8-10 mpg in 7.3 powerstroke??? Ideas of possible issues? - Ford Powerstroke Diesel Forum
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Old 04-17-2013, 01:46 PM
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Cool 8-10 mpg in 7.3 powerstroke??? Ideas of possible issues?

I just bought a 2000 f350 with 275k mi,crew cab sb 4x4. Did a full tune up, changed all the fluids to synthetic, new turbo up pipes, new tranny cooler, complete 4" exhaust, dp 3 stage tuner, stock, tow haul, and economy. Compression tested all injectors and im still getting8-9 mpg. Put 6" lift with 35" tires and it increased to 10 mpg. What could e causing this? Sensor? Exhaust waste gate sticking? Looking for ideas...
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Old 04-17-2013, 01:47 PM
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so you have 35in tires and 10mpg...lol that aint that bad.
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Old 04-17-2013, 02:02 PM
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I'm assuming it had stock wheels/tires when you got it? Something is off somewhere I get 12-13 in town, 17-18 on the highway. See my signature for the truck I drive.

Check or change the fuel filter? Intake?
You could be having an issue with the EBPV (Exhaust Back Pressure Valve). It's in the turbo base. If it is sticking shut, could be restricting exhaust flow. There is also the EBP tube up front. There's a sensor right behind the fan at the base of the HPOP. From it is a tube that runs over to the passenger side exhaust manifold. It's been said if it is plugged, it can affect mileage.
Check out this thread regarding cleaning the tube:
How to: Clean EBPS to gain lost MPGs (Video)

Just curious, what part of NorCal do you live in?
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Old 04-17-2013, 02:39 PM
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I always add a little cetane booster and it gives me a extra mile or two, always makes me feel better, lol
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Old 04-17-2013, 03:13 PM
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Mile a two with extra cetane? Hmmm

Anyway, could be low fuel pressure, low ICP, worn injectors, bad MAP/BARO/EBP sensors, boost leaks. If you have a service bed, that's a lot of weight. Hwy/city driving. Accelerating hard. Blowing black smoke. Running way over 2k RPMs. Towing all the time. Just a few. You're hand calculating mileage right?
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Old 04-17-2013, 10:11 PM
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Ok, has brand new fuel filter, and aftermarket air. Exhaust wastegate at turbo seems to be working. I was told if its not opening it whistles a bit. Mine is quiet. Ill have to check the tue that can clog and that sensor tomorrow. Also noticed tonight that in park and truck is running my rpm jumps a bit... Between 500-1500. This another issue? Possibly connected? And when i got the truck yes it was stock. Lift has not made milage worse. And i live in napa.
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Old 04-17-2013, 10:15 PM
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Quote:
Originally Posted by jesilvas View Post
Mile a two with extra cetane? Hmmm

Anyway, could be low fuel pressure, low ICP, worn injectors, bad MAP/BARO/EBP sensors, boost leaks. If you have a service bed, that's a lot of weight. Hwy/city driving. Accelerating hard. Blowing black smoke. Running way over 2k RPMs. Towing all the time. Just a few. You're hand calculating mileage right?
Injectors were tested and are supposedly working fine. No service bed and yes i tow but fuel milage drops to 8 towing...another thing- this truck has absolutely no black smoke . No smoke at all thats visible. Not even right when u start it. Is that odd? I also baby it when i drive.
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Old 04-17-2013, 11:41 PM
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Couldn't be that it is an 8,000 truck with oversized tires and lifted with the aerodynamics of brick? Is the speedo calibrated for 35s?
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Old 04-18-2013, 03:32 AM
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If your RPMs jump between 500 and 1500 that's a pretty big issue.
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Old 04-18-2013, 05:41 AM
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My brother had the exact same truck and got 28-32 in it with a 10 inch lift and 37's. theres a mechanical issue going on... Just need to find it. What would cause rmps to jump like that? Maybe connected to fuel issue?
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7.3, bad fuel economy, chip, lifted crew cab, powerstroke 7.3

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