Guys, I have a 1995 Honda Civic and it has failed its last 3 emissions test because of high CO levels. I need tog et it under 1.07%. The first time it was at 2.8%, then 2.6%, then 2.0%. I have been going to a local shop and I trust the guy. He has replaced the O2 sensor. He also cleaned out the catalytic convertor because there was a lot of carbon build-up in it and he told me to keep filling it up with premium gas and to put in an engine cleaner when I go and fill up and then to keep driving it a lot before I get it tested again.

Now I was at Valvoline the other day getting an oil change and I asked the guy about it and he said that in Honda's over time the "idol control solenoid" goes bad and makes the engine sound like:

I had gotten an oil change at Valvoline and I asked the guy there about it and he said something about an idle control solenoid which I know nothing about. Then I heard something about a possible vacuum leak? Looking for some help in diagnosing this.

 

Putting in premium gas is a waste of your money.

Post the emissions sheets.

 

My bet is on your air filter. You do know that you should clean that thing every once in a while right?

 

Both^