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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, May-05-2011, 10:48:37 PM   #1
DemonTweaks
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Thumbs down Running lean on bank 1...

At least that's the only code that ever come up says.
Only happen once though.
The car however is, and have since I've gotten it, always 'missed' on really light throttle at cruising. And 'pings' some at light throttle too going up hills at low rpm.

It's not ignition, I've replaced EVERYTHING with new.

Not OEM software.
The later made it even worse after BMW 'upgraded' the software for emissions. I've installed a Shark tuner since and it was good at first but it seams that it adapts itself to run to lean or something!

Not the pedal, does it on cruise control too.

This is really annoying so anybody experience the same?

1; I'm thinking next might be pulling injectors and have them all cleaned/balanced. And throw away the K&N filter/inlet previous owner installed. (anybody want to trade OEM for it?)

2; Swap bank 1 & 2 lambda sensors (O2) to see if he messed with them too (lots of small stupid things been eefed with already...) and off course didn't get back in the right order.
(Where are the connectors for them located? Don't want to lift the whole car and pull all skidplates etc. to swap them in the pipes.)
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Old Fri, May-06-2011, 01:46:54 AM   #2
bmw loe
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Default Re: Running lean on bank 1...

its located on top of ignition coil #5 and #6 for the pre-cat
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Old Fri, May-06-2011, 01:55:15 AM   #3
tkeane
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Default Re: Running lean on bank 1...

Another thing to check that could cause this is a dirty or damaged MAF sensor.
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Old Fri, May-06-2011, 04:14:47 PM   #4
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Default Re: Running lean on bank 1...

Quote:
Originally Posted by tkeane View Post
Another thing to check that could cause this is a dirty or damaged MAF sensor.
Did clean it already. Forgot to mention it. Thanks though!

I'll check under my coil cover and will try to swap them around.
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Old Fri, May-06-2011, 04:40:27 PM   #5
M302_IMOLA
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Default Re: Running lean on bank 1...

are you throwing a P0174 code? If so, I had these code and it turned out to be a vacuum leak...I had a a slight leak where my aftermarket intake elbow attached.
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Old Fri, May-06-2011, 05:19:58 PM   #6
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Default Re: Running lean on bank 1...

Just FYI...I don't think the harness connector between bank 1 and bank 2 pre-cats O2 sensers are interchangeable. The harness connector is shaped differently and designed that way to be fool-proof
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Discussing Running lean on bank 1... in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)