MHD Stage 2+// Spark plugs

Nknight · 05-22-2020, 10:45 AM

Hi there guys, so I have been on MHD Stage 2+ 91oct for a little over a month now. About 2 months ago I had just replaced all of my Spark Plugs and Coils with brand new OEM parts. Recently tho I have noticed on cold start my car is not sitting as high up in the RPMS as before and kinda bounces around while coming down, and then at idle I have noticed I am sitting about 250rpm lower than I used to. These symptoms only appeared the past couple of days. Should I be looking to upgrade to Step 2 colder plugs and upgraded coils? Maybe something has come loose? I will be checking them out on my lunch today so I will update.

type-dRew · 05-22-2020, 01:00 PM

unless your spark plugs or coils are damaged in some way, no running colder plugs will not fix your cold start or idle issues

and oem n54 are also fine for s2+ tunes anyway

Nknight · 05-22-2020, 01:35 PM

Awesome thats what my gut feeling was just wanted to verify. I will be inspecting them soon to look for any damage.

Bimmer_Bro · 05-22-2020, 03:52 PM

I run oem bosch plugs on stage 2+ with no issues. I would guess you problem might be fuel injector related, fuel pump, or in need of a carbon clean?
Try and run some logs to see whats going on.

_N54 · 05-23-2020, 03:31 PM

Pull your plugs out after the car sits overnight and see if any are wet or fouled you might have leaking injector(s)

05-22-2020, 10:45 AM	#1
Nknight Enlisted Member 13 Rep 40 Posts Drives: 2011 335is E92 Join Date: Oct 2019 Location: Socal iTrader: (0)	MHD Stage 2+// Spark plugs Hi there guys, so I have been on MHD Stage 2+ 91oct for a little over a month now. About 2 months ago I had just replaced all of my Spark Plugs and Coils with brand new OEM parts. Recently tho I have noticed on cold start my car is not sitting as high up in the RPMS as before and kinda bounces around while coming down, and then at idle I have noticed I am sitting about 250rpm lower than I used to. These symptoms only appeared the past couple of days. Should I be looking to upgrade to Step 2 colder plugs and upgraded coils? Maybe something has come loose? I will be checking them out on my lunch today so I will update. __________________ 2011 335is 6MT // MHD Stage 2+ 91Oct, CSF 7.5' intercooler, BMS chargepipe, Tial BOV, VRSF downpipes, H&R Street Performance Coilovers, Apex ARC-8 18x9.5 ET35 square, Bridgestone re71r 275x35x18
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05-22-2020, 01:00 PM	#2
type-dRew Major 642 Rep 1,245 Posts Drives: 2009 335i xDrive Join Date: Feb 2019 Location: Newport MI iTrader: (0)	unless your spark plugs or coils are damaged in some way, no running colder plugs will not fix your cold start or idle issues and oem n54 are also fine for s2+ tunes anyway __________________ 2009 335i xDrive AT / 177k+ miles PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50 11.61 @ 117.5 New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets
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05-22-2020, 01:35 PM	#3
Nknight Enlisted Member 13 Rep 40 Posts Drives: 2011 335is E92 Join Date: Oct 2019 Location: Socal iTrader: (0)	Awesome thats what my gut feeling was just wanted to verify. I will be inspecting them soon to look for any damage. __________________ 2011 335is 6MT // MHD Stage 2+ 91Oct, CSF 7.5' intercooler, BMS chargepipe, Tial BOV, VRSF downpipes, H&R Street Performance Coilovers, Apex ARC-8 18x9.5 ET35 square, Bridgestone re71r 275x35x18
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05-22-2020, 03:52 PM	#4
Bimmer_Bro Captain 394 Rep 972 Posts Drives: 2010 BMW 335xi LCI Join Date: Dec 2019 Location: Calgary Alberta Canada iTrader: (0)	I run oem bosch plugs on stage 2+ with no issues. I would guess you problem might be fuel injector related, fuel pump, or in need of a carbon clean? Try and run some logs to see whats going on. __________________ Instagram : @Bimmer_bro Last edited by Bimmer_Bro; 05-22-2020 at 03:52 PM.. Reason: spelling
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05-23-2020, 03:31 PM	#5
_N54 Captain 302 Rep 884 Posts Drives: 335d Join Date: Mar 2020 Location: USA iTrader: (0)	Pull your plugs out after the car sits overnight and see if any are wet or fouled you might have leaking injector(s) __________________ 2013 335is - sold 2011 335d
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