Originally Posted by corvettecrazy
Originally Posted by LakevilleSSEi
I'd take a good look at the plugs and wires also.
they were replaced about 15,000 miles ago. So they shouldn't be too bad. I'll look over the wires and wait to pull the plugs if the O2 sensor doesn't fix the mpg drop.
I'd say the problem isn't going to be the plugs and wires...
I'll make the assumption that you have the original sensor, and they do last about 60,000 miles roughly.... But even at that point they have lost some of their signaling ability, or basicly they slow in their signaling rate, causing the engine to run richer for longer...
when you get the new sensor install, reset the PCM( dissconnect battery ) and allow the PCM to relearn... Then the next time you go on a good highway run clock the MPG'* for us... If you stay between 70-80<---- Yes inbetween this range, you should do 29-32..
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