"Pending" P030X codes, occasional engine misfire

[jfoj]

Originally Posted by upallnight

OBD II readiness was implemented to prevent people from clearing the codes that are present in their cars prior to taking the car in for testing.

Another part of OBDII was non volatile memory. Most was implemented with capacitor back up, but unlike OBD1, there was no disconnecting the battery to clear codes. Clearing/Resetting Adaptations is not part of clearing codes.

Originally Posted by upallnight

Well, Rookie has been uploading logs and the logs that were made after he cleared the code shows the long term fuel trim at 0, and it took quite a bit of time for the fuel trim to go from 0 to positive.

The last log Rookie uploaded was a log without a clear code prior to the logging, and if you bother to look at the log it showed the long term fuel trim at a positive value and NOT starting from 0.

Rookie's vehicle has a rather unusual problem based on what I am seeing. Part of his problem may well be the fuel management system is doing bad things. Some things are not adding up the data that I am seeing, but I need to go over it again and look for some more clues.

Originally Posted by upallnight

Now Ottoi from Bavauto stated that you can reset fuel trims with clearing the code and Ross Tech said that you can reset fuel trims with clearing the code and Rookie has been resetting the fuel trim with clearing the code, seems like you're the one that don't get it.

You're right about one thing, it cold outside and I'm not going to be playing around with my X when it is working perfect.

Sorry but Otto and Ross Tech either mis-spoke and/or were/are wrong. People make mistakes all the time and things are stated incorrectly or incorrect info is put into print. I often verify things for myself because I have been involved in MANY industries where I have found plenty of incorrectly stated and documented things. Everything from bad/wrong info in service manuals, both factory and aftermarket, wrong specs, typos, you name it, I usually verify multiple times for myself how things behave.

What I do not understand is why you have never bothered to verify ANYTHING for yourself. You only are a master of the quoting things from the Internet.

Oh, I forgot, everything on the Internet is always correct!