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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 12-01-2013, 09:33 PM   #1
wpbmuscle
 
Join Date: Dec 2013
Vehicle: 1990, Ford, Mustang GT
Location: florida
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Default 1 spark plug covered in grease

Hi I just bought a 1990. I started changing the spark plugs when I noticed 1 was covered in grease on the plug and on the wire boot. What does this mean?
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Old 12-02-2013, 04:22 AM   #2
dawson1112
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Is it a white looking grease? Either way it is supposed to be there , dielectric grease , or silicon based grease to keep the plug wires from corroding.
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Old 12-02-2013, 06:29 AM   #3
wpbmuscle
 
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No its dark and its only on one cylinder
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Old 12-02-2013, 08:19 AM   #4
88 orangepeel notch
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??? That's a good one. As dawson said, it should be dielectric grease, but it's usually a somewhat clear grease, maybe just very old and dirty. And only being on one cyl. Hmmm, don't know.
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Old 12-02-2013, 08:19 AM
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