1995 GMC Suburban Emissions Test

1995 GMC SUBURBAN
187,000 MILES • V8 • 4WD • AUTOMATIC
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ROMCJR
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  • 1 POST
I just had my truck inspected and it passed all test except high rpm hydrocarbon.Can you tell me what may cause this?Could it be as simple as a tune-up?I think the reading was 750 or so and max allowed is 300 I think.Thanks for your help.romcjr
Dec 24, 2009 at 4:48 AM
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MERLIN2021
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  • 17,250 POSTS
Oil change may help. New plugs, and bring it in for the test when fully warmed up. Dont shut it off while you wait your turn!
Dec 24, 2009 at 8:26 AM