New with issues
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New User
Joined: Jan 2011
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New with issues
Hi,
New guy here with a 1993 F150 short narrow bed. 300 six cylinder. 3:55 rear end. 2 wheel drive.
This pickup someone had transplanted a C-6 into it when the 5 speed manual went bad.
With the C-6 the engine at 70 sounded like it was wound pretty tight going down the road.
I recently built and installed an AOD behind the 6 cylinder in hopes of getting the rpms down a little and hopefully upping the fuel mileage some.
Buttttttt, the engine sounds like it cruises easily at 70 now, but my fuel mileage is about 10 mpg.
I don't have super big tires, it's not 4x4, just a run of the mill 1/2 ton 2 wheel drive.
Any ideas, or this mileage all I'm going to get?
Thanks
New guy here with a 1993 F150 short narrow bed. 300 six cylinder. 3:55 rear end. 2 wheel drive.
This pickup someone had transplanted a C-6 into it when the 5 speed manual went bad.
With the C-6 the engine at 70 sounded like it was wound pretty tight going down the road.
I recently built and installed an AOD behind the 6 cylinder in hopes of getting the rpms down a little and hopefully upping the fuel mileage some.
Buttttttt, the engine sounds like it cruises easily at 70 now, but my fuel mileage is about 10 mpg.
I don't have super big tires, it's not 4x4, just a run of the mill 1/2 ton 2 wheel drive.
Any ideas, or this mileage all I'm going to get?
Thanks
Cargo Master
Joined: Jul 2009
Posts: 2,541
Likes: 54
From: Des Moines
No you should be getting better mileage than that I would think. I've got a 5.8 V8 in my 91 F150 I get about 14-15 mpg.
The transmission isn't the only thing you should be focusing on. Were the emissions components removed? A lot of times people don't realize the drop they'll see in mpg when they remove the emissions controls.
Otherwise do you know if the engine may be in need of a tune up?
You can also try pulling diagnostic codes. In case you're not aware you do not have to have a check engine light in order for codes to be stored. Use this link to show you how to do it if you don't have a scanner. Ford Fuel Injection » How To Run a Self-Test
The transmission isn't the only thing you should be focusing on. Were the emissions components removed? A lot of times people don't realize the drop they'll see in mpg when they remove the emissions controls.
Otherwise do you know if the engine may be in need of a tune up?
You can also try pulling diagnostic codes. In case you're not aware you do not have to have a check engine light in order for codes to be stored. Use this link to show you how to do it if you don't have a scanner. Ford Fuel Injection » How To Run a Self-Test
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New User
Joined: Jan 2011
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I own a Snap On MT2500 scanner and have done some diagnostics on the truck. There are no trouble codes. The only thing I can see is the engine temp runs about 188 even running down the road.
As far as tune up, I will do that.
I also have a 1990 3/4 F250 cargo van with 302 and AOD and it will average 15 on the highway. It's like driving a billboard down the road. Even loaded pulling a trailer it will get 13 if I drive it right.
As far as tune up, I will do that.
I also have a 1990 3/4 F250 cargo van with 302 and AOD and it will average 15 on the highway. It's like driving a billboard down the road. Even loaded pulling a trailer it will get 13 if I drive it right.
Senior User
Joined: Dec 2010
Posts: 295
Likes: 1
From: Ca.
If it wasn't an automatic, then i would suggest changing out the rear end gears down to 3.25 from the stock ratio of 3.55. That's what i did.
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New User
Joined: Jan 2011
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Just a comparison my current truck (in sig.) 94 f350 460w/E40d gets about 12mpg as a mix hwy/city 40/60... You should get much better...
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From: Kentucky
That lift/body lift and big tires are huge contributors to your poor mileage problem. It is amazing how much rolling resistance those tires add as well as aero drag with the lift.
I will ask this as well, did you recalibrate the PSOM to compensate for those tall tires?
A tuneup is in order to eliminate bad plugs/wires/ect. I wonder if the cooler running temperature is keeping the PCM in open loop as well? 188 degrees should be high enough, but I would like a little warmer temperature myself.
I will ask this as well, did you recalibrate the PSOM to compensate for those tall tires?
A tuneup is in order to eliminate bad plugs/wires/ect. I wonder if the cooler running temperature is keeping the PCM in open loop as well? 188 degrees should be high enough, but I would like a little warmer temperature myself.
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New User
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I'm not sure who is responding to whom in the thread I started. But this truck does not have any lift kit, nor anything more than stock type tires. Not oversized or big tires.
I did bump the timing up a little and it does run better, and will install a new thermostat to get the temp up where it should be.
I'll see if that helps.
Thanks for the suggestions.
I did bump the timing up a little and it does run better, and will install a new thermostat to get the temp up where it should be.
I'll see if that helps.
Thanks for the suggestions.