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Old 07-08-2013, 12:01 PM
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02 7.3 bad mpg

Hello all,

I am getting average calculated by hand 11mpg on the highway and 10mpg in town.

2002
F250
7.3
4 door
4x4
207,000 miles
4" lift
35x13x18 tires
Maybe 100lbs worth of toolbox and contents
Headache rack...not full length
Bolt on grill guard

4" mbrp turbo back
6637 filter
New ICP
Cleaned ebpv and tube
New fuel filter
AIH delete
CCV mod from riff raff
Gauges going in this week
Hutch and harpoon mod as soon as I run outa diesel
Boost anihilator from driven diesel this week
Superchips flashpaq 1855 tuner
Have IPR Rebuild kit from diesel o rings but hesitant to pull it after all the horror stories till I'm sure it's a problem.

I run all over town all week. Few miles here and a few miles there. Very rarely go over 2000rpm getting up to speed. Never let the truck run sitting more than 5 min and that only happens about once every week.

Usually on a 100-200 mile round trip every weekend. Still don't exceed 2000rpm very often getting up to highway speeds. Always set cruise. Usually at 72.

Got 7.6mpg towing 12,000lb travel trailer 200 miles this last weekend. Used the heavy tow setting on superchips. Ran about 65 mph.

Truck runs good with no leaks to speak of.

Is this kind of mpg to be expected?

Didn't change any when I lifted it and put bigger tires. Nor did it change any when i put the 6637 and bigger exhaust. Been calculating it by hand every tank in the year I've owned it.

Any help will be greatly appreciated.

Thanks,

Jmiller
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Old 07-08-2013, 12:15 PM
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look for soot on the firewall behind the turbo and build yourself a boost leak detector. You'd be surprise what a little bit of exhaust leak or boost leak, will do to these rigs. I'd dump the superchips for now and see what you get. The weight you tow, doesnt call for tunes, i'd think.
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Old 07-08-2013, 12:49 PM
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Quote:
Originally Posted by timmyboy76 View Post
look for soot on the firewall behind the turbo and build yourself a boost leak detector. You'd be surprise what a little bit of exhaust leak or boost leak, will do to these rigs. I'd dump the superchips for now and see what you get. The weight you tow, doesnt call for tunes, i'd think.
What he said...
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Old 07-08-2013, 12:53 PM
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CLEAN FUEL FILTER?
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Old 07-08-2013, 01:03 PM
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Will check for boost leaks. Truck seems to have plenty of power tho.

Plan on ditching the superchips and ordering the php hydra this week.

Yes...the fuel filter I put in was brand new.

Thanks,

Jmiller
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Old 07-08-2013, 05:05 PM
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Are you correcting for the larger tires? If not, your mileage is about 10% higher than you think it is, along with your odometer and speedo. Your mileage is still low, I also have 35s on my truck and average 16.5 on long trips with the cruise set on 75 MPH (corrected).
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Old 07-08-2013, 06:00 PM
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I corrected the tire size through the superchips tuner. Speedo is within 1mph of my Tom Tom that stays mounted on the dash. Would the odometer still be correct if speedo is correct?

I did the boost leak detector and only found one minor leak...rubber boot coming out of bottom of turbo to passenger side intake. Fixed it no prob. Of course the red and green lines leaked a lil. And I could hear air thru the exhaust pipe. Checked up pipes and inter cooler pipes. No leaks.

Ordered php hydra today. I know it won't solve my issues with mpg but I will feel better about running it than the superchips.

My next step is to clean and rebuild the ipr I guess.

Anymore input on a possible culprit?

No real blow by to speak of when I remove the oil fill cap.

Thanks,

Jmiller
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Old 07-08-2013, 06:27 PM
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Did you remove the EBPS tube? It may have a rust hole in it.

Sent from AutoGuide.com Free App
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Old 07-08-2013, 06:39 PM
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I had a similar situation a while back, I got 12mpg no matter how I drove.

I changed my cps and did not see much change. Replaced my icp, ipr and ebps all at the same time iirc . I think it was the ipr or icp that really helped. The ebps was not very bad.

I ended up getting 14-15 city and 17-18 hwy@65-75. This was when I still had stock injectors and turbo with standard php tunes, and stock tires. You can also see I have a big dually with 410s

Id check the ebps and tube, icp and ipr.
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Old 07-08-2013, 06:46 PM
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Cleaned the ebpv last week. Completely removed the tube and cleaned it and checked for holes. Cleaned where it mounts to the exhaust manifold and the bracket behind the pullies. Lightly cleaned inside the sensor. Wasn't much in terms of soot to clean out.

Put new icp n last week as well. Old one had started leaking oil into the connector.

Maybe need new ebpv. Looked fine to me.

Surely my one little boost leak couldn't cause my mpg to be that bad???

One thing at a time I guess and constantly check mpg.
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