CEL while Cobb installed

babbagandu · 06-09-2014, 02:28 PM

Before installing my Cobb tune, I had taken the car to the dealer complaining about a hesitation on acceleration and also a problem with the CEL coming on and the engine misfiring. They replaced one of the coils

After installing the Cobb the misfiring happened again. I uninstalled and took it back to the dealer. But they are telling me they don't see any issues with the car.

Can they not see that the CEL came on? I thought a log was kept for every time that happened but I didn't want to mention anything in case the Cobb cleared it or something. Does anyone know?

AlanYoro35i · 06-09-2014, 02:34 PM

Cobb clears all code upon installing or uninstalled. Next time when u installed cobb and you trigger a cel, use the code reader function to read what codes you have. A CEL after cobb can be alot of things since the car is running higher power, weakness are bound to be exposed.

JStang · 06-09-2014, 02:56 PM

When were your spark plugs last replaced? What codes is your Cobb AP showing?

techwhiz · 06-09-2014, 03:03 PM

A Cobb clears codes on removal. The ECU gets reset. The only thing that may survive the reset is shadow codes.

I suspect your plugs.
A Cobb tune (any tune actually) with show weakness in the ignition system.
Random misfire diagnosis should start with a plug swap if the plugs have more than 20K miles.

ken1137 · 06-09-2014, 04:29 PM

watch the vid:

http://www.cobbtuning.com/BMW-335i-x...ive-s/1200.htm

06-09-2014, 02:28 PM	#1
babbagandu New Member 2 Rep 21 Posts Drives: 335i coupe Join Date: Mar 2011 Location: USA iTrader: (0)	CEL while Cobb installed - cleared upon restoring to stock?? Before installing my Cobb tune, I had taken the car to the dealer complaining about a hesitation on acceleration and also a problem with the CEL coming on and the engine misfiring. They replaced one of the coils After installing the Cobb the misfiring happened again. I uninstalled and took it back to the dealer. But they are telling me they don't see any issues with the car. Can they not see that the CEL came on? I thought a log was kept for every time that happened but I didn't want to mention anything in case the Cobb cleared it or something. Does anyone know?
	Appreciate 0 Tweet Quote

06-09-2014, 02:34 PM	#2
AlanYoro35i Senior Troll 224 Rep 3,378 Posts Drives: Coming soon-718 Cayman S Join Date: Aug 2010 Location: South West iTrader: (1)	Cobb clears all code upon installing or uninstalled. Next time when u installed cobb and you trigger a cel, use the code reader function to read what codes you have. A CEL after cobb can be alot of things since the car is running higher power, weakness are bound to be exposed.
	Appreciate 0 Quote

06-09-2014, 02:56 PM	#3
JStang Brigadier General 562 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	When were your spark plugs last replaced? What codes is your Cobb AP showing?
	Appreciate 0 Quote

06-09-2014, 03:03 PM	#4
techwhiz Colonel 453 Rep 2,973 Posts Drives: e90 335i Sedan - Arctic Join Date: Feb 2012 Location: Bay Area, Ca iTrader: (4)	A Cobb clears codes on removal. The ECU gets reset. The only thing that may survive the reset is shadow codes. I suspect your plugs. A Cobb tune (any tune actually) with show weakness in the ignition system. Random misfire diagnosis should start with a plug swap if the plugs have more than 20K miles. __________________ Arctic Metallic\CF Splitters, Spoiler, Mirror Covers\LED Tails\LSD\Tinted\Coded\Apex Square SM10-19"\LED Angel Eyes\Gloss Black Grill\Integrated V1 & Galaxy Tab\M-Performance Brakes\Cobb Tuned\xHP Flash\Resonator Removed and -> is your friend.
	Appreciate 0 Quote

06-09-2014, 04:29 PM	#5
ken1137 Brigadier General 89 Rep 3,732 Posts Drives: BMW S1000XR Join Date: Jun 2011 Location: Gilbert, AZ iTrader: (7) Garage List 2009 e90 335i [6.40]	watch the vid: http://www.cobbtuning.com/BMW-335i-x...ive-s/1200.htm __________________ BMWCCA member
	Appreciate 0 Quote