Emissions test: passed! (barely)
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Elder User
Joined: Mar 2003
Posts: 788
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From: Hendersonville, TN
Emissions test: passed! (barely)
I finally ran my truck through the local emissions test again today, and finally passed it. The thing was low on CO (0.04% out of an allowable 1.2%) , but high in the Hydrocarbons. 218 out of an allowable 220 PPM. I was thinking that was usually an indication of a rich condition, which I can't EVEN imagine, as I had this thing so leaned out it would barely keep running. Could it just be a bad cat? It's the 1986 original, with 161,000 miles on it. Also, would this thing be an old pellet type? I figured that if I replace it with a free flowing one, I might be able to kill two birds with one stone: clean up and free up my exhaust at the same time.
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
Emissions test: passed! (barely)
Lean misfire will also raise HC somewhat. They didn't test for NOX? That ususally goes up when you run too lean, but the EGR will help lower it. A little oil burning (with that many miles) can also raise HC.
Jim
Jim
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