plugs and wires
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Northstar Engines and System Technical Discussion Discussion, plugs and wires in Cadillac Engine Technical Discussion; i have a 96 deville and it is not getting good gas mileage, im getting about 16-18 around town, it ...
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    plugs and wires

    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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    Re: plugs and wires

    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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    Re: plugs and wires

    how do i go about checking that? where is it located

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    Re: plugs and wires

    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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    Re: plugs and wires

    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?

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: plugs and wires

    they do not.

  9. #8
    hwelchwa is offline Cadillac Owners Member
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    Re: plugs and wires

    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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    Re: plugs and wires

    did it improve ur gas mileage?

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    Re: plugs and wires

    A misfire because of failed wires is VERY common. Been there, done that.

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    Re: plugs and wires

    i havent had a misfire yet luckily

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    Re: plugs and wires

    I was refering to after the fuel rail recall. Be prepared for it.

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    Re: plugs and wires

    yeah true im ready for it, do i have to get oem delco wires? or will some just autozone brand ones work?

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    Re: plugs and wires

    General concensus is stick with OEM.

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    Re: plugs and wires


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