Quote:
Originally Posted by dcb
except for HC, things generally got worse in the third test, after all the driving.
The reason I am interested in WHY you are getting these readings is because that has implications for what to do about it.
You assert it is the cat
It could be the ECU, the first run could be interpreted as a slightly rich mixture from what I can tell, and not the cat, i.e. a software problem.
It could be an o2 sensor.
It could be contamination from another system.
We simply don't know, not enough data or testing, why is this such a hard concept? You are claiming p&g makes long term changes to a cat, and really haven't demonstrated that except by repeated assertion. Make sense of the data first, I have posted links to numerous effects of catalytic converters under different conditions, the observed readings do not yet make sense to me.
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You overlook the obvious. Software problems, oxygen sensors, and vacuum leaks do not heal themselves. If you suspect them, you have to come up with an explanation that makes them go back to normal after a 900 mile drive.
As for the NOX, my lower grill block was still installed for the third "test," which took place on a warmer day. The third test isn't comparable to the first two, anyway.
Oil blowby? Heaven forbid! Visible pollution is an automatic fail. You can see from the smog tests that the car has <70k miles
CACivic, Yes, I'll record distances, and take pix.
__________________
Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
