Cocktail of 3.0i Trouble Codes - Where to Begin?

[richardb]

Originally Posted by Overboost

Check MAF g/s values first. Should be in the 3 g/s at idle with no additional power draws, i.e.: no AC, lights, radio, blower fan, etc. 4g/s is too high

Secondly check your fuel pressure, should be around 52 PI Max.

Here are the BMW trouble codes using the C310 tool:

99 Oyxgen-sensor voltage behind cat converter, bank 2
EB Trimming, oxygen sensor before cat converter, bank 1
BF Insufficient heat output, oxygen sensor behind cat converter, bank 2
F3 Misfire, cylinder 6
F2 Misfire, cylinder 5

Checked out the other readings:

Idling the car with lights on last night, voltage at air-mass flow sensor 0.9 V

Air mass reading 18kg/h while idling
Air mass reading 44 kg/h at 2,000 rpm
Air mass reading 55 kg/h at 2,600 rpm


Finally, the oxygen sensors:

Bank 1 before cat: voltage 0.11 to 0.76 V
Bank 2 before cat: voltage 0.11 to 0.76 V
Bank 1 after cat: voltage 0.11 to 0.76 V
Bank 2 after cat: voltage frozen at 0.58 to 0.59 V

Voltage appears static at the bank 2 oxygen sensor after the cat, when it should be fluctuating up and down like the other 3.

[richardb]

Additional info from the data stream:

adaptation, mixture, additive bank 1: -0.11 ms
adaptation, mixture, additive bank 2: -0.02 ms
adaptation, mixture, bank 1 multiplicative: 5.8%
adaptation, mixture, bank 2 multiplicative: 6.9%

[upallnight]

Originally Posted by richardb

Here are the BMW trouble codes using the C310 tool:

99 Oyxgen-sensor voltage behind cat converter, bank 2
EB Trimming, oxygen sensor before cat converter, bank 1
BF Insufficient heat output, oxygen sensor behind cat converter, bank 2
F3 Misfire, cylinder 6
F2 Misfire, cylinder 5

Checked out the other readings:

Idling the car with lights on last night, voltage at air-mass flow sensor 0.9 V

Air mass reading 18kg/h while idling
Air mass reading 44 kg/h at 2,000 rpm
Air mass reading 55 kg/h at 2,600 rpm


Finally, the oxygen sensors:

Bank 1 before cat: voltage 0.11 to 0.76 V
Bank 2 before cat: voltage 0.11 to 0.76 V
Bank 1 after cat: voltage 0.11 to 0.76 V
Bank 2 after cat: voltage frozen at 0.58 to 0.59 V

Voltage appears static at the bank 2 oxygen sensor after the cat, when it should be fluctuating up and down like the other 3.

Voltage should not be fluctuating wildly for 02 sensor after the cat. The fact that your 02 sensor is varying the voltage leads me to think you have a bad 02 sensor but at bank 1 not bank 2.

Also your MAF 18K/hour equates to 18,000/3600 = 5g/s. 5g/s at idle is kind of high so. If you look at the video I posted, my MAF g/s was 3.6g/s at 700 rpm.
I think your MAF is over-reporting the airflow through it and the computer is trying to compensate for this data pid. You can try cleaning the MAF with MAF cleaner, don't use carb cleaner and make sure it is dried before starting the engine. Don't buy a cheap MAF from eBay or Amazon. Better to go to a junkyard and buy a genuine Siemens MAF.