Change your pre-cat O2 sensor if you don't know if it's been changed yet.. I did this for both my 3400 and my girlfriend's 2.2 Ecotec and we both had a noticeable increase in MPG without changing our driving habits. Both of our cars had over 135K miles on them and I know for a fact that mine was never replaced. I'm not sure about hers. I know people are going to say "if it aint broke don't fix it", but that doesn't always apply with electrical sensors because they can become inaccurate after so many years of usage. With O2 sensors they tend to become less responsive over time even if they don't throw a check engine/service vehicle soon light.
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Originally Posted by a.graham52
(gm did away with fuel filters in '04, check and see if your car has one).
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All Aleros use the same fuel filter despite the year/engine.