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Horrible Gas Mileage 1988 460

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Old 08-05-2011, 12:32 PM
Ford Flatbed Ford Flatbed is offline
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Horrible Gas Mileage 1988 460

I recently purchased a 1988 Ford F350 460 manual trans truck. It was in pretty bad shape but it ran. After working out all the major issues I found that the fuel mileage was alot woarse then expected. 7MPG bad on the open road. I can live with 10-12MPG, but 7! I have no clue to why it is so bad. If anyone has any advice I would really appreciate it. One thing that is a bit wierd too, is the truck pasted smog even with this issue.

Thanks
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Old 08-05-2011, 12:36 PM
ChristopherN ChristopherN is offline
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Have you done a tune up recently?
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Old 08-05-2011, 12:59 PM
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Agreed ^^

Plugs, wires, cap & rotor, fuel and air filters all would help. Check the air pressure in your tires. Check your fuel pressure.

Also, is it 4x4? How big are the tires? What rear end gear does it have? Big tires and stock gearing will kill your MPG.
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Old 08-05-2011, 01:14 PM
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Aggreed X2^^

Also check the catalytic converter. My truck was doing about 8 mpg on the highway when it plugged up and my bosses '88 truck was getting about 4 mpg when its cat plugged up.
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Old 08-05-2011, 01:26 PM
Ford Flatbed Ford Flatbed is offline
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Yeah I went through the truck completly. It has new spark plugs, Cap, rotor, spark plug wires, air filter, fuel filter. The truck has 33's on it air pressure is at the recommend pressure on the tires. How could a guy check to see if the cat is plugged?
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Old 08-05-2011, 01:28 PM
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I am not sure what the gear ratio is. In 5th gear around 55-60 it is running around 2000 RPM. I would guess 3.55 to 3.75
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Old 08-05-2011, 01:45 PM
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I wish I could get 7 MPG, I only get about 5 MPG.

It sounds like you are staying in open loop. You might want to check the O2 sensor to get out of open loop and gets some driving in closed loop.

You could try driving it with a scanner on it to see if it ever changes to closed loop.
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Old 08-05-2011, 01:55 PM
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I got 14 hwy with a 3.55 geared ccswb 460. No cat, K&N filter, and E3 plugs. Got 7 b4.
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Old 09-14-2012, 09:15 PM
Courtney Carver Courtney Carver is offline
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Quote:
Originally Posted by 1800joedaddy View Post
I got 14 hwy with a 3.55 geared ccswb 460. No cat, K&N filter, and E3 plugs. Got 7 b4.
i just got 1988 f350 with a 460 gas engine, will not start, someone said the injectors were not pulsating, any ideas please
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Old 09-14-2012, 11:09 PM
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I don't get it. that pretty much what that vintage truck got in the day. Maybe your askin for too much out of it.
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Old 09-14-2012, 11:13 PM
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Originally Posted by Courtney Carver View Post
i just got 1988 f350 with a 460 gas engine, will not start, someone said the injectors were not pulsating, any ideas please
Not even close to enough information to give an opinion. Can you give diagnostics. Is there spark?
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Old 09-15-2012, 07:06 AM
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Put a NOID light on one of the injector plugs and find out.
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Old 04-28-2013, 10:09 PM
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What are e3 plugs who makes them
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Old 04-29-2013, 02:52 AM
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E3 plugs are Chinese snake oil like Split Fire etc. A KN is a waste of time as well. A good tune up with quality parts and fresh fluids is what would be best. The 460 should get around 10-14 mpg in stock form.
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Old 04-29-2013, 08:30 AM
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I get about 8-10 mpg, 460, 4x4, 4.10 limited slip, K&N air filter(seemed like it made a difference all around after switching from the stock filter).
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