My truck is A fuel sucking beast! (Trouble codes 62 and 67)

[Gas Sucker]

Trouble codes 62 and 67

I was hoping to get a little help here, I have a '92 F250-460-auto, mild lift and 33's. I just bought this one a few months ago and I only get 6mpg, and I don't allow my rpm's to pass 2k. I realize that 460 stands for "really bad gas mileage" but I have only had 460's for the past years and I usually get at least ten- even when I'm heavy foot. I have replaced the plugs, the truck can spin the tires from a stand still, but I think it might be lacking at higher speed but I'm not sure if that's just the automatic vs. manual (this is my first-and last automatic) -Any Ideas???

 

[Skandocious]

No doubt that the 460 is thirsty but 6mpg is pretty nasty, even with 33s.

You said you did plugs. Did you replace wires, dist cap/rotor, fuel filter? Might also do well to run some injector cleaner through, and change the o2 sensors if they're old. A bad o2 sensor can yield some nasty gas mileage. Pull the codes and see if the computer has registered anything, even if you haven't had a check engine light it could have codes stored.

 

[tomtoc]

yea, 6 is pretty low. are you towing? how much?

unloaded you should be getting 10+. 12 or 13 is about the max

 

[Brian_B]

What sort of gears are in the rear axle?

If you have some super low gears, that could be a big part of the issue.

 

[tomtoc]

I don't allow my rpm's to pass 2k

I think it might be lacking at higher speed

What sort of gears are in the rear axle?
If you have some super low gears, that could be a big part of the issue.

that could make sense. by "lacking at higher speed" do you mean:
-i can't go faster than 65 without the engine screaming
or
-i have no power on the highway

either of the above with a crazy high or crazy low gear ratio could cause bad mpgs

as a reference, i had a 97 f250 2x4 supercab that at 2k rpm on the highway, i'd be at 65mph. that's put me at about 11.5 mpg.

 

[Skandocious]

He'd have to be running some super nasty aftermarket gears to be getting mileage like that. Even with my 4.10s I run around 2000rpms at 65mph on the freeway. Ain't no way he should be getting 6mpg from something like that.

 

[CaFordDude]

WELCOME TO THE SITE Gas Sucker. Hopefully you will find the answers youare looking for and decide to stick around...

 

[Gas Sucker]

much help

Thanks for your help so far. To answer most of your questions- As far as I know the gears are stock, By "lacking" I mean that I hit 75mph at about 3k rpm's and cant push the truck faster wheather I am empty or towing, unless I get a down hill. I do tow often (3K-5K lbs)and my mileage is about 5.5mpg.

 

[Gas Sucker]

Thanks for your help so far. To answer most of your questions- As far as I know the gears are stock, By "lacking" I mean that I hit 75mph at about 3k rpm's and cant push the truck faster wheather I am empty or towing, unless I get a down hill. I do tow often (3K-5K lbs)and my mileage is about 5.5mpg.

I meant 5.5 when towing vs the 6 when empty

 

[Skandocious]

Does the truck ping at all? When's the last time you checked the timing?

Like I said before... I think the very first thing you should do is pull the codes.

 

[tomtoc]

your speed/rpms is partially to blame, but you still have something else going on.

75mph in mine would put me in the single digits pretty easily. (9 ish).
i could see a lift, 4x4, towing, etc bring it down even more

 

[Gas Sucker]

Does the truck ping at all? When's the last time you checked the timing?

Like I said before... I think the very first thing you should do is pull the codes.

I will pull the codes after work. I have also thought timing or fuel pressure regulator. No pinging, no sputtering, no rough ilding ect.

 

[Skandocious]

Tom's right about the speed... If you wanna gain some immediate MPGs, I'd pull your speed back a bit. There's a pretty drastic decline in mpg's for me after I pass around 65-70mph.

 

[Gas Sucker]

your speed/rpms is partially to blame, but you still have something else going on.

75mph in mine would put me in the single digits pretty easily. (9 ish).
i could see a lift, 4x4, towing, etc bring it down even more

I appologize for being misleading, I am hardly ever on the freeway, and do stay at slower speeds, but the few times I have tried to go faster I can't do much past 75, I was just giving an example of "lacking"

 

[Skandocious]

Ahh okay nevermind.

Then revert to my previous suggestions

 

[F 150Cobra]

chek your fuel pressure regulator.. i was getting 6 to 8 mpgs before i replace mine.. ohh and mine is a 351

 

[Skandocious]

Oo that reminds me Jurgen--

Gas Sucker-- You might also want to put a fuel pressure gauge on the rail and see what kind of fuel pressure you're getting

 

[Gas Sucker]

Oo that reminds me Jurgen--

Gas Sucker-- You might also want to put a fuel pressure gauge on the rail and see what kind of fuel pressure you're getting

What am I supposed to be at? I haven't bought a manual yet

 

[Gas Sucker]

What am I supposed to be at? I haven't bought a manual yet

I am guessing between 6 and 10 lbs

 

[Skandocious]

I'm seeing 35-45psi in my repair manual for a '92 460.