Bad MPG
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Bad MPG
I have a 2000 f350 with ,Air Raid intake, Banks exhaust with exhaust brake, GTP38r, Boost fooler, AIH Delete, 6.0 trans cooler, billet converter, shift kit, DP Tuner, FRX, HPX, Isspro ev2 gauges on 35's
For the last 5 months I have been using a <acronym title="Miles Per Gallon">mpg</acronym> app to keep track of my trucks mpg The best I can get is 11.7 highway 10.4 in town and 9.5 towing. These seem very low compared to most guys.
I baby this truck and always try to keep it under 2000 rpms, any ideas what could be causing such bad mpg ?
For the last 5 months I have been using a <acronym title="Miles Per Gallon">mpg</acronym> app to keep track of my trucks mpg The best I can get is 11.7 highway 10.4 in town and 9.5 towing. These seem very low compared to most guys.
I baby this truck and always try to keep it under 2000 rpms, any ideas what could be causing such bad mpg ?
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Turn your tuner back a little and see what happens to your mileage.
When I bought my truck, the PO had the tuner set to "race truck".
I was getting 12 miles / gallon, sound familiar?
I turned the tune down to mid range and got all the sensors (including the exhaust back pressure switch) working.
I average about 21+ mpg on the interstate at the speed limit and 16-17 around town.
Most of the time for a tank of normal mixed city hiway driving the lie-O-meter is around 19.5
This is a 2002 CCLB 4X4, 7.3 with 250K on the clock
LA
When I bought my truck, the PO had the tuner set to "race truck".
I was getting 12 miles / gallon, sound familiar?
I turned the tune down to mid range and got all the sensors (including the exhaust back pressure switch) working.
I average about 21+ mpg on the interstate at the speed limit and 16-17 around town.
Most of the time for a tank of normal mixed city hiway driving the lie-O-meter is around 19.5
This is a 2002 CCLB 4X4, 7.3 with 250K on the clock
LA
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Posting Guru
Joined: Aug 2007
Posts: 1,714
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From: Canton, IL
Check this one. if it is unplugged, plug it in. Otherwise, Remove the sensor, clean it, take a piece of wire to the tube and make sure the tube is clear, (not plugged up).
Change the fuel Filter. and air filter.
Otherwise, if that doesn't help, My suggestion is take it for a good aggressive drive with a big dose of Diesel Clean (grey bottle) in the fuel tank. I think since you've been driving so nicely, the pistons and exhaust valves are collecting soot. (carbon). Run it really good, stretch it's legs, make it breath heavy.. Blow some of that old snot out of it.. get it up to temp for a good while.
Then when you notice a difference in performance, change the oil and filter.
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Thats not where the sensor is though. The sensor is on the front of the engine, to the left (as you face the engine) of the HPOP reservoir. ( near the AC compressor pulley.) A 'sensor on a stick' is what it looks like. it is mounted on the end of a vertical tube.
Check this one. if it is unplugged, plug it in. Otherwise, Remove the sensor, clean it, take a piece of wire to the tube and make sure the tube is clear, (not plugged up).
Check this one. if it is unplugged, plug it in. Otherwise, Remove the sensor, clean it, take a piece of wire to the tube and make sure the tube is clear, (not plugged up).
The primary function of that sensor is EBPV operation.
For any vehicle that is losing fuel economy with no MIL illuminated on the dash, maintenance items are the first to look at. I assumed the OP had already checked the normal stuff such as air filter, tire pressure, alignment, oil and filter, etc.
With the 7.3L in particular, if maintenance items check out fine, the most common suspect is a boost and/or exhaust leak. It's extremely common on these trucks, especially if there has been any modifications performed in the past.
A truck with an upgraded turbo...... I'd be looking at the up-pipes right behind the turbo first.
Posting Guru
Joined: Aug 2007
Posts: 1,714
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From: Canton, IL
The sensor will not have any effect on fuel economy, especially if the truck has ditched the EBPV for the aftermarket exhaust brake.
The primary function of that sensor is EBPV operation.
For any vehicle that is losing fuel economy with no MIL illuminated on the dash, maintenance items are the first to look at. I assumed the OP had already checked the normal stuff such as air filter, tire pressure, alignment, oil and filter, etc.
With the 7.3L in particular, if maintenance items check out fine, the most common suspect is a boost and/or exhaust leak. It's extremely common on these trucks, especially if there has been any modifications performed in the past.
A truck with an upgraded turbo...... I'd be looking at the up-pipes right behind the turbo first.
The primary function of that sensor is EBPV operation.
For any vehicle that is losing fuel economy with no MIL illuminated on the dash, maintenance items are the first to look at. I assumed the OP had already checked the normal stuff such as air filter, tire pressure, alignment, oil and filter, etc.
With the 7.3L in particular, if maintenance items check out fine, the most common suspect is a boost and/or exhaust leak. It's extremely common on these trucks, especially if there has been any modifications performed in the past.
A truck with an upgraded turbo...... I'd be looking at the up-pipes right behind the turbo first.
May not matter on your modified truck, but for a stock truck, it matters..
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
I dare you to unplug it and drive a tank out.. You don't get a code, or a warning light, but it does matter. It does effect MPG, and power. Backpressure affects injection timing, which effects power and MPG..
May not matter on your modified truck, but for a stock truck, it matters..
May not matter on your modified truck, but for a stock truck, it matters..
Tested with sensor unplugged. Tested with sensor plugged in but removed with a cap on the end of the sensor, and the tube plugged (ran that one for about 2 years actually).
All tests resulted in MPG change = zero
And please understand that timing does not look at backpressure. I know because I do my own tuning, so I can see what the calibrations are looking at.
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
Maybe time to check the brakes as well. Super Duty's are known for sticking calipers. In fact I am in the middle of sorting mine out. Started lubing everything up and found a frozen slide pin.
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