mangorunner
New member
Failed the California smog test and re-test due to high NO reading.
On the retest I missed the mark by about 65ppm for NO. So I'm sorta close.
Vehicle background:
1997 3.4L. This is a California truck with about 390,000 miles on original engine and transmission.
Changed plugs and wires about 2000 miles ago.
After 1st failed test, I cleaned the MAF and replaced the upstream O2 sensor.
Second test got me to within 65ppm of the passing level.
Since I'm only 65ppm from passing — I'm wondering if there is anything I can tinker with or try to do that might help lower that level down just enough to allow it to pass?
Obviously I can replace the cat which is the original, but I'd be more than happy to try "alternative" methods as well! I'm not above burning sage, hitting the bong and dancing around the truck if it will somehow please the smog gods and help it pass....(it doesn't btw...found that out last week).
So anyone have any real-world facts, tricks, tips, suggestions, rumors or old wives-tales about lowering NO levels?
Find a shop that will test your car in 1st gear.
