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Failed emisons inspection

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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abscate
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Re: Failed emisons inspection

Post by abscate »

JRobledoVolvo940 wrote:I just failed the smog inspection in CA. 1994 940 wagon (non-turbo) w/254,000 miles. The part of the test that it failed is the NOx portion at the 15 mph speed but it passed the 25 mph. The max emissions allowed is 556 but i measured 686. The catalytic converter was just replaced 2 years ago, oil changed 2 weeks ago, plugs last done at 237,000 miles and the "check engine" light is not on.

ANY suggestions?
High NOX is probably a vacuum leak somewhere. Your 1994 doesn't have the EVAP test of the 1996 on (I think) so my guess is a vacuum hose is split, leaking, or loose somewhere
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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