View single post by Mike69

Posted: Thu Aug 1st, 2019 08:24 pm

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Mike69
Mustang Nut

Joined: Sun Oct 22nd, 2017

Location: Horsepasture, USA

Posts: 1690

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Jim, that spark plug looks exactly like the plug I pulled from # - 4 cyl in the old heads that were on my 4.0 when I had a problem with cracked heads. That plug looks like it is coolant fouled. Are you using coolant like I was, do the heads look like they are new?.

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21 Bronco Sport Big Bend (Wife's DD)
05 F150 XLT Reg Cab, 2WD, 5.4L, Auto (My DD)
00 Ranger Extd Cab 4x4 4.0 OHV, Auto
99 Explorer Sport 4x4 4.0 SOHC, Auto
69 Mustang Coupe 5.0, 5 spd 9" rear(Project)
14 Kawasaki Vulcan (Wife's Toy)