misfire only with tune...is that normal?

parabmw · 04-26-2014, 10:07 PM

I got thr p29cd misfire cyl 1.
I change the cyl1 plug and switched ign coil to cyl2 to see if coil was bad.
I noticed some oil in plug sleeve and on ign coil for 2 cyl.

so now I got p29cd and p29ce cyl2 misfire.
so ign coilbwas bad but cyl1 should be fine.

should I go ahead and change all ign coils?
how long to they last?

or take it to dealer if I can get codes to appear after cobb uninstall.
car is under cpo.

also there is oil in the holes beside the ign coil. not sure what the hole is.
how does the plug look?

parabmw · 04-27-2014, 01:30 PM

tried cobb stg 0 stock map. no misfires.
is that normal to have misfires only with maps?
what could cause it?

tc535i · 04-27-2014, 01:38 PM

Tune is more aggressive than stock, so while your components may just barely handle stock requirements, the agressive tune is too much. Start with new plugs.

tc535i · 04-27-2014, 01:38 PM

Oil on the plugs means your valve cover gasket is shot

parabmw · 04-27-2014, 10:19 PM

no misfires with stg 1 sport. so far had misfires with stg 1+ fmic sport and agressive. both on 94oct.

atheis · 04-27-2014, 10:22 PM

had the same issue on cyl 6. just changed all plugs and 1 coilpack. good to go.

BAL278 · 04-28-2014, 08:53 AM

yeah, I just swapped all my coil packs and that did the trick, was researching and I think they last around 40-45k miles for a tuned car (not 100% sure on that one as mine had a LOT more miles than that)

but you seem to have a bigger issue than just coils, looks like your valve cover gasket is shot

Tiago@VRSF · 04-28-2014, 09:13 AM

It's normal to throw a misfire with a tune vs without, just make sure to swap the bad coils and log a couple runs so you can make sure there's nothing out of the ordinary.

parabmw · 05-04-2014, 03:37 PM

changed plugs...no more misfires

007_e350 · 05-04-2014, 05:57 PM

I just did the valve cover gasket, theres a diy by Rob ... $36 gasket, 4 - 6 hrs (i take my sweet time) - also look for any cracks in the valve cover itself when u take off ... becareful with fuel rails, triple check all screwed tight, drips from there could mean fire

oil in the cylinder cd mean head gasket leak I heard, open ur cooler bottle and see if it has any milky stuf, oil mixing w coolant

04-26-2014, 10:07 PM	#1
parabmw Major 169 Rep 1,039 Posts Drives: 2018 m4 Join Date: Aug 2013 Location: canada iTrader: (0)	misfire only with tune...is that normal? I got thr p29cd misfire cyl 1. I change the cyl1 plug and switched ign coil to cyl2 to see if coil was bad. I noticed some oil in plug sleeve and on ign coil for 2 cyl. so now I got p29cd and p29ce cyl2 misfire. so ign coilbwas bad but cyl1 should be fine. should I go ahead and change all ign coils? how long to they last? or take it to dealer if I can get codes to appear after cobb uninstall. car is under cpo. also there is oil in the holes beside the ign coil. not sure what the hole is. how does the plug look? Attached Images Last edited by parabmw; 04-27-2014 at 01:29 PM..
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04-27-2014, 01:30 PM	#2
parabmw Major 169 Rep 1,039 Posts Drives: 2018 m4 Join Date: Aug 2013 Location: canada iTrader: (0)	tried cobb stg 0 stock map. no misfires. is that normal to have misfires only with maps? what could cause it?
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04-27-2014, 01:38 PM	#3
tc535i Lieutenant Colonel 215 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	Tune is more aggressive than stock, so while your components may just barely handle stock requirements, the agressive tune is too much. Start with new plugs.
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04-27-2014, 01:38 PM	#4
tc535i Lieutenant Colonel 215 Rep 1,818 Posts Drives: 2007 335i, 2001 330i, 1995 M3 Join Date: Sep 2013 Location: West Los Angeles iTrader: (1)	Oil on the plugs means your valve cover gasket is shot
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04-27-2014, 10:19 PM	#5
parabmw Major 169 Rep 1,039 Posts Drives: 2018 m4 Join Date: Aug 2013 Location: canada iTrader: (0)	no misfires with stg 1 sport. so far had misfires with stg 1+ fmic sport and agressive. both on 94oct.
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04-27-2014, 10:22 PM	#6
atheis New Member 4 Rep 29 Posts Drives: 2007 e90 TiAg 335i Join Date: Jul 2009 Location: sf bay area iTrader: (0)	had the same issue on cyl 6. just changed all plugs and 1 coilpack. good to go.
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04-28-2014, 08:53 AM	#7
BAL278 Major 48 Rep 1,010 Posts Drives: E92 335xi JB Join Date: Jun 2011 Location: North NJ iTrader: (3)	yeah, I just swapped all my coil packs and that did the trick, was researching and I think they last around 40-45k miles for a tuned car (not 100% sure on that one as mine had a LOT more miles than that) but you seem to have a bigger issue than just coils, looks like your valve cover gasket is shot __________________ 2008 335xi Jet Black//Coral Red VTT Stage 1+// Procede V5//VRSF DPs//AMS FMIC//KW V1//M3 Sways & Sub Bushings// Alpina AT flash Apex EC-7//Michelin PSS//Dinan CAI
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04-28-2014, 09:13 AM	#8
Tiago@VRSF 2095 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	It's normal to throw a misfire with a tune vs without, just make sure to swap the bad coils and log a couple runs so you can make sure there's nothing out of the ordinary.
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05-04-2014, 03:37 PM	#9
parabmw Major 169 Rep 1,039 Posts Drives: 2018 m4 Join Date: Aug 2013 Location: canada iTrader: (0)	changed plugs...no more misfires
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05-04-2014, 05:57 PM	#10
007_e350 Lieutenant Colonel 217 Rep 1,909 Posts Drives: 335i 2008 MHD'd / x5d E70 Join Date: May 2013 Location: left lane iTrader: (3)	I just did the valve cover gasket, theres a diy by Rob ... $36 gasket, 4 - 6 hrs (i take my sweet time) - also look for any cracks in the valve cover itself when u take off ... becareful with fuel rails, triple check all screwed tight, drips from there could mean fire oil in the cylinder cd mean head gasket leak I heard, open ur cooler bottle and see if it has any milky stuf, oil mixing w coolant Last edited by 007_e350; 05-04-2014 at 06:12 PM..
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