2003 - 4.0L Spark Plugs/Wires Question - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-25-2010
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2003 - 4.0L Spark Plugs/Wires Question

Okay so there a bunch of different routes to take when buying Wire & Plugs. The truck definitely needs new plugs/wires because it has a slight hestitation when it takes off and slows down at times. Should I spend the 95+ dollars on plugs/ wires or should I be more modest with my purchase on these? I know at some point I am just paying for a brand name but I want quality and dont mind paying a little but should I really go top shelf here? I went on Napas website for this
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Old 10-25-2010
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I would just get a good 8-8.8mm wire and call it good. Check your plugs and the gap while you are at it.
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Old 10-25-2010
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Originally Posted by Spartan View Post
I would just get a good 8-8.8mm wire and call it good. Check your plugs and the gap while you are at it.
no offense or anything but that doesn't really do anything for me. I'm pretty sure that these plugs and wires have been on the truck for maybe 40k miles or so and like i said there is slight hesitation when the truck takes off and sometimes when it slows down. Can anybody out there recommend a certain brand of wires/plugs to install?
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Old 10-25-2010
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I just got STI wires and Denso Iridium plugs for mine. Now I'm gonna get a SD coil and a tuner. I'm waiting till my truck gets closer to 70-80k miles. They say the 4.0 SOHC runs best on motorcraft parts.
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Old 10-26-2010
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yup, motorcraft plugs is what i've heard and read.

summit has wires MSD Ignition 31259 - MSD 8.5mm Super Conductor Spark Plug Wire Sets - Overview - SummitRacing.com

plugs are here Motorcraft SP432 - Motorcraft Platinum Spark Plugs - Overview - SummitRacing.com
i was unable to find them on the napa site.
so wires plus plugs come in at $ 80+ tax/shipping.
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Old 10-26-2010
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Originally Posted by Ford04Ranger4.0 View Post
I just got STI wires and Denso Iridium plugs for mine. Now I'm gonna get a SD coil and a tuner. I'm waiting till my truck gets closer to 70-80k miles. They say the 4.0 SOHC runs best on motorcraft parts.

I have 94k miles on the 03' Ranger. I dont mind spending a little more to get the good products....Who is they? Ford? Now when you say I tuner, do you know anything about about removing the rev limiter so the truck can go over 90 mph?
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Old 10-26-2010
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They are people on RF. Tuner idk how to sum it up, use the search button.
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Old 10-26-2010
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id stick with motorcraft plugs...4.0s really dont like anything else
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Old 10-26-2010
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Originally Posted by morris View Post
yup, motorcraft plugs is what i've heard and read.

summit has wires MSD Ignition 31259 - MSD 8.5mm Super Conductor Spark Plug Wire Sets - Overview - SummitRacing.com

plugs are here Motorcraft SP432 - Motorcraft Platinum Spark Plugs - Overview - SummitRacing.com
i was unable to find them on the napa site.
so wires plus plugs come in at $ 80+ tax/shipping.
thanks for the rec. on the plugs but the wires are for a 4 cylinder ranger.... thanks tho
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Old 10-26-2010
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sorry, thought i clicked 4.0L not 4banger.
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