Ive installed a new opti, harness, plugs, wires, ignition coil and O2's in the past couple of months and Ive noticed my gas mileage has dropped. Is it because I'm running more rich than I was with my older O2's? I'm positive a nice tune would fix my problem but was just curious.

thanks.

 

What did your plugs look like when you changed them? Did you have the problem of low milage before the tune up? What's your air filter look like?

 

air filter has been changed. fuel filer has been changed. plugs looked fine, i just canged them with everything else. i didnt have a low mileage problem before the new parts.

 

Look for dead cylinders maybe due to crossed wires. Check the wires again.

 

t t t

 

Did you use AC Delco O2's; some guys have problems with the Bosch O2's. What spark plugs did you install and what did you set the gap to?

 

tr55 plugs gapped .050 with ac delco parts from dal.

 

I agree with the about post , I believe that my bosh O2's are the fault of me richness i have a tune and i only gett 14 mpg. I really dont know what else to blame