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Discussion Starter #1
i have a 96 deville and it is not getting good gas mileage, im getting about 16-18 around town, it has 145000 miles on it, not sure if the plugs or wires have ever been changed, i have a new k&n air filter on it, didnt seem to help any, should i change the plugs n wires n hope to get better gas mileage, or what can i do to get better gas mileage?
 

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White Diamond '03 DHS (with DTS floor shift)
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Check your FPR. That is a comon cause of poor milage. Plugs and wires are more likely to cause a misfire if bad. That said, at 145K it may be time.

Put the paper filter back on. It will filter more dirt.
 

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1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
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16-18 isn't too bad actually, for a 2 ton car that has in the neighborhood of 300hp. Keep your foot out of it.
 

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Discussion Starter #6
i didnt check it yet, but i called the dealer today and they said that i had a a recall on the fuel rail, i have to go in there tomorrow mornin to have them change it, does anyone know if they replace the fpr too? :confused:
 

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You probably will need new plug wires after they do the recall service. My 1996 had 60K when they did the service and it came out with a low rpm miss. New plug wires fixed it. I have seen at least on other post with the same problem.
 

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White Diamond '03 DHS (with DTS floor shift)
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A misfire because of failed wires is VERY common. Been there, done that.
 

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White Diamond '03 DHS (with DTS floor shift)
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I was refering to after the fuel rail recall. Be prepared for it.
 
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