5.0 Underpowered
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New User
Joined: Aug 2003
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From: Carl Junction Missouri
5.0 Underpowered
Hi Ya'll, I have a 1988 3/4 Ton 4 wheel drive. It has the 5.0 in it. I am only getting 8 Miles per gallon. Is the engine underpowered/lacking power. Is a New bigger engine the correct answer and if so which engine should i go with. I would like to keep the 5 speed that is in it. I need horsepower/tourqe/ and fuel milege. Please help me.,,,,,,,,,, tyrell brown
Senior User
Joined: Jul 2003
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From: St Croix Falls,WI
5.0 Underpowered
well depending the the axle gearing you have i'd might suggest upgrading to the 351. other wise i'd go with the straigh 6. it has the same power a 5.0 does but it would be better on gas. although i dont know if your tranny would bolt up or not. either way has its pros and cons
Freshman User
Joined: May 2003
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5.0 Underpowered
I have a 1990 F150 with the 302 EFI. I get about 7 and 1/2 miles to the gallon, however, I am pretty sure that my truck has an underlying problem. So, I don't believe that your truck is underpowered as such.
ken
ken
Senior User
Joined: Jun 2003
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From: San Jose, CA
5.0 Underpowered
I have a 1990 F-250 4x4 with the ZF-5 and 4.10 gears. i have a 351 and i get 12 mpg, so i think there is something wrong with your 302. check to see if your cat is plugged, and check your o2 sensor.
Elder User
Joined: Jun 2002
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From: CT
5.0 Underpowered
I have a 302 in a 88 F250 4x4 with the 5 speed. On the highway I get 16+ mpg at 65mph. Around town no idea.
My F350 was out of service and I used the F250 to trailer a backhoe from NY to CT and averaged 14mpg - the weight of the backhoe & trailer (no tractor just the backhoe ) was 7000lbs.
I'd think you should be able to average 15mpg when running right.
My F350 was out of service and I used the F250 to trailer a backhoe from NY to CT and averaged 14mpg - the weight of the backhoe & trailer (no tractor just the backhoe ) was 7000lbs.
I'd think you should be able to average 15mpg when running right.
Lead Driver
Joined: Sep 2002
Posts: 9,553
Likes: 2,034
From: North Texas
5.0 Underpowered
Start with a full tune up to max out what you already have...
Fuel Filter
O2 Sensor
PVC
Air Filter
Plugs
Wires
Cap
Rotor
Etc.
Inspect the catalytic converters also
How many miles are on your truck currently?
Fuel Filter
O2 Sensor
PVC
Air Filter
Plugs
Wires
Cap
Rotor
Etc.
Inspect the catalytic converters also
How many miles are on your truck currently?
