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: 1692

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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)
69 Mustang Coupe 5.0, 5 spd 9" rear(Project)
14 Kawasaki Vulcan (Wife's Toy)