2023 7.3L
Lead Driver
Joined: Feb 2005
Posts: 7,942
Likes: 2,652
From: The Great State of Texas
My 05 5.4 3v had almost 160k miles on it when I sold it and the cam phaser were making noise for at least 50k of those miles. I'm getting better mileage in my DRW 7.3 with 4.30 gears than I did with that 5.4 in a 7500lb crew cab F350 SRW. I just hit 16.1 on my trip over 100 miles which has been off by .5/mpg at most. My 5.4 consistently got 15mpg summer on the highway and 11-12 in the winter.
Lead Driver
Joined: Feb 2005
Posts: 7,942
Likes: 2,652
From: The Great State of Texas
My wife has a 2014 Edge Sport 3.7L and it only see's Shell, Exxon, Chevron gas (Top Tier) and run's like a top. Never even ran an injector cleaner through it.
Cross-Country
Joined: Aug 2022
Posts: 75
Likes: 25
Direct injection has a much greater cooling effect on the cylinder walls and piston than port injection, due to the fuel being sprayed directly on them, so they can use higher compression ratios with the same octane fuel without risk of detonation. It's one of the benefits of direct injection over port injection. Not saying it's overall better, but it's just one instance where port injection is inferior.
Cross-Country
Joined: Sep 2016
Posts: 62
Likes: 112
Never been a fan of the 5.4 with it's long stroke and small bore. I had a '98 F150 4x4 Super Cab and it was decent unloaded but hook up my 21ft boat and that thing would fall flat on it's face in OD or couldn't pass a gas station if you ran it in 3rd gear. Obviously it would have benefited from a 10 speed transmission. Reliability was excellent since it was the 2V version.
Logistics Pro
Joined: May 2022
Posts: 4,285
Likes: 2,416
From: Everywhere and nowhere
Never been a fan of the 5.4 with it's long stroke and small bore. I had a '98 F150 4x4 Super Cab and it was decent unloaded but hook up my 21ft boat and that thing would fall flat on it's face in OD or couldn't pass a gas station if you ran it in 3rd gear. Obviously it would have benefited from a 10 speed transmission. Reliability was excellent since it was the 2V version.
Lead Driver
Joined: Feb 2005
Posts: 7,942
Likes: 2,652
From: The Great State of Texas
I worked with a guy who had a 5.4 3v in an F150 around the same era as my super duty and he got 17mpg on the highway when I would get 13. I think they were great engines in delivery vans and smaller trucks but they did not even compare to the 6.2L for smallest engine in a 3/4-ton & up. My 5r110 was shifting all the time when empty.
When I purchased a new Super Duty in '05, I test drove one with the 5.4 3V because I wasn't sure I wanted to pay that extra $$$$ for the diesel option. Needless to say there was a reason you could hardly find a 5.4 in a Super Duty and I learned that during that test drive although the price was attractive.
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countrysF250
1999 - 2003 7.3L Power Stroke Diesel
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Feb 5, 2005 08:54 PM
