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5.4l spark plug thread size

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Old

Nov 10, 2018 | 12:59 PM

#1

gabriell12123

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Mountain Pass

Joined: Sep 2016

Posts: 229

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5.4l spark plug thread size

im trying to a compression test on my truck to figure why she’s smoking and I’m looking for the thread size so I can get the right kit. I bought one from harbor freight but the quick connectors didn’t fit the threads. Can somebody tell me the thread size so I can get a kit with the right connectors.

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Old

Nov 10, 2018 | 04:24 PM

#2

projectSHO89

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Joined: Jan 2004

Posts: 19,762

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From: St Louis

Probably M18. It would help if you explicitly identified your engine including the MODEL YEAR.

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Old

Nov 11, 2018 | 08:43 AM

#3

NoelCT

Mountain Pass

Joined: Sep 2018

Posts: 200

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From: Peoples Republic of CT

If you have plug out, measure thread diameter and use thread gage, or measure (count) thread pitch against steel rule.

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