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Failed emissions, CO too high

Started by Draekon, August 17, 2011, 09:29:06 PM

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vangremlin

#15
October 07, 2011, 10:56:32 PM
Yep, dirty oil is can be a big factor in failing the test.  I had a relatively new car fail the test, changed the oil, no more problem.
1981 Kammback 258 - "Pepe"
1980 Coupe 258 - "Ginger
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390 - sold

shanebo

#16
October 08, 2011, 04:28:45 AM
Colorado is funny with emissions....Some counties are super strict and other counties dont even require emissions i live in El Paso county and we dont have to have emissions...thank god cuz none of my cars would pass.

The altitude can cause some problems too especially if your car is adjusted for sea level.
AMC, serving up heaping helpings of AWESOME since 1954

zboot

#17
July 22, 2020, 12:12:17 AM
To add to this, I'm in CO and had an Eagle fail emissions testing a couple years back. I tried leaning it out with various mixtures of E85 - it knocked down my CO but raised my NOx failing emissions. After several rounds of this, I found the issue - I had a hole in my exhaust pipe. After plugging with JB Weld, immediately passed on regular, no E85 needed.

Canoe

#18
July 22, 2020, 12:25:09 AM Last Edit: July 22, 2020, 12:27:42 AM by Canoe
Quote from: zboot on July 22, 2020, 12:12:17 AM... knocked down my CO but raised my NOx failing emissions. ... I had a hole in my exhaust pipe.  After plugging with JB Weld, immediately passed ...
Interesting.
Was the hole upstream of the cat?
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