Quote:
Originally Posted by banandana
PS california allows +/- 3 degrees of ignition timing from factory spec or you will fail smog.
I've heard adjusting the idle to just below 1000rpm will help in some cases with emissions when testing. Something around 1100 is the limit afaik
Check the ECU diagnostics mode to see if the o2 sensor is reading rich or lean; it'll tell you if the ECU is trying to trim fuel up or down. Replace the o2 sensor if it's old. Check for unmetered air.
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TBH, the O2 sensor won't tell you much unless you're looking at a oscilloscope. Gotta see it in the graph to really get a decent understanding of what's going on, otherwise it's just a bunch of meaningless flashes on the dash