My car barely passed smog last week and the mechanic told me that my car is running rich. He suggested that I should change the O2 censor to fix the problem. Is this true? I used to get 280 - 300 miles per tank of gas, but now I am getting average of 240. What could have caused this?

Also, I did a valve adjustment last year from Acura and since then, I have driven the car for about 9k miles. As of now, it seems that my car is making a loud clicking noise from the engine. Do I need a valve adjustment again? If so, WTF Acura??

Car info: 1999 GS with 172K miles, never replaced the O2 censor before and last tuned up was two years ago.

 

wat do u mean by running rich? ahaa

 

running rich means hes burning too much and i can't really help much =X

does anyone here remember the color chart for diagnosing problems?


like black smoke = ?
blue = ?
clear/white = ?

 

ohh but how do u kno if ur running rich? if u dont get a tune when u modd ur car? oh and i have one more dumb question.. replacing old parts with new parts is rebuildin my motor? i kno i kno im a noob

 

My car is 95% stock. I guess I should just change the spark plugs with the plug wires and see what happen from there. Anyone else think I should change the O2 censor?