any smog tips for car to pass smog check?

[ryantparks]

94 Mitsubishi Diamante wont pass smog check its a DOHC v6 w/177k miles. It passed the 1st test but failed the 2nd but only by a couple of points ( I dont have the printout w/me).
I have some 110 octane fuel from 76, can this make it burn cleaner added with the gas already in the tank?
I hear to let it get really hot right before the test.
Its my moms car so Im not too familar with it. Thanks
I also changed the spark plugs just for the hell of it

[Kilrtoy]

SELL THE CAR,
it would be easier

[TheLurker]

1. Change the oil
2. Put in new plugs. (Done)
2. Make sure the engine is warmed up prior to starting the test.
3. Increasing oxygen to engine by takeing out the air filter.

[Kilrtoy]

That works on cars from the 60's

[TheLurker]

Worked for me on a 1984 Toyota 4 Runner

[Flying Tiger]

It's usually the cat converter.
If you decide to change it, call around to different muffler shops and get quotes you can hold them too.
Also, remove the O2 sensor and clean it with carb cleaner and replace it, plus new plugs ect. Very simple task.
Works on my 400,000 mile Toyota truck.

[Elk Chaser]

move to Idaho

[mickeyfinn]

Run it almost out of gas. Add a gallon of coleman fuel. Take the test, drive SLOWLY to the closest gas station and fill up. Remember the slowly part or you will burn a valve.

[Jungle Boy]

Drink lots of water and cranberry juice before you have to supply a sample. Refrane from fatty foods for a week before the test.... No, never mind,,,wrong test.

[Craig]

Don't know if it works all that well with computer cars, but when my 83 Mustang GT was having issues with the tests, we removed the air filter, popped a few vacuum lines that you couldn't see (or hear) and retarded the timing. It worked.
On a more deseperate note, years ago a friends F-100 had a dogged out 302 that was flunking big time. I don't remember what particular paramenter it was but the pass point was like 500 somethings. His truck was 5000 We stopped just short of the test station with a near empty tank, dumped in 5 gallons of alcohol we got at a race shop and went for it Still flunked but got it down to something like 800 So close. We pulled the 302 and put a 460 in it! 6 months later it was stolen and stripped, figures