multiple cyl misfire only with meth!

marconi118 · 06-16-2015, 04:24 AM

Running a mild 15PSI wedge pumpflash with 9deg timing.

Here in europe premium pump fuel seems to be crap as I have consistent timing drops from 8 to 5 deg starting at 4000rpm

Si I decided to go meth, 50/50 with water. Drops are becoming less when I increase the flow.

But then I have multiple cyl (randomly 1 2 3 5) misfires at 5500rpm. If I increase further the flow the rpm decrease.

I am sure the flow isn't too much, running snow perf N54 dedicated kit.

Is it due to worn plugs?
I am FBO, 80Kmiles, status of plugs unknown, coming from previous owner

Milan · 06-16-2015, 09:34 AM

Could be plugs or it could be from too much water and/or not enough timing. Why did you do a meth kit before plugs? SMH

BQTuning · 06-16-2015, 10:17 AM

What tuning platform are you on, MHD or COBB ?

marconi118 · 06-17-2015, 03:32 AM

simple fash with bb...

logging with JB4

j1gilles · 06-17-2015, 08:31 AM

Check plugs/plug gap

enrita · 06-17-2015, 08:52 AM

which nozzles are u running? might be your trims get so negative that it triggers misfire

marconi118 · 06-18-2015, 03:17 AM

375ml/min nozzle.

Trims are fine

will NJK plugs help?

06-16-2015, 04:24 AM	#1
marconi118 Major 94 Rep 1,184 Posts Drives: 06/07 e93 335i Join Date: Nov 2008 Location: europe iTrader: (0)	multiple cyl misfire only with meth! Running a mild 15PSI wedge pumpflash with 9deg timing. Here in europe premium pump fuel seems to be crap as I have consistent timing drops from 8 to 5 deg starting at 4000rpm Si I decided to go meth, 50/50 with water. Drops are becoming less when I increase the flow. But then I have multiple cyl (randomly 1 2 3 5) misfires at 5500rpm. If I increase further the flow the rpm decrease. I am sure the flow isn't too much, running snow perf N54 dedicated kit. Is it due to worn plugs? I am FBO, 80Kmiles, status of plugs unknown, coming from previous owner
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06-16-2015, 09:34 AM	#2
Milan Captain 202 Rep 649 Posts Drives: F80 M3 Join Date: May 2014 Location: Boise, ID iTrader: (7)	Could be plugs or it could be from too much water and/or not enough timing. Why did you do a meth kit before plugs? SMH __________________ 17 M3 Comp
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06-16-2015, 10:17 AM	#3
BQTuning Banned 469 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	What tuning platform are you on, MHD or COBB ?
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06-17-2015, 03:32 AM	#4
marconi118 Major 94 Rep 1,184 Posts Drives: 06/07 e93 335i Join Date: Nov 2008 Location: europe iTrader: (0)	simple fash with bb... logging with JB4
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06-17-2015, 08:31 AM	#5
j1gilles Captain 51 Rep 719 Posts Drives: 2009 335xi Join Date: Feb 2013 Location: Chicago iTrader: (0)	Check plugs/plug gap __________________ ASE master tech (many moons ago)335xi- JB4 G5 iso/e50 custom flash/Custom meth/Borla mids/Custom x-pipe/DCI/ER charge pipe/Dual Ebay BOV's/Alpina B3 flash/Paddle shifter retro fit
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06-17-2015, 08:52 AM	#6
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	which nozzles are u running? might be your trims get so negative that it triggers misfire __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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06-18-2015, 03:17 AM	#7
marconi118 Major 94 Rep 1,184 Posts Drives: 06/07 e93 335i Join Date: Nov 2008 Location: europe iTrader: (0)	375ml/min nozzle. Trims are fine will NJK plugs help?
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