Nothing's WORKING...
Thread Starter
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
Nothing's WORKING...
My truck... 1989 F250 with a 351 and a c6 tranny. It has 4.10 gears and is getting 6mpg in the city and 8 on the highway. Mileage:31,000. Everything has been maintained, you know, the usual, new plugs, dist. cap, wires, new fuel filter... Mods: K&N FIPK, cat back glass pack exhaust and 33'' tires. All the fluids are full sythetic, tranny was serviced a couple months ago, everything was fine in that area. No codes except for a 33 (EGR valve). this gas mileage sucks and i would like to know if anyone thinks they can help me on this issue. Alot of you have been giving me ideas and i really appreciate that, but nothing has worked so far 
.
Any ideas???
.Any ideas???
Senior User
Joined: Nov 2007
Posts: 275
Likes: 0
I suggested you install a new fan clutch, have you tried that yet? Here is a quick way to see if that is your problem. Just remove the fan blade from the clutch (it is held on by 4 bolts) leave the fan clutch in place tho. take it for a short ride where you don't have to worry about getting stuck in traffic (as long as you are able to maintain speed you won't over heat). If your motor sounds better and feels less strained then your fan clutch is not disengaging and that eats up fuel.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
How wide are those 33s? I think you need to check your timing chain and see if it's got some play in it. You may only have 31k miles but it's still over 20 years old. There are going to be worn out parts on it.
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
Nope. Its 31,000 original miles... and the plugs are double platnum autolites along with autolite wires.
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Thread Starter
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
I suggested you install a new fan clutch, have you tried that yet? Here is a quick way to see if that is your problem. Just remove the fan blade from the clutch (it is held on by 4 bolts) leave the fan clutch in place tho. take it for a short ride where you don't have to worry about getting stuck in traffic (as long as you are able to maintain speed you won't over heat). If your motor sounds better and feels less strained then your fan clutch is not disengaging and that eats up fuel.
Thread Starter
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
I'll check the timing chain. Thanks. does anyone think an aftermarket distributor upgrade would be a good move?
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
plats are not my pick and double plats would be double not my pic.
motorcraft copper plugs and i bet things improve.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
I have to agree on the copper plugs. You're TFI ignition system was designed for copper plugs not platinums. I ran them (plats) for about three days in a '92 E150 with a 351w. It ran like crap. I put regular motorcrafts (copper plugs) back in and it ran like new.
Thread Starter
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
lol. thanks ill do that this week and see if anything changes