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Smog passed. High on NOX and HC at 15mph. 700 1989

posted by  lqdslpstrm on  Sat Jun 28 12:46 CST 2003
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Fellow Volvoers,

Today my -89 760T passed CA smog with the result given below.

Is there anything that can be done about the somewhat crappy HC and NO values at 15 mph? I've been unwise enough to mess with the idle screw without really knowing what I was doing. Can this be a contributing factor?

Car starts and runs fine with a somewhat bad 17 MPH, which I blame the non-engaging overdrive for.

This is more fine tuning from my point, but any help is greatly appreciated.

Thanks!

/Magnus F.

The verdict:

HC(PPM) 15 mph: MAX: 112 -- MEASURED: 102
HC(PPM) 25 mph: MAX: 086 -- MEASURED: 055


CO (%) 15 mph: MAX: 0.72 -- MEASURED: 0.40
CO (%) 25 mph: MAX: 0.60 -- MEASURED: 0.14

NO(PPM) 15 mph: MAX: 778 -- MEASURED: 768
NO(PPM) 25 mph: MAX: 717 -- MEASURED: 250

CO2 (%) 15 mph: MEASURED: 14.5
CO2 (%) 25 mph: MEASURED: 14.7

O2 (%) 15 mph: MEASURED: 0.30
O2 (%) 25 mph: MEASURED: 0.10

15 mph = 1772 rpm
25 mph = 2117 rpm






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