Fuel Economy

[1999SPORT]

Ok, i have just replaced the OHV 4 liter 6 cyl engine in my sport. I ran codes on the thing and it pointed out that the O2 sensors are bad. Other than that nothing came up. I notice that the engine sometimes idles rough (under 1000 rpm) and at 40 mph it vibrates. But my main concern is the 14 mpg fuel economy i am getting with this thing! Is this normal?? Or is it due to the O2 sensors not being good?????

Dan

 

[mwking]

Bad 02 sensors will definately hurt your fuel economy. The computer is not going to be getting accurate info to keep the air fuel mixture correct. If the mixture is too rich you can also end up melting down a catalytic converter and they are not cheap.

 

[Papa]

Try a search on O2 sensors, a number of things will set them off and I hear a lot of good O2 sensors get changed out. I think they cost about $85 from what I have read here.