4.2 help
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Freshman User
Joined: Jan 2007
Posts: 41
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From: Oswego
4.2 help
OK so 4.2 97 F150. REad in exhaustion about lower intake gasket. Story is PO had a little loss of coolant. Drove truck 20 miles, never overheated. Got home, it was missing a bit. Shut it off. Sat three months til yesterday. I pulled spark plugs. Cranked engine and oil sprayed out rear cylinders on each side. Oil has some coolant/milky residue. Does this sound like the intake gasket? Anything else I should check? As I tore it apart, I also noticed the oil mixture in the air intake tube, by the throttle body. It was also in the upper plenum runners. Thoughts? Thanks!
New User
Joined: Jul 2011
Posts: 10
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From: Terre Haute, IN
blown head gasket if there oil. The lower intake gasket needs changed anyways because that was a big flaw for that year 4.2L, I had both go bad. Are you sure it was oil comming from the rear cylinders and not coolant?
If ur seeing alot of the milky stuff then i would change the gaskets and get the heads checked out.
I had this problem as well, I spit the head between cyl 5&6, and the gasket was split as well. Needed new heads.
If ur seeing alot of the milky stuff then i would change the gaskets and get the heads checked out.
I had this problem as well, I spit the head between cyl 5&6, and the gasket was split as well. Needed new heads.
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