Engine problems
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New User
Joined: Oct 2010
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Engine problems
Last year i put a 351 bored 30 over in my 93 f150. the engine came out of a 92 ford van. the f150 originally had a 302 but i lifted it and wanted more power. The problem with it is that it goes through spark plugs after a few starts. The spark plugs are covered in black carbo soot im assuming. I replaced the injectors, cap and rotor, anything that i could think of.
Anyone have any ideas of whats wrong?
Anyone have any ideas of whats wrong?
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
Pull computer codes and go from there.
NVM
I re-read it, you're running a .030 over 351 on a stock 5.0 computer? That's no bueno, not gonna be 100%. Also your old motor probably had non-ho old 302 firing order, and your new one is 5.0HO/351 firing order. Are your plug wires in the right order?
NVM
I re-read it, you're running a .030 over 351 on a stock 5.0 computer? That's no bueno, not gonna be 100%. Also your old motor probably had non-ho old 302 firing order, and your new one is 5.0HO/351 firing order. Are your plug wires in the right order?
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i replaced the computer. i got one for a 351 and i used the firing order from the old engine. it doesnt act like it is missing, it acts a little doggy when its cold but other than that it doesnt run bad
Lead Driver
Joined: May 2009
Posts: 6,804
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From: Tobyhanma, PA
The 302 and the 351 has different firing orders. The HO 302 has the 351 order IIRC.
Fleet Mechanic
Joined: Jun 2011
Posts: 1,324
Likes: 3
From: Conway, South Carolina
You have to use the 351w firing order, of course if you didn't, I don't believe it would run at all.
Is it flooding when you try to start it? or starts fine just running rich?
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
This thread needs one of these!
