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Failed CA smog due to High HC 900 1994

posted by  U.S. Diver on  Sun May 17 10:38 CST 2020
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1994 Volvo 940, well maintained, but sits a lot. I only drive it maybe every two weeks. It runs well. Anyway I drove it a 100 miles the day before smog check, but only maybe 20 minutes on day of smog check, which I failed due to High HC.

Spark plugs have 15000 miles of service on them. Cat is original.

So after the failure, the smog guy said to drive the car maybe a 100 miles over a week and then come back. Any thoughts on this advice? Or is it adequate to really ring it out just prior to the test?

Any thoughts on fuel additives, premium gas before the test?

Thanks.






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