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The Owner's Manual says the gap is noted on a decal in the engine compartment. I'd rely on that.

The gap is also cited in the Owners Manual as .052-.056 (around page #261)

When I finally found Motorcraft brand plugs for my 2001, there were 2 different gaps cited at the parts store. I ended up not having to change the factory gap of about .055

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My Chiltons and the spec given to me at NAPA with the plugs said 0.053-0.056" for 1998 3.8L. The Autolite Platinum 2 plugs were not sized to this either.

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Between 0.042 and 0.046 it's in the Ford Windstar manuel if you have one it's almost at the end of the book. Hope it helps!

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If you go with the bosh platinum 2 plugs you don't have to worry about the gap, they come pre gapped and work like a charm. I am really pleased with them in my 98 3.8l.

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14y ago
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Q: What is the gap on the spark plugs on a 1999 Ford Windstar?
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