OK first of all i am seeing alot of black some and i think its my 02 sensor, but what i want to know is dose the o2 sensor just work to lean your a/f mixture out under cruising speed. Or dose it work all the time to control the a/f. even at idle, Thanks Marc

 

the 02 sensor controls cruising speeds / idle etc. If it's not functioning, expect bad gas mileage and a not so good running car.

Danny

 

well that must be my problem cause i got 10 mile to 16 gallsons, ouch. So could possible stop the rich idle? Cool thanks Rx7 elmo