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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 03-08-2011
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Ok so my 04 4.0 is getting 14 mpg about 250 miles on a tank... it has 101,500 miles with original plugs. I have a feeling that once i change them ill see an improvement. Was also thinkin about synthetic in the transfer case and rear diff. any other ideas?? electric fan or anything else?
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Old 03-08-2011
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I changed my plugs and wires, replaced the front and rear diffs with synthetic oils, changed tranny oil. My mileage stayed the same. I'm going to guess your lift and bigger tires are more in the way of your mileage then anything
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Old 03-08-2011
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Its also winter. That will play a part in it.
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Old 03-08-2011
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Clean your MAF and IAC. Change your fuel filter and your air filter. Maybe a new PCV.
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Old 03-08-2011
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has a new fuel filter... air filter was recently cleaned. yeah 33" tires and the added weight of the bumper and winch probably arent helping. its just my dd and i drive 70 miles everyday, its killin me. cant get a car b/c its not paid off yet.
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Old 03-08-2011
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Ok so my 04 4.0 is getting 14 mpg about 250 miles on a tank... it has 101,500 miles with original plugs. I have a feeling that once i change them ill see an improvement. Was also thinkin about synthetic in the transfer case and rear diff. any other ideas?? electric fan or anything else?
Lol, I get 14-15 on 265's, well at least in town which is where I do most of my driving.

At 105K, I changed plugs, wires, cleaned IAC, replaced PCV, tranny fluid, fuel filter, and engine oil. And I am still getting the same MPGs.

I am going to replace the front pinion seal this weekend, then change the both front and rear diffs with synthetic oil. I am not crossing my fingers that this will help the MPGs.

Last edited by Jelly's Ford; 03-08-2011 at 08:17 PM.
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Old 03-08-2011
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I get about 15mpg at the worst conditions, pulling a trailer in winter. Summer I never drop below 18.5mpg...never. That's with 31" BFG AT's aired to 45psi and 4.10 gears. I removed the spare tire to save weight. If I take a long trip I take out my toolbox and remove tailgate, yet still haven't gotten over 21 with it. I'm considering a cheesy homemade box cover as my old truck got 22mpg with a tounue. Maybe some plywood covered with vinal or black outdoor carpet for long trips only
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Old 03-09-2011
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im getting 14 mpg on highway... everyday... all seasons. was thinkinn bout taking my gate off.
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Old 03-24-2011
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I wish i got 250 to a tank on mine. Got and 04 4.0l and get bout 230 miles to a tank no mods just run stock truck with 265 tires and a small tool box with nothing much in it.
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Old 03-28-2011
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I'm getting my plugs and wires. How was the back plug on the passenger side to get to? Any tricks? Just a swivel? Looks rough, always one on every vehicle huh? LOL. just hitting 100,000 miles. (4.0L)
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Old 03-29-2011
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I'm getting my plugs and wires. How was the back plug on the passenger side to get to? Any tricks? Just a swivel? Looks rough, always one on every vehicle huh? LOL. just hitting 100,000 miles. (4.0L)
Step one. Remove wheel.
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Step two. Remove inner fender plastic and they are right there in front of you.
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Old 03-29-2011
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There is no hope for the 4.0. Crappy milage comes stock.
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Old 03-29-2011
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Just bought an 02 3.0l 4x4. It just went over 100,000. I'm just barely getting 13mpg highway and city. It has a k&n cold air intake too. thinking of doing the above suggested 100,000 mile maintenance. Any other mechanical tips for improving mpg?
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Old 03-29-2011
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There is no hope for the 4.0. Crappy milage comes stock.
Coming from a guy with 33" tires
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Old 03-29-2011
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Coming from a guy with 33" tires
READ HATER.....STOCK. Have you checked who started this thread? Bro has 33's. Wow dude

Last edited by Timberwolf; 03-29-2011 at 04:21 PM.
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  #16  
Old 03-29-2011
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20mpg ain't bad CAPS LOCK GUY
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Old 03-29-2011
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Coming from a guy with 33" tires
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20mpg ain't bad CAPS LOCK GUY
WTF is your problem man?!
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Old 03-29-2011
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Nothing really, I don't think 20mpg stock and 14mpg lifted with larger tires is anything to complain about.
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Old 03-29-2011
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I was getting 17-18 with a leadfoot stock. With 33's I went down to 14.5. Changed my fuel filter and got 15.5. Now with UD pulleys and an exhaust, I'm getting 16ish. Could be better if I didn't do so much city driving and all the hills in San Diego county.
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