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Old 10-05-2010, 03:03 PM
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Weird dealer story & need input

Hey Guys , Let me first say great site . I would like some input on my trucks Fuel mileage that has been bugging me for over a yr . First I have a 2001 7.3 PSD Crew Cab 8ft bed completely stock . This is the back ground , about a 1.5 yrs ago my oil pump seals blew out when my wife was towing our camper (yes she is still my wife) it happened @ a street light & no other damage was done . The truck was towed to a ford dealer to be fixed while there I guess there was some kind of recall on the Crank or Cam positioning sensor not sure witch or even but it was some kind of sensor i know that much LOL . OK B4 all this I was getting 17mpg in town & around 20 to 22 on the highway @ 65 mph , ever since then I have been getting 14-15 in town & 16 on the highway . Also I went up north this past week moose hunting & putting around on the old tote roads ( I mean just above an idle ) I was getting 13.5! Does any of this make sense . I'm thinking I must of had some kind of down load or something & the stealer must have taken it off , is there anyway to tell .
I am looking into getting gauges & putting stacks on , if anybody has a down pipe & Y pipe I'm interested I'm going to do the DIY filter & foil delete this week . I've neglected my truck long enough but have always done my oil changes on time with fuel filter truck has 106,000 easy miles .
Thanks for any & all input .
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Old 10-05-2010, 03:24 PM
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fuel filter?
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Old 10-05-2010, 03:24 PM
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nevermind i just read you said you change it regularly
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Old 10-05-2010, 03:40 PM
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One of the many possible benefits of the CPS recall is lower MPG, but it's not that large of a jump.

The High Pressure Oil Pump (HPOP) is likely the one that had a leek. If the pump was replaced the dealer probably would have used a re-manufactured pump. The pump could be running lower Injection Control Pressure (ICP) than desired causing a loss of mileage.

On the possibility of a tune that was re-flashed, can you feel any difference in power when driving the truck? If there was a tune on the truck it would have caused the overhead computer (lie-o-meter) to read incorrectly giving a false impression of good mileage.

Driving at too low of speed will actually get poor mileage. The 7.3 will burn about a gallon an hour at idle. Best mileage should generally be around 50-65 MPH depending on gearing and other factors.

Do you have a printout of what was done at the dealer? Could be helpful in giving definite answers.
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Old 10-05-2010, 03:51 PM
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The power might be a little less but not much I would say less responsive seems to lag more , The pump wasn't ruined just the seals were replaced . They said it was from setting to long , we had just bought the truck about a month B4 . Is there a way to check the CPU .
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Old 10-05-2010, 03:59 PM
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If it's lagging more, you probably did have a tune in it. I don't know of any way to check the ECU for a previous program but the dealer should be able to tell you if it was re-flashed.

My best guess is that you were reading the overhead MPG figure and running a tune. 17/22 MPG is pushing it for these trucks and dosn't usually happen stock. 16-18MPG empty is normal for these trucks on the highway if you keep it under 2000RPM.
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Old 10-05-2010, 04:17 PM
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All I have is a recipe for the work & it says nothing about a reflash , just seals & recall work . If they did a diagnostic test on it , that wouldn't make them do a reflash . That is just a rumor I have heard can remember where . The avg . mpg I get are from the gallons I put in vs. mileage I drive & I do it every time I get fuel that's how I noticed the diff right off . What would be the best way to get it back wear it was mileage wise , would a muff delete help . That might be my next move , not to sure of the stacks yet , Talk me into it please LOL .
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Old 10-05-2010, 06:21 PM
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Stacks can look good from the front but as soon as you walk a few feet to either side of the truck Some people like them tho.

Intake, exhaust, gauges and a chip will help your mileage if you can keep you foot off the go pedal.
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Old 10-05-2010, 07:19 PM
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Read my sig please.

Sorry to hear your truck hasnt been up to par.
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Old 10-05-2010, 07:20 PM
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Got the gauges coming , working on intake this week , slow & steady wins the race .
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