2002 7.3 mileage down the toilet - Ford Powerstroke Diesel Forum
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Old 07-31-2014, 10:32 PM
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2002 7.3 mileage down the toilet

So I've had my f350 4wd CC Dually since 2004 It was equipped with a Superchips Flip Chip. I ran with it at the +75hp setting most always. The truck had no other mods that I was aware of except for the waste gate vacuum line plugged off and a US electronic fan clutch setup running in the open mode. I'm not blowing smoke when I say this truck got 21 mpg city and 27 mpg hwy pulling a 4000 lb trailer from Sacramento CA to Portland Ind at 70 mph. I kept mileage records and the computer was nearly spot on every time. fast forward to 2011. the chip craps out one day and the engine sounds like its trying to hydraulic. I immediately shut the truck off and turn the chip of.f I restart and all is fine but my mileage falls off to around 14 city. I decide to flip the switch back on one day and soon afterwards it sounds like its going to hydraulic again. That's it, I disable the switch. at 110k miles. The turbo gave out at about the same time in mid 2011. I buy one of the ceramic ball bearing race turbo's and do the install. there is no bypass to the waste gate now. Motor runs good but without the fuel it might as well be stock. My mileage is now hovering at 11.4mpg city and 9.6mpg towing. I'm fed up with the mileage. What the hell is going on? Super chips no longer has the flip chip. What does anyone recommend as a good performance chip that will bring my mileage back? This is not a fire breather but a heavy tow rig that pulls my rv and 48 pace triple axle racecar trailer and every day truck. I miss the performance and mileage Help!!!
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Old 07-31-2014, 10:43 PM
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First, get yourself a new calculator. You said you checked the overhead computer's mileage but 27mpg isn't possible even empty. 27mpg is the kind of figure you will see on the computer with a chip installed but it's not real.

Next, I am assuming you are talking about the 38r turbo for your replacement. If so it's normal for the wast gate to come extremely loose. With stock injectors, just tighten the waste gate down as far as it will go and disconnect the red line again. With low boost, your mpg are suffering.

Last, invest in boost, etg, trans temp gauges and a tuner. The boost gauge will be extra helpful here so you can see the difference between stock, tuned and the 38r with it's loose waste gate. Don't go with superchips again, go with one of the well known tuners like TW, DP or PHP.
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Old 08-01-2014, 09:25 PM
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3/4- 1 ton trucks don't get 27mpg, unless ur on a cummins forum lol. So how many miles were you able to drive per tank at "27 mpg"? I'm with JR, u just weren't getting that kind of mileage.


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Old 08-02-2014, 08:54 AM
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There are a bunch of little things that can be responsible for a loss in fuel mileage.
Do a little searching on this forum and you'll see my previous answers to this same question.

There is no way a CC/dually can get the mileage numbers you're speaking of.
We are men of action, lies do not become us.
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Old 08-02-2014, 08:59 AM
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Here are my search results
http://www.powerstroke.org/forum/sea...rchid=18805578
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Old 08-02-2014, 11:10 AM
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Heck I'd be happy with 21mpg empty, but I'm not saying you are lying but those are some great mpg's number's. I had a 2000 F-250 that was getting around 15.5-16mpg empty, fast forward too my replacement 2001 F-250 CCSRW 4X4 that is getting in the low 14mpg too the high 13mpg, so I'm casing down what might be my issue, is it something in the motor or is it just because it's a 4X4 and it's heavier than my 2wd 2000 that has been totaled.

The list of stuff I've done:
Oil/filter changed
Fuel Filter (Holy Cow!! this was horrible inside)
Tranny fluid and filter
coolant flush
ICP replaced
CPS changed out
All of the intake boot's tightened up, which fixed the oil leaking into the valley.
Proper tire pressure 65lbs (front) 70lbs(back) I figure I'd run alittle more in the front than my old truck because it's a 4WD
Run some Diesel Kleen in the tank, but some have said this can help kill mileage, so I will just stick too 2 stroke oil.

Next step is the OBD torque app
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Old 08-02-2014, 09:26 PM
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i average 13-14.

my injectors are original at 245k miles but still i never dream of even seeing 20mpg even with new single shots.
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Old 08-03-2014, 02:55 AM
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Bill, have your truck diagnosed on a proper scanner from a shop that knows the 7.3 well.

Or, if you have an Android smartphone, buy the TorquePro app and the BAFX Bluetooth adapter and let's read some parameters of what's going on.

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Old 08-04-2014, 07:45 AM
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Not to hijack the thread, but I have Torque and I'm curious what parameters we'd be looking at to diagnose the MPG issue.
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Old 08-04-2014, 11:29 AM
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Well You guys don't have to believe me but the numbers never lied. Either based on the computer or actual point to point gps. The point is my mileage has been miserable ever since the flip chip failed. I want to try to get my numbers back. I don't have an android as joel suggested to download an app. thanks though

Joel I tried the archive you listed but wouldn't come up

All I know is it is always better to have the horsepower and not need it than to always be wanting for it. My 3412TTAC Cat was the same way in my log truck. Set detuned at 600hp it would get 4mpg, With the screw turned up and timing bumped at 1400hp it got 10.2mpg. Yes 1400 hp on a chassis dyno at Caterpillar when they had their power pull dyno days. I know what I know so don't tell me what you think I know. I'm looking for some serious feedback on this.

And I was getting well over 600mi to a tank load. From Sac to LA and halve way back again before needing a fill with several gallons still in the tank.
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