Rough idle

F82beamer · 03-21-2020, 06:39 PM

Sometimes when i start my car in the morning it will suddenly rev up on its own. And almost sounds likes gonna die but it doesn't.
Currently have downpipes + tune. New spark plugs? Been meaning to change them anyways.

LINF83 · 03-21-2020, 07:39 PM

93 or e85 ?

F82beamer · 03-21-2020, 07:41 PM

Quote:

Originally Posted by RyF80

93 or e85 ?

Im on 91. I know its normal on e85

jpy1980 · 03-21-2020, 09:09 PM

Hmm no intakes? Maybe take out your MAF sensor and clean them

Kilabyte · 03-21-2020, 09:51 PM

Plugs.

I'm ALWAYS right sometimes

F82beamer · 03-22-2020, 12:08 AM

Quote:

Originally Posted by Kilabyte

Plugs.

I'm ALWAYS right sometimes

That's what i was thinking. I already have some at home i was waiting to install when i go e85 but guess I should just do it now

hellokitty · 03-23-2020, 12:15 AM

Quote:

Originally Posted by M4nacev2

Quote:

Originally Posted by RyF80

93 or e85 ?

Im on 91. I know its normal on e85

Not sure if I would call that normal even on e85... I had long cranks initially on e85 but it was my hpfp that was failing. It went away after I replaced the hpfp.

Keep in mind this was on my N54 and not S55.

JayKno · 03-23-2020, 05:14 PM

Yep, check the plugs.

F82beamer · 03-24-2020, 12:17 PM

Quote:

Originally Posted by JayKno

Yep, check the plugs.

Yes pretty sure thats the issue! Will check this weekend.

03-21-2020, 06:39 PM	#1
F82beamer Banned 14 Rep 72 Posts Drives: 2016 BMW M4 Join Date: Mar 2020 Location: Bay Area iTrader: (1)	Rough idle Sometimes when i start my car in the morning it will suddenly rev up on its own. And almost sounds likes gonna die but it doesn't. Currently have downpipes + tune. New spark plugs? Been meaning to change them anyways.
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03-21-2020, 07:39 PM	#2
LINF83 Lieutenant 852 Rep 445 Posts Drives: F80 Join Date: Feb 2019 Location: Maryalnd-DMV iTrader: (0)	93 or e85 ?
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03-21-2020, 09:09 PM	#4
jpy1980 Lieutenant Colonel 1582 Rep 1,976 Posts Drives: 2015 BMW M3 -Smurfy Blue Vinyl Join Date: Sep 2018 Location: Los Angeles iTrader: (3)	Hmm no intakes? Maybe take out your MAF sensor and clean them
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03-21-2020, 09:51 PM	#5
Kilabyte I'm Batman! 3948 Rep 1,477 Posts Drives: Mineral White M3 6MT Join Date: Jun 2019 Location: Massachusetts iTrader: (1)	Plugs. I'm ALWAYS right sometimes __________________ S55, 2JZ, M48.00
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03-23-2020, 05:14 PM	#8
JayKno Private First Class 33 Rep 135 Posts Drives: 2015 BMW M4 Join Date: Apr 2016 Location: Baton Rouge, LA iTrader: (2) Garage List 2015 BMW M4 [0.00]	Yep, check the plugs.
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