFs or replace them?
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08-04-2020, 10:21 AM	#19
SpeedProtocol First Lieutenant 375 Rep 319 Posts Drives: '14 F10 M5 - '21 F90 M5 Join Date: Feb 2020 Location: Fort Worth Texas iTrader: (1)	is the 2 year cliff hanger getting to you?
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