View single post by Mike69

Posted: Wed May 13th, 2020 02:18 pm

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Mike69
Mustang Nut

Joined: Sun Oct 22nd, 2017

Location: Horsepasture, USA

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Jim when I had the same problem you are having it immediately sounded to me like a cracked head. I did a compression test, & it passed but yet the heads were cracked. I still think that is your problem. Just for the heck of it pull #-3 spark plug & look at it, because both of the heads on my 4.0 were cracked. Hairline crack between the valve seats.

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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)
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