4.8i Behaving Strangely - Codes

[thesamiest]

Originally Posted by ard

How are your short and long term fuel trims????

Look up some posts by Alphabeta in the last two months about this.....

I do not know. I will have to ask, or look at them personally.

As suspected the 2D32 - Differential Pressure Sensor code has come back, the 2B70 - Variable induction manifold and the 29F5 Catalytic-Converter Conversion Bank 2 remain.

[thesamiest]

Originally Posted by wsmeyer

When you say "throttle harness" are you talking about the connection to the throttle body?

If not, check out this page of RealOEM:

RealOEM.com - Online BMW Parts Catalog

I occasionally have some weird thing where the engine seems to stutter. I ran across that a while back and the part was $19 so I did it. Didn't help me though.

Mine is so infrequent it has proved impossible to track down. I even purchased a BluDriver so I could log everything but even in the logs I can't spot anything fishy when it happens.

Yes the throttle harness that connects to the throttle body. I would have given them the green light if they wanted to change the entire wiring.

[ard]

Originally Posted by thesamiest

I do not know. I will have to ask, or look at them personally.

As suspected the 2D32 - Differential Pressure Sensor code has come back, the 2B70 - Variable induction manifold and the 29F5 Catalytic-Converter Conversion Bank 2 remain.

The cat is NOT a digital device. It isnt an electronic device.

As a result a 'cat conversion code' is triggered when values at the pre and post cat O2 sensors are out of whack.

When a car is running extremely rich, the O2 sensors can report values which the DME interprets as "the cat isnt working right". Cat may be fine.

You (or your shop) needs to do more than chase codes...

GL

[thesamiest]

Originally Posted by ard

The cat is NOT a digital device. It isnt an electronic device.

As a result a 'cat conversion code' is triggered when values at the pre and post cat O2 sensors are out of whack.

When a car is running extremely rich, the O2 sensors can report values which the DME interprets as "the cat isnt working right". Cat may be fine.

You (or your shop) needs to do more than chase codes...

GL

The cat code came up after the car developed a misfire from a clogged injector, so that was just my assumption. Since the other issues have been present on and off for more than 7 months, that only came up recently. I am all for doing more than chase codes, but i am afraid that's something that i need to learn if i want to contribute more personally ( which is what i'm trying to do ). The worst part is that the shops, dealer and pretty much everyone around here seems to be doing no more than chase codes (at best). I've contemplated sending the car out of the country for a more proper diagnosis, but with all that it has gone into it i don't think it is worth it.

The car had no issues and all suddenly is now going into limp mode consistently and throwing the usual iDrive errors, just as an experiment i'll report back when the manifold is swapped whether the differential pressure sensor code is gone, from what i have experienced, simply changing that will get rid of the limp mode issue and the slow/bogged throttle for quiet some time. The issue has been highly inconvenient but fascinating also as it has poked that side of my curiosity that really wants to know.

Thank you for all your insight, really appreciate it. If there is anything else you think of let me know.

[ard]

what country?