1987 MERCURY GRAND MARQUIS CANNOT PASS EMISSIONS TESTING

  • Tiny
  • 2CarPros-Archives
  • 1987 Mercury Marquis
  • V8
  • 2WD
  • automatic
  • 132,000 miles

1987 Mercury Grand Marquis mileage: 132,000. I cannot pass emissions testing. I first brought my car in and failed on HC and CO. About a week later I tried again burning premium fuel and after adding some emission system cleaner. I was still high on CO and HC. So then, I changed the air filter spark plugs and ignition wires. I then went back and tested again. I added some rubbing alcohol to my fuel tank to try to get it to burn a bit cleaner. My CO and HC jumped about 50% each. I do not want to sink too much money into this car. What should I do? Oxygen Sensor? Get the computer checked?

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Friday, November 19th, 2010 AT 7:13 PM

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  • Tiny
  • 2CarPros-Archives
  • Member

After reading your question and test results, we would suggest installing a new catalytic converter.

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Friday, November 19th, 2010 AT 7:15 PM

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