7 mpg
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Senior User
Joined: Jan 2009
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7 mpg
so i noticed that i been goin threw quite a bit of gas, so onmy last tank i did the math and it came out to 7.8 mpg!!!
i dont really no whats wrong, im goin to do the fule filter and see if that helps. any ideas? thanks. i only got 150 miles to a full tank of gas. the truck is my 88 with 2.9 in it, all tires have good air psi, and hubs are unlockes and tv is in 2wd high.
i dont really no whats wrong, im goin to do the fule filter and see if that helps. any ideas? thanks. i only got 150 miles to a full tank of gas. the truck is my 88 with 2.9 in it, all tires have good air psi, and hubs are unlockes and tv is in 2wd high.
Senior User
Joined: Dec 2005
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man something isnt right thats for sure. that 460 sounds good. my old 2.9 4x4 never got that bad of gas mileage but i would never know because back then it didnt matter. gas was only 98 cents a gallon who cared? hope you find the problem. let us know if you did.
Fleet Mechanic
Joined: Sep 2003
Posts: 1,980
Likes: 2
From: central ohio
o.k. check obvoius stuff like tire pressure, air filter, maybe a fuel filter. if the check engine light is on it may need O2 sensors, could be alot of little things, check for stored codes. might do a compression check with that many miles on it, you could have a dead or weak cylinder(s). with the auto trans theres always the posibility its not getting into high gear. lets us know what you find.
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Senior User
Joined: Oct 2004
Posts: 216
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From: Near Hemet, CA
Does that have a mechanical fuel pump? If the diaphram is leaking that might account for the bad mileage. Do you smell gasoline under the hood or anywhere?
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Fleet Mechanic
Joined: Sep 2003
Posts: 1,980
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From: central ohio
the only thing i ever drove that did that bad was a '77 F250 with the 400, full-time 4wd 4.10's and the C6 auto. and even at that it would get 8-9. theres got to be something going on, possibly many contributing issues.
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hey guys, thanks for all the repleys, i have check all the little things like tires psi if the hubs are unlocked, the truck does go into high gear there is no leak or no smell of gas, i am goin to do a fule filter this weekend i put some fule treatment in it today dont no if that helped yet. i will let you guys no how i make out. thanks again steve.
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Senior User
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the truck seems slugish all the time, when it first starts up it will run like **** and blow black smoke, i have really smelt any gas or unburnt gas but i havent been lookingfor it either, i will check tomarrow. i no that the truck needs front wheel barings really bad, would that make the trck do this bad or could it just be all the above?
Elder User
Joined: Aug 2007
Posts: 782
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From: South Carolina
the truck seems slugish all the time, when it first starts up it will run like **** and blow black smoke, i have really smelt any gas or unburnt gas but i havent been lookingfor it either, i will check tomarrow. i no that the truck needs front wheel barings really bad, would that make the trck do this bad or could it just be all the above?
Mass air flow meter is dirty. Take the intake tube apart, buy some MAF cleaner, and spray away, do not touch it with your hands or any tools, very fragile. Wheel bearings will hurt economy, but not that much. You should be getting 15-18 mpg out of that 2.9.
Lead Driver
Joined: Jul 2007
Posts: 7,868
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From: Rhode Island
an 88 is still MAP. I'm still leaning towards the fuel pressure regulator. You can test the map by unplugging the electrical connection. If the truck stops blowing black smoke and runs better then it is your MAP.