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Old 07 Oct 2010, 12:01 pm
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Default 1990 Honda Civic will not pass emissions (high idle HC)

As the title says, I'm having a lot of trouble passing my washington state emissions test. The only issue has been with my HC count. The cruise is right at the limit (180), but the idle is at 340 with a limit of 220. Please bear with me as this is my first car and having lived in NY most of my life, I've next no experience in dealing with them.

I recently had a new muffler and center pipe put on, and right after that I went to my first test, coming in directly off the highway and my idle HC tested at 360 with a limit of 220. Since then, I replaced the spark plugs and wires, as well as the ignition coil. I poured in some of that CRC guaranteed to pass emissions into the gas tank and drove it a good 200 miles. The idle speed was adjusted too. My retest then failed at the above 340 with a limit of 220. Everything else tested fine.

Speaking to a honest mechanic, it was suggested to me that I have the oil changed and 20w put in instead of 5w along with a quart of Motor Medic. She told me that my make, model and year has the problem of burning a lot of oil, and that's definitely been the case. She said the 20w and the motor medic will have enough viscosity to allow for a better retest through less burning of the oil. If I stay in city, I've been fine, but long highway trips mean a constant monitoring of the oil level. The car also does idle rough. If I'm sitting at a stop light, I'll occasionally hear a rattling and the car will shudder.

Any sage advice before I go for a 3rd retest would be greatly appreciated. I'll be selling the car soon enough and don't want to do anything too extensive. That said, however, I am prepared to do the necessary.

Thanks so much,
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