Misfire in cylinder 3 with Cobb AP

KG3356MT · 08-19-2011, 07:42 PM

Hey guys. I am having some issues with my car? So here's the stroy. I have been having misfire codes with my Cobb AP on the latest 93 oct map. I have been to the dealer with the car. I have had the fuel pump changed and all coils. Still keeps misfiring. The car only misfires at WOT. When I uninstall the COBB and run stock... no misfire. My car has been in the shop more than on the street and I have only had the car since march of this year. It's starting to get to me. Anyway sorry for the rant lol. Just wondering what to do next so looking for some advice. By the way my car is an 2007 335i 6MT with 26,000 miles on it. Thanks for your help.

COBB Tuning · 08-19-2011, 07:46 PM

Quote:

Originally Posted by KG3356MT

Hey guys. I am having some issues with my car? So here's the stroy. I have been having misfire codes with my Cobb AP on the latest 93 oct map. I have been to the dealer with the car. I have had the fuel pump changed and all coils. Still keeps misfiring. The car only misfires at WOT. When I uninstall the COBB and run stock... no misfire. My car has been in the shop more than on the street and I have only had the car since march of this year. It's starting to get to me. Anyway sorry for the rant lol. Just wondering what to do next so looking for some advice. By the way my car is an 2007 335i 6MT with 26,000 miles on it. Thanks for your help.

Hey bud, sorry to hear you are having issues! The root of the problem is likely tired spark plugs. BMW set a pretty optimistic service interval for them and the dealerships seem to replace them last after everything else when diagnosing misfiring issues. Making significantly more power than stock taxes the ignition system much harder, so mechanical weaknesses will be exposed that may not be observed on the factory tune.

Try a set of new plugs and let us know how it goes

Thank you very much for your support and please let us know if we can be of assistance in any other way.

Best regards

Lance

KG3356MT · 08-19-2011, 07:48 PM

Thanks. So I go with stock plugs or colder aftermarket plugs?

ufgtrs2007 · 08-19-2011, 07:53 PM

Quote:

Originally Posted by KG3356MT

Thanks. So I go with stock plugs or colder aftermarket plugs?

Stock plugs

KG3356MT · 08-19-2011, 08:16 PM

Thanks for the help everyone.

Jeffman · 08-24-2011, 01:45 AM

Quote:

Originally Posted by KG3356MT

Thanks for the help everyone.

OP - just curious, but did the new spark plugs solve your problem?

KG3356MT · 08-24-2011, 04:45 AM

Quote:

Originally Posted by JHR

Quote:

Originally Posted by KG3356MT

Thanks for the help everyone.

OP - just curious, but did the new spark plugs solve your problem?

Needed coils and new plugs. Car still feels better stock though.

secretsquirrel · 08-24-2011, 07:23 AM

Quote:

Originally Posted by KG3356MT

Needed coils and new plugs. Car still feels better stock though.

I'm guessing you reloaded the AP after getting new coils and plugs? And it still feels better stock?

enrita · 08-24-2011, 07:31 AM

did you try the v203 maps ? seems the V300 are not 100%

KG3356MT · 08-24-2011, 10:50 AM

I have all the newest maps on the AP. No more misfire but the car just feels better stock. I honestly had enough with the car so I'm selling the car and the AP and moving on. Thanks for everyone's help. I really like this forum.

FastBimmerN54 · 08-24-2011, 10:55 AM

Quote:

Originally Posted by KG3356MT

I have all the newest maps on the AP. No more misfire but the car just feels better stock. I honestly had enough with the car so I'm selling the car and the AP and moving on. Thanks for everyone's help. I really like this forum.

What do you mean the car just feels better stock? Genuinely curious.

KG3356MT · 08-24-2011, 11:12 AM

Quote:

Originally Posted by FastBimmerN54

Quote:

Originally Posted by KG3356MT

I have all the newest maps on the AP. No more misfire but the car just feels better stock. I honestly had enough with the car so I'm selling the car and the AP and moving on. Thanks for everyone's help. I really like this forum.

What do you mean the car just feels better stock? Genuinely curious.

Yeah it feels more responsive stock. While with the Cobb it feels like the car is stuttering. Sorry if I am not explaining it correctly.

FastBimmerN54 · 08-24-2011, 11:17 AM

Quote:

Originally Posted by KG3356MT

Yeah it feels more responsive stock. While with the Cobb it feels like the car is stuttering. Sorry if I am not explaining it correctly.

Just trying to help.... have you had your injectors replaced or HPFP recently?

When your saying response do you mean when you first get on the gas out of boost or the response of full boost?

Rob@Cobb · 08-24-2011, 11:27 AM

Quote:

Originally Posted by KG3356MT

Yeah it feels more responsive stock. While with the Cobb it feels like the car is stuttering. Sorry if I am not explaining it correctly.

It always sucks to have issues. Can we still be of help to you? Which maps are you running v203s or v300s?

Cheers,
Rob

mithiral67 · 08-24-2011, 12:03 PM

Quote:

Originally Posted by KG3356MT

Yeah it feels more responsive stock. While with the Cobb it feels like the car is stuttering. Sorry if I am not explaining it correctly.

I hear ya. I felt the exact same way with all the piggyback options. I was looking to switch to a m3 until cobb came along. Its the only reason I still have a straight six over a v8.

tibra1 · 08-24-2011, 12:07 PM

GIAC>>a beast of a tune and smooth

mmbacon · 08-31-2011, 07:49 PM

having same problem with cobb about to take to dealer having a cylinder 5 misfire
and wen i uninstall the cobb it feels great and dosent throw any codes
ive seen a lot of people have this problem

which is making me question is this worth the hassle

KG3356MT · 08-31-2011, 11:09 PM

Quote:

Originally Posted by mmbacon

having same problem with cobb about to take to dealer having a cylinder 5 misfire
and wen i uninstall the cobb it feels great and dosent throw any codes
ive seen a lot of people have this problem

which is making me question is this worth the hassle

I hear you. Put the car back to stock for now until I sell the car.

Forcefed3 · 08-31-2011, 11:15 PM

Quote:

Originally Posted by KG3356MT

I hear you. Put the car back to stock for now until I sell the car.

What are you going to get?

E90E · 08-31-2011, 11:18 PM

What I have noticed with Cobb, it is a great product first of all, but for a stock car in hot weather (Anything above 65 fahrenheit) with just the AP on it, run the 91 map. The 93 octane map is too aggressive. I had misfires with 93 octane map on a car with 15,000 miles, switched to 91 octane map without changing anything and the car runs beautifully, the 93 octane map is probably ok on a car with ic,dp but on a stock car it is just too damn aggressive. I may not know much about different tunes, but this is from what I have observed, tune on car for about 5,000 miles.

KG3356MT · 09-01-2011, 01:29 AM

Quote:

Originally Posted by Forcefed3

Quote:

Originally Posted by KG3356MT

I hear you. Put the car back to stock for now until I sell the car.

What are you going to get?

Looking at m3

KG3356MT · 09-01-2011, 01:33 AM

Sorry for double post. I really like the 335i but I don't feel like dealing with a modified car. So I plan to go m3 and just leave it stock. I still love 335i's though. Great cars with great potential.

08-19-2011, 07:42 PM	#1
KG3356MT Second Lieutenant 23 Rep 292 Posts Drives: 2015 435i Xdrive M Sport Join Date: Apr 2011 Location: NYC iTrader: (1)	Misfire in cylinder 3 with Cobb AP Hey guys. I am having some issues with my car? So here's the stroy. I have been having misfire codes with my Cobb AP on the latest 93 oct map. I have been to the dealer with the car. I have had the fuel pump changed and all coils. Still keeps misfiring. The car only misfires at WOT. When I uninstall the COBB and run stock... no misfire. My car has been in the shop more than on the street and I have only had the car since march of this year. It's starting to get to me. Anyway sorry for the rant lol. Just wondering what to do next so looking for some advice. By the way my car is an 2007 335i 6MT with 26,000 miles on it. Thanks for your help. __________________ 2015 435i Xdrive Black on Black with loaded
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08-19-2011, 07:48 PM	#3
KG3356MT Second Lieutenant 23 Rep 292 Posts Drives: 2015 435i Xdrive M Sport Join Date: Apr 2011 Location: NYC iTrader: (1)	Thanks. So I go with stock plugs or colder aftermarket plugs? __________________ 2015 435i Xdrive Black on Black with loaded
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08-19-2011, 08:16 PM	#5
KG3356MT Second Lieutenant 23 Rep 292 Posts Drives: 2015 435i Xdrive M Sport Join Date: Apr 2011 Location: NYC iTrader: (1)	Thanks for the help everyone. __________________ 2015 435i Xdrive Black on Black with loaded
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08-24-2011, 07:31 AM	#9
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	did you try the v203 maps ? seems the V300 are not 100% __________________ 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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08-24-2011, 10:50 AM	#10
KG3356MT Second Lieutenant 23 Rep 292 Posts Drives: 2015 435i Xdrive M Sport Join Date: Apr 2011 Location: NYC iTrader: (1)	I have all the newest maps on the AP. No more misfire but the car just feels better stock. I honestly had enough with the car so I'm selling the car and the AP and moving on. Thanks for everyone's help. I really like this forum. __________________ 2015 435i Xdrive Black on Black with loaded
	Appreciate 0 Quote

08-24-2011, 12:07 PM	#16
tibra1 Banned 127 Rep 6,773 Posts Drives: 2011 ZCP M3 - 2007 335i crashd Join Date: Apr 2009 Location: NYC iTrader: (4)	GIAC>>a beast of a tune and smooth
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08-31-2011, 07:49 PM	#17
mmbacon Bacon is soooooo Good 35 Rep 135 Posts Drives: M2,M5C Join Date: Apr 2011 Location: NYC iTrader: (1)	having same problem with cobb about to take to dealer having a cylinder 5 misfire and wen i uninstall the cobb it feels great and dosent throw any codes ive seen a lot of people have this problem which is making me question is this worth the hassle
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08-31-2011, 11:18 PM	#20
E90E Private First Class 10 Rep 179 Posts Drives: 2009 335i Join Date: Jul 2010 Location: You Know Where iTrader: (1)	What I have noticed with Cobb, it is a great product first of all, but for a stock car in hot weather (Anything above 65 fahrenheit) with just the AP on it, run the 91 map. The 93 octane map is too aggressive. I had misfires with 93 octane map on a car with 15,000 miles, switched to 91 octane map without changing anything and the car runs beautifully, the 93 octane map is probably ok on a car with ic,dp but on a stock car it is just too damn aggressive. I may not know much about different tunes, but this is from what I have observed, tune on car for about 5,000 miles.
	Appreciate 0 Quote

09-01-2011, 01:33 AM	#22
KG3356MT Second Lieutenant 23 Rep 292 Posts Drives: 2015 435i Xdrive M Sport Join Date: Apr 2011 Location: NYC iTrader: (1)	Sorry for double post. I really like the 335i but I don't feel like dealing with a modified car. So I plan to go m3 and just leave it stock. I still love 335i's though. Great cars with great potential. __________________ 2015 435i Xdrive Black on Black with loaded
	Appreciate 0 Quote