Quote:
Originally Posted by rjahl
Not sure what logging tool you are using to debug but there are only two maybe three apps out there that know how to pull the data quickly enough to be useful. Some of the slow ones will actually fill in the missing data with lagged or erroneous data.
Personally, I like to use INPA and Testo for logging. Bimmer geeks tool should work but I've never personally tried it.
The DME adjust fueling in real time, by calculating how much air flow is expected and adjusting from 02 feedback. If the adjustments exceed the maximum allowed, you get the DTC.
It seems the DME is calculating and fueling for more air flow then you are actually getting. Then trimming based on information from the 02 sensors. Are you running any type of a special air intake or intake hose that could affect you MAF sensor readings? Are running an oiled air filter? Do you have any exhaust leaks, we've seen an upstream exhaust leak affect the 02 sensors in strange ways. I would first look for single source problems such as these.
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Thanks for the info! Can you give me INPA and Testo model numbers? I’m using Autel Autolink AL519.
Your description of what the DME does matches my understanding.
No, not running anythink other than stock air intake and hose. No exhaust leaks. The air filter is standard and I just changed it in case that was a problem, but it made no difference.
I pulled out the MAP sensor yesterday, and it seemed a bit oily, which seems wrong.
Any other ideas for me? Do you know if my idle MAF readings are good?