99-2003 engine differences.
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Tuned
Joined: Mar 2005
Posts: 479
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From: Mesa AZ
99-2003 engine differences.
Gentlemen/ ladies, I recently acquired a free 99 expo with the 5.4 2v. I have a 2003 with the 5.4 2v and am contemplating saving this motor. If I can verify it will be a direct fit, I am going to freshen it up on the stand and stab it into my 03. Visually the transmission pan looks different than the on in my 03, but everything else appears to be the same. Is there anything I am missing? Any info would be much appreciated.
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
The trans between both of them is different, but the engine is EXACTLY the same, except for the intake manifold/throttle body I think. I used a 1998 motor in my 2003 and it swapped just fine.
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
Gentlemen/ ladies, I recently acquired a free 99 expo with the 5.4 2v. I have a 2003 with the 5.4 2v and am contemplating saving this motor. If I can verify it will be a direct fit, I am going to freshen it up on the stand and stab it into my 03. Visually the transmission pan looks different than the on in my 03, but everything else appears to be the same. Is there anything I am missing? Any info would be much appreciated.
Senior User
Joined: Dec 2017
Posts: 116
Likes: 4
From: Regina, Sask
Isn’t this a change over year, I think it was 2000-2001 when they changed the heads to the PI design, and HP increased? I remember looking at an 03 engine to put into my 98 expedition, but ended up staying with the 97-99 engine so I didn’t have any drivability concerns with the stock ecm. I could be wrong, but I know there is a difference between early and later 4.6/5.4 2v engines.
Cross-Country
Joined: Dec 2019
Posts: 75
Likes: 1
From: Spokane
1999 was the change over year to PI heads for expeditions,for f150's I think it was hit or miss some were early style heads some were PI.Don't be fooled by an aluminum intake either,99 was a 1 year only aluminum PI intake for expeditions 2000 on were plastic.While there may be some minor differences such as EGR there is nothing insurmountable.You can plug off and delete the EGR if your 2003 doesn't use it as long as you use the non EGR ECM.Also there may be some minor differences in the EGR routing which can be made to work by using the matching exhaust manifolds.Also introduction of the PI heads did not introduce the higher thread count there are 4 thread PI heads and 8 thread PI heads but I'm not sure when that changeover happened.Oops my bad didn't see that the last poster stated it happened in 03.
Cross-Country
Joined: Dec 2019
Posts: 75
Likes: 1
From: Spokane
Isn’t this a change over year, I think it was 2000-2001 when they changed the heads to the PI design, and HP increased? I remember looking at an 03 engine to put into my 98 expedition, but ended up staying with the 97-99 engine so I didn’t have any drivability concerns with the stock ecm. I could be wrong, but I know there is a difference between early and later 4.6/5.4 2v engines.
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