1994 Chevy S-10 Failed smog what's wrong

1994 CHEVROLET S-10
158,000 MILES • 6 CYL • 4WD • AUTOMATIC
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DOUBLEDUBFIVETRE
  • MEMBER
  • 1 POST
My truck failed the emissions test and had high hydro carbons what could be the cause of this. Please help me out I need to fix it myself I think it's the cat because the check engine light isn't on. I just need to know what it could be before I buy parts. Thanks
Aug 23, 2010 at 1:24 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
first thing to do is if your check engine light is not on, then replace your fuel/air and oil filters and change your oil. Then drive teh vehicle on the exspressway about 10-15 miles or so. Or a road like it. Then while it is still warm, take it to get it tested and it probably will pass. If it doesn't pass then, take it to a pro so he can check as to why. If your cat was going bad the truck would probably not have any power and drive like the exaust is plugged..
Aug 24, 2010 at 11:18 AM
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