Failed emissions test on 1990 Chevrolet Astro

Ideal speed HC greater than 220 parts per million reading was 595 parts per million note the Van ia a 1988

by in North Las Vegas, NV on February 05, 2010
1 answer
ANSWER by , February 05, 2015
Could be a bad catalyst, bad air pump, hard to say. A worn out engine will fail too.