Question about 1990 Ford F150

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What is the spark plug gap setting for a Ford F150 302 V8. Thanks as ever larryjar larryjar@northerntel.net

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It should be .054 however You should always use the sticker under the hood of your vehicle. If for some reason your says .052-.056, then that is what you use. The stickers on the truck will have the most specific info for that truck of anything. I need the year to be more sure, also when you buy the plugs, the parts store can tell you the exact gap.

Posted on Jun 14, 2009

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The correct gap range, according to the sticker under the hood of the truck, for a 1990 Ford F-150 5.0 is .042-.046.

Posted on Oct 18, 2012

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  • Al Swilling Oct 19, 2012

    Right you are. Joel Mitchell was going by AutoZone's database or by the data found in parts look-up books such as the one found in Walmart's Automotive section, which list the gap as .054. I tried setting the gap on my 1990 F-150's 5.0 liter engine, and all but two of the plugs fouled within two weeks. I changed plugs and set them at .044, and they ran fine, and there was no fouling. On my vehicle the sticker under the hood is missing. I did find a photo of the sticker online, though; and you're correct.

  • Al Swilling Oct 19, 2012

    Thanks, middleagedro, for your post.

  • middleagedro
    middleagedro Oct 18, 2014

    My experience is that the truck runs best at .044. These rigs tend to spark hot anyway.

  • middleagedro
    middleagedro Oct 18, 2014

    And, incidentally, I own a 1991 F-150 302 EFI, but the 1990 should be the same.

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SPARK PLUG GAP 1990 Ford Truck F150 1/2 ton P/U 2WD 5.0L FI 8cyl The Spark Plug Gap .054 (In thousandths of an inch)

Caution! Gap is not adjustable on certain plug brands

Posted on Jun 14, 2009

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I realize that this reply comes almost three years after the fact, but for future reference, the spark plug gap for the 302 (5.0 liter) V8 engine in Ford F150 pickups, according to Haynes Repair Manual for 1980-1994 Ford Pick-ups and Bronco, is .044. Gapping the plugs to .054, as Joshua stated, could result in unstable behavior and premature fouling.

Posted on Feb 21, 2012

  • Al Swilling Oct 19, 2012

    You're correct, but AutoZone's data base and the look-up book at DIY places like Walmart list the correct gap as being .054. I tried the .054 setting, and after a week or so, all but two of the plugs fouled. I changed plugs and gapped them at .044 (midway between .042 and .046), and they ran great, with no fouling. The data that AutoZone is wrong. If the sticker is missing from the truck, then the owner is given wrong info at AutoZone and the part look-up book at DIY outlets. Haynes Ford Pick-ups & Bronco 1980-1996 repair manual lists the gap for all engines as .044.

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