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2005 F150 5.4 spark plug troubles....

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Old 11-02-2010, 10:33 PM   #1
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Default 2005 F150 5.4 spark plug troubles....

I just bought a 2005 Lariat 5.4 with 190,000kms and it has pushed the spark plug out of the #4 cylinder twice in the last 2 weeks, the shop said the threads aren't stripped and they switched plugs so it isnt the spark plug either.
Any ideas what might be going on? Maybe the mechanic isnt tightening the spark plug up tight enough or would there be any other reasons that might be happening?
Any help would be great...
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Old 11-03-2010, 10:57 AM   #2
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Is he antisiezing the threads? Are they tourqueing down the plugs to the correct spec?
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Old 11-03-2010, 12:20 PM   #3
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Make sure they are not Autolite HT 15 plugs, I and many others have had lots of trouble with them.
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Old 11-03-2010, 12:27 PM   #4
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Why would it be only 1 plug ???
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Old 11-03-2010, 12:33 PM   #5
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why would it be just 1 plug causing problems....
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Old 11-04-2010, 11:13 PM   #6
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Originally Posted by GATORB8 View Post
Is he antisiezing the threads? Are they tourqueing down the plugs to the correct spec?
not sure about the torque, what is the required torque? and they are the motocraft OEM replacement plugs that are in there
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Old 11-04-2010, 11:14 PM   #7
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The check engine light has come on twice for #4 cylinder missfire.
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Old 11-06-2010, 02:08 PM   #8
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not sure about the torque, what is the required torque? and they are the motocraft OEM replacement plugs that are in there
I show 34 Nm (25 ft-lb)
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