Effin 1990 Ford F250. 460 motor

[montesa]

So this thing has always ran rich. RICH. It has also started and ran just fine…… besides the fact that runs RICH. Until Tuesday night. I started it to back out of the shed it is in. Ran awful. Like it was missing on half or more the cylinders. I figured it was cold. The pickup dies. Now it will cycle. Like it wants to start, but not start. If it starts it runs for a few seconds then bogs down and dies. Like it is flooding. The plugs are fouled. I need to replace those. Is there anything else I need to check while I am at it?

I hate this effin thing! I am also wanting to swap it to a carb to eliminate the EFI and running rich issue. Has anyone ever done that? Whats involved?

Thanks.

I've researched the carb swap a lot and decided it's not a good solution for when unable to make the efi work. You can get it figured out! There's only a handful of components that make it run.

 

[montesa]

I'm going through it too with a 1990 f150 no spark. Looking for a mobile mechanic that I can talk to and see if he really knows his stuff. Otherwise I'll keep chugging along. You get smarter every time you dig in.

 

[swampratt]

If you get a distributor that you can play with advance curves and get a carb you can make a quick timing curve and tweak that carb and get really good MPG.
99% of the time I filled up my carbed 306" ford engine in my 6000 lb 1984 ford full size van I got either 16.7 or 17.6 MPG not using any overdrive but the trans was an overdrive AOD and 3.55 gears.

I built it expecting 20+ MPG but that little engine was down on compression with the smogger 1982 heads.
Really wish I had some old small chamber 289 heads to stick on it when I built it.

Pulling trailers or one of my boats or empty it got better mpg than my buddies 2012 5.3 chevy truck and better than my boys 2013 truck with the same engine.

If you are getting 12 MPG from that 460 with the fuel injection I would be tempted to keep it.
12 is what I got from a 454" I tweaked in a 1 ton dually Chevy with granny 4 speed and 4.11 gears.

My 1980 400" ford 3/4 ton truck I could only get to 12.5 MPG but I ran a 500" 2 barrel Holley on it.
Pretty big primaries on that one.
Those 34" tall mud and snow tires do not help matters either.

 

[dlbleak]

Rotating mass is a huge drain on power and mileage. I went from 265’s to 285’s and lost 1.5 mpg.
I was only getting 15.5 with a 5.3. Went to 14.1. Decided to use up the tires that cost a $1000.
Get the big tires off and mileage will go up a bunch.

 

[swampratt]

Rotating mass is a huge drain on power and mileage. I went from 265’s to 285’s and lost 1.5 mpg.
I was only getting 15.5 with a 5.3. Went to 14.1. Decided to use up the tires that cost a $1000.
Get the big tires off and mileage will go up a bunch.

Buddy let me build and tune a 78 Nova for him (mine now) he put some drag radials on it same diameter as the 235-75-15 tires but these drag radials were almost 10 lbs heavier each.

You could feel the drain on the car after the tire swap.
This was not a putz car either just a good quick daily driver that cut 1.6 60 foot times at the track and ran 11.9 at 115 mph on 91 octane.