88 325i, car runs rich, nox, and co2 numbers are fine. It seems like the numbers are high due to unburnt fuel.
Been working on these for a decade, know the name of every sensor, know how to test, etc...
Every time ive ever smogged a car that failed was due to high nox, and replacing the 30 year old cat always fixed the issue. Could it be the cat? Replaced AFM with a known good, o2 sensor changes voltage and within spec, no vacuum leaks, have not changed the FPR or injectors and dont suspect them. Spark plugs look fine, lots of electrode left, no carbon, normal wear. Wires have normal resistance.
Could it just be the cat? I can replace that, i just find it hard to believe it is. Low speed (15 MPH test) failed by an additional 30% higher than allowed, high speed (25 MPH test) passed barely, everything else is great and car runs great except it smells rich as hell.
Any input is appreciated.
Been working on these for a decade, know the name of every sensor, know how to test, etc...
Every time ive ever smogged a car that failed was due to high nox, and replacing the 30 year old cat always fixed the issue. Could it be the cat? Replaced AFM with a known good, o2 sensor changes voltage and within spec, no vacuum leaks, have not changed the FPR or injectors and dont suspect them. Spark plugs look fine, lots of electrode left, no carbon, normal wear. Wires have normal resistance.
Could it just be the cat? I can replace that, i just find it hard to believe it is. Low speed (15 MPH test) failed by an additional 30% higher than allowed, high speed (25 MPH test) passed barely, everything else is great and car runs great except it smells rich as hell.
Any input is appreciated.
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