Quote:
Originally Posted by jfoj
upallnight, you do not get it. If Otto wrote the article he was wrong or not clear on what he was communicating.
Clearing DTC's WILL NOT UNDER ANY CIRCUMSTANCES CLEAR OR RESET FUEL TRIMS. Read, rinse and repeat. Put in the spin cycle if needed.
So what you are posting above from grego151 may or may not have been after any codes were cleared.
BUT, if you PAY ATTENTION and know anything about OBDII, look closely at Fuel System Status 1 & 2, notice they are in State #8. State number 8 is an error state and the engine will default to a non feedback fuel control and will use default fuel and ignition maps. Fuel System Status 8 = Open loop due to system failure.
Oh, BTW, few OBDII tools show, track or Log Fuel System Status, OBDFusion does. And you can specifically thank me for this feature being in current versions of OBDFusion. Few tools, even Pro level tools offer this basic but very important PID.
But also keep this in mind, if gregoo151 did provide another Log it could have very different Fuel Trim info due to a few reasons.
1. Fuel trims are dynamic and Adapt. They change over time and conditions.
2. The shop that greggo151 may have specifically cleared or reset the Adaptations with a BMW specific or Pro level scan tool.
But what you are showing above is clearly when the vehicle was not operating correctly and the System Fuel System status was in Open loop due to system failure.
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If you know anything about OBD II you would have known that greggo151 cleared the trouble code(s).
This was part of his scan:
This vehicle is not ready for emissions testing.
Reason
MIL On
Stored trouble codes have been detected
Number of incomplete tests exceeds the maximum number allowed
Trouble Code Report
The reason for any incomplete test is because he erased the code(s).
Looks like another one of those time that we agree to disagree. You can believe what you want and I can believe what I want. The people that read this thread can decides who they want to believe.