1995 GMC Suburban Emissions Test

1995 GMC SUBURBAN
187,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
ROMCJR
  • MEMBER
  • 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
Advertisement
Avatar
MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
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
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.