i have a 1997 pontiac grand am gt 3.1 v-6 and i need to improve gas miledge?

  • Thread starter Thread starter Scott B
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Scott B

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i am a mechanic so i have replaced plugs coils and air filter fuel filter and still not beter im getiing bout 16 and im not hard on my car
 
have you tested your o2 sensor a sluggish o2 will kill economy in 97 a sluggish o2 will not set a code. will your o2 go above 750 milivolts?
 
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