5.4 Triton (spark plug blown out of cyl head) - F150online Forums

5.4 Triton (spark plug blown out of cyl head)

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Old 12-26-2001, 06:25 PM
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Join Date: Dec 2001
Location: North Carolina
Vehicle: 1999 Ford E350
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5.4 Triton (spark plug blown out of cyl head)

I have a 1999 E350 cube van that has blown a spark plug from the cyl head with apx 48,000 on it.

My question is, has anyone else had or know of any more concerns of this nature.

Thank you,

Terry McNeil
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Old 12-26-2001, 08:20 PM
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Join Date: Apr 2001
Location: Warner Robins, Ga, CSA
Vehicle: 2001 FORD F150
Posts: 5,939
Several Lightnings(5.4L) have had plugs that blew out. Others have found the plugs little more than finger tight.

When you go to change them, remember to not over tighten them as there are only 4 or 5 threads to hold them in the aluminum head. On the Ls, you can't get a torque wrench(13 ft. lbs.) on several plugs so NGK says to tightne them "finger-tight" and then 1/16th of a turn more--careful!

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Old 12-26-2001, 10:59 PM
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Join Date: Dec 2001
Location: central california
Vehicle: 2002 Ford F150
Posts: 254
i have seen this alot. and from what i understand. the head can not be fixed. to last any time. install new head. is the fix i have seen. alot of the early 5.4's had this concern. the newer one's are ok. not sure about the 4.6.
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Old 12-27-2001, 09:47 AM
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Join Date: Dec 2001
Location: Christiansburg, Virginia
Vehicle: 1999 Ford Expedition
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I had this happen on my expedition with 38,000 miles on it. I was at idle when it broke a chunk off the head. Like to never got it to the dealer. They were pretty amazed, they had never seen it before.
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