Gas Mileage Problem
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Joined: Jun 2007
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Gas Mileage Problem
My 93 F150 4X4 with 5.0 is getting very poor gas mileage (has gone from 12.5 mpg last summer to 8.5 this summer)
I have replaced all plugs, plug wires, cap and rotar with no change to the mileage. It also seems to be down on power.
Any ideas where to look next? Was thinking possible EGR valve or catylitic converter.
thanks for any help you can give me
Tim
I have replaced all plugs, plug wires, cap and rotar with no change to the mileage. It also seems to be down on power.
Any ideas where to look next? Was thinking possible EGR valve or catylitic converter.
thanks for any help you can give me
Tim
Elder User
Joined: Oct 2006
Posts: 843
Likes: 1
From: Redmond, WA
Regardless of the crappy mileage, how does the truck run?
A fouled air filter, or fuel filter can make you take a hit in the mileage department. It might not be a bad idea to check your timing as well. If you're not pinging under load currently, try advancing the timing 2-3 degrees.
There's no reason you should be getting less than 10mpgs...unless you're turning 38" tires or have a blower.
I average 16 if I'm nice to it, and can get up to 18 on the highway.
If your cat pooped on you, it should rattle inside. The "honeycomb" section shears loose from the housing and obstructs exhaust flow one of two ways...either it lodges itself sideways or rattles and bangs around. Most of the time you will see (or hear) the latter. There's not much to that device.
Good Luck!
M
A fouled air filter, or fuel filter can make you take a hit in the mileage department. It might not be a bad idea to check your timing as well. If you're not pinging under load currently, try advancing the timing 2-3 degrees.
There's no reason you should be getting less than 10mpgs...unless you're turning 38" tires or have a blower.
I average 16 if I'm nice to it, and can get up to 18 on the highway.
If your cat pooped on you, it should rattle inside. The "honeycomb" section shears loose from the housing and obstructs exhaust flow one of two ways...either it lodges itself sideways or rattles and bangs around. Most of the time you will see (or hear) the latter. There's not much to that device.
Good Luck!
M
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
[QUOTE=67bird]My 93 F150 4X4 with 5.0 is getting very poor gas mileage (has gone from 12.5 mpg last summer to 8.5 this summer){/QUOTE]
That is terrible milage. Start with the computer, if the check engine light has ever been on.. and I mean ever.. check the codes to see what it has detected. Go here to see how. http://www.fordfuelinjection.com/?p=13.
That is terrible milage. Start with the computer, if the check engine light has ever been on.. and I mean ever.. check the codes to see what it has detected. Go here to see how. http://www.fordfuelinjection.com/?p=13.
