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Old 02-01-2012, 10:51 AM   #50 (permalink)
needs more cowbell
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Originally Posted by SentraSE-R View Post
Dcb, you haven't read the thread. I cleared the MIL 800 miles and 4 months before the smog tests. I explained my car's history with the multiple misfire TCs. The ECU should have learned all it needed to during those 800 miles. The only major change to my xB between the two smog tests was that I lit the cat for 100 miles.
Originally Posted by SentraSE-R View Post
??? The two tests show consistently higher than average HC and NOx emissions from my car. ...

by me you can pay the emission station $20 for an ad hoc test. There may be a better way to kill your engine that doesn't make the ECU go wonky too.

Originally Posted by SentraSE-R View Post
The state of the drive cycle readiness monitor readiness flags only marks OBDII data logging status.
There is a huge assumption there, ECU software is made by humans whom can be unpredictable. If the monitor states are stored in the ECU they can be used by any program routine. I deal with invalid assumptions in software daily, I've seen different ECUs on cars do different things under the same circumstance precisely because they were developed independantly (i.e. 800+ mile drive cycle)

Originally Posted by SentraSE-R View Post
I happen to have checked my xB's absolute and relative TPS recently to compare them with my wife's car. Idle TPS remains rock-steady at 11.8. Relative TPS is always 8 lower than absolute TPS.
Yes, after not being driven for a while. You said it was sitting a while before the first test and a short drive, not saying it is the problem, but not convinced you have identified the problem correctly with such a "testing" procedure. How do you know the codes are related to key off? and what other ways might there be to kill your engine without causing a CEL (there might not be, but there are on other cars, again it comes down to different people developing the code basically).

And you still have not addressed the impact of the high speed tests being essentially the same on both tests, how much time do you spend idling? If it is very little then you don't have to worry so much about the low speed reading, which was within specifications anyway.
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