Trying to get to the bottom of all my problems 04 530i

[TehPirat3]

I posted a couple weeks ago asking for help for my issues and have been trying to find the root cause despite everything I've tried.

The problem:
rough idle for about a minute from cold
rough idle for about 10 seconds from warm
occasional stalling when letting off acceleration going to 0 mph
occasional stalling when going from cold immediately
poor (but better than before) fuel economy
adding quart of oil once 1-2 week(s)


Here are the OBD codes:
P0172 (bank 1 rich) (pending and stored)
P0175 (bank 2 rich) (pending and stored)
P0700 (transmission control system) (stored)
P2197 (O2 B2S1 biased/lean) (pending and stored)
P2195 (O2 B1S1 biased/lean) (pending and stored)
P16C1 (torque issue) (stored)
P0982 (shift solenoid D, working on fixing now) (pending and stored)

attached are the fault codes from INPA

What I've done:
Replaced pre-cat O2 sensors
Checked spark plugs
Swapped ignition coils
Replaced MAF
Repaired DISA Valve (damaged o-ring)
Cleaned throttle body
Cleaned air intake manifold + new filter
Cata-clean x1
Fuel injector cleaner x1
Octane booster x1 (thought maybe it'll help, no difference)
Dry gas treatment x2
Checked common vacuum leaks, nothing found

The car sat for about 2 years outside but was moved occasionally to avoid parking tickets (parked on street, limited space garage). At purchase the only code was for the O2 sensors which were original with 132k miles. The car appears to make a "gargling" kind of sound, most noticeable during acceleration outside the car (can't hear it inside with windows up). Before the throttle body cleaning I was getting around 16 MPG, not it's about 20 MPG. There appeared to be oil buildup in the throttle body. When I took the DISA valve off there was a lot of dry oil buildup in that compartment but I'm not sure if that's appropriate. The car now has 135k miles.

[jclausen]

Clear all the faults run the car and recheck, you certainly will not fix it by throwing parts at it, then start over.

[pimpmyride101]

That's a ton of oil you're losing. Do you have smoke out the tailpipe? If that's burning oil and it's that much, you can clog up your exhaust ports which would cause a rich condition. Depending on how long that's been happening I've seen BMWs with the exhaust ports restricted so bad from carbon that they were about half the size. There's a good fast way of checking for exhaust restriction before the O2, but its a specialized piece of equipment and not cheap or easy to use (pressure transducer/oscilloscope). Rich conditions are almost always caused by an error with a sensor or something else and they're usually not real rich conditions, but because you're losing that much oil and if its being burned I would remove the exhaust manifold and check the ports.

[White94RX]

Have you replaced the crankcase vent valve and the associated hoses?

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