Engine Performance problem
1995 Chevy Astro 6 cyl Two Wheel Drive Automatic 183000 miles
i have a 95 chevy astro van I went to get emissions done and failed just on the low hc. The llimit was 220 and I had 454. I just a complete tune up from my mechanic in 09/09/08 so almost 2 years ago. Because it failed the emissions test then too. He checked for codes, no codes, replaced the oxygen sensor replaced the + and - battery cables a/c delco platinum spark plugs, air filter, fuel filter, pcv valve ignition rotor, distributer cap, and spark plug wire set. What could be making me fail the low hc and pass everything else? My readings werehigh hc 75, low co.56 high co.92 low co+co2 12.53 high 13.76
rpm reading low597 high 2530. I looked at my air filter it is a little dirty but not bad. I also had a check engine light come on and go away for about 3 months it would come on while on the highway about 15 minutes into the drive nothing felt wrong with the car, but when I shut the car off it went away and didn't come on again when I started it. It hasn't come on for about a month and a half.
Friday, September 17th, 2010 AT 8:01 AM