[e90335e36m3]

Since buying a second car I decided once again it would be a good idea to get my daily some more horsepower, but knowing full well that the last time I used the Cobb ECU the car misfired. So I sold that unit.

Today, I received another in the mail and the instant I took off with the Sport Map V401 the engine misfired and the engine went into limp mode. It threw 11 codes. Mind you, I had the car up to 130 stock just the day before and it drove like a dream.

After getting the codes, I turned the car off, reset the codes and drove on again business as usual. That is until I floored it and the car went nowhere.

The codes I got were:

P0300
P0303
P0304
P0306
P2AAF
P29CF
P29D0
P29D2
P29CC
P30FF (pre boost control, boost pressure to leak fron pressure line)


When the car is reset to stock, no Cobb it drives and pulls like crazy.

My goal is to basically have a car that has an ECU mod, intercooler, downpipes and an exhaust at 380-400 crank.

I don't think the plugs have ever been changed.


What course of action do you guys recommend besides the plugs? should I do coils, plugs and injectors all at one? Seems to be really expensive just to get a turn to run right.

tThanks.

[chepy24]

I would try plugs and go from there. Also check all connections I know it's stock and holding fine but with increased boost it'll bring to light some things that otherwise would have gone unnoticed. Also just as a Hail Mary check your charge pipe too

[e92_enthusiast_1]

Im assuming you mean Stg 1 Sport, what happens if you try Stg 1 Drive? Agree with Chepy24 though, plugs/coils would be my first suspects.

[e90335e36m3]

i can't recall but i tried the 91 octane setting and the 93 octane setting.

my car has 58k miles.

do you have any suggestions for discounted sourcing plugs and injectors?

[stanlalee]

No way in hell I'd buy injectors based on speculation (or coils for that matter). Anybody care to make out what those codes are. They should point you in the right direction.

[e92_enthusiast_1]

Plugs I just got mine on ebay, that came out cheapest for me. Injectors are pricey so I wouldn't necessarily start with that unless your 100% sure that's the issue. Coils are cheaper than injectors by a lot.

Originally Posted by e90335e36m3

i can't recall but i tried the 91 octane setting and the 93 octane setting.

my car has 58k miles.

do you have any suggestions for discounted sourcing plugs and injectors?

[chepy24]

you can get the plugs anywhere really i got mine from napa theyre just the bosh ones. theres a thread on how they are exactly the same minus the bmw stamp and tax....FWIW aggressive is for 93 drive and sport for 91 this could cause misfires.... if you are around e85 try a few gal mixed with 91 see if it helps

[vivanapoli806]

Buy oem plugs from a vendor on here. Try phil@reeves or getbmwparts. I switched from non oem to Bosch ZGR and now have misfire in 2 cylinders within couple hundred miles. Stick with oem they are $95-$100

[chepy24]

Originally Posted by vivanapoli806

Buy oem plugs from a vendor on here. Try phil@reeves or getbmwparts. I switched from non oem to Bosch ZGR and now have misfire in 2 cylinders within couple hundred miles. Stick with oem they are $95-$100

weird i have never heard of this... i thought they were the same exact thing minus the stamp and price....can anyone else chime in? im a couple hundred miles on mine and no issues at all

[e92_enthusiast_1]

Over 2k miles on regular Bosch ZGR6STE2 non OEM, switched in preparation for tune. Stg 2+ FMIC Sport not a single misfire so far.

Originally Posted by chepy24

weird i have never heard of this... i thought they were the same exact thing minus the stamp and price....can anyone else chime in? im a couple hundred miles on mine and no issues at all

[vivanapoli806]

There have been threads about it. Some people have had misfires and some haven't. The insides of the plugs are different. For couple bucks more I would rather just stick with oem since I never had misfires with them in the first place