Mild mods poor MPG- newbie
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Junior User
Joined: Nov 2013
Posts: 59
Likes: 0
From: Madison, AL
Mild mods poor MPG- newbie
The problem: 13.3 MPG 50/50 gentle driving on dp-tune 80E. This is my first diesel and I have owned it since Oct 13. I have done the hutch, harpoon, hpx, and frx (black spring), since owning the truck. The rest (see signature) was how I bought it. I am average 13.3 MPG hand calcuated since doing the harpoon mod (fill the neck up everytime), earlier calculations may have varied due to not filling to the same point. I have been using Optilube XPD every fill up because it was given to me. Fresh T6 in the engine and fresh Max life in the tranny.
What am I missing here? I should be getting ~16mpg. What am I missing? I am trying the stock tune on this tank to see if it is better, but so far the meter (if correct for stock) is saying 13.9. Usually reads 18.2 when in the 80E tune. The truck also feel like a slug that cant get out of its own way on stock, surely I have an issue and Ford didn't sell such a turd from the factory.
Things I have checked.
-fuel leaks
-bearings/brakes/hubs unlocked, minimal rolling resistance, hubs tight
-air filter
-ebpv open (I think see pics)
-boost leaks (4psi at 65mph) there is some leakage at the boot going into the heads (see pics)
What am I missing here? I should be getting ~16mpg. What am I missing? I am trying the stock tune on this tank to see if it is better, but so far the meter (if correct for stock) is saying 13.9. Usually reads 18.2 when in the 80E tune. The truck also feel like a slug that cant get out of its own way on stock, surely I have an issue and Ford didn't sell such a turd from the factory.
Things I have checked.
-fuel leaks
-bearings/brakes/hubs unlocked, minimal rolling resistance, hubs tight
-air filter
-ebpv open (I think see pics)
-boost leaks (4psi at 65mph) there is some leakage at the boot going into the heads (see pics)
Thread Starter
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Junior User
Joined: Nov 2013
Posts: 59
Likes: 0
From: Madison, AL
I will try to locate a scanner but my ebpv is unplugged. If this is the case does it matter what the sensor reads or if the tube is clogged?
How do I check for boost leaks other than looking for oil residue like in the above pic?
How do I check the up pipes?
How do I check for boost leaks other than looking for oil residue like in the above pic?
How do I check the up pipes?
Cargo Master
Joined: Jan 2005
Posts: 2,902
Likes: 2
From: Pasadena, Maryland
I made something like this. I took my intake hose into Home depot and had the plumbing guy give me a hand...We came up with this. 10-15 psi is all you need...This will pressurize your intake system and any leaks you may have will readily appear. Take the intake hose off the air filter and put this in its place.
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Duncan is correct. The PCM uses the sensor to alter fuel/timing curves. If it is off, so will your mileage be. With your mods, driving gingerly you should see 15-16 easily, if not better, in mixed driving, hand calculated. So I would do as Duncan says, and check EBP sensor and tube, there should be many threads with a discussion on how to clean and visually inspect it. If that checks out, I would then suspect an up-pipe leak. There are 2 accepted ways to remedy that situation. Replacing the donut gasket with a Chevy small block exhaust donut( I believe) or the preferred method of going to bellowed up pipes from either International, or Dorman sells a cheaper set (Chinese-lower quality as far as fit and finish).
Riff Raff has a nice set and Clay will have them ceramic coated if you like.
International Bellowed Up-pipe Kit 99.5-03 - Riffraff Diesel Performance
Riff Raff has a nice set and Clay will have them ceramic coated if you like.
International Bellowed Up-pipe Kit 99.5-03 - Riffraff Diesel Performance
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Thread Starter
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Junior User
Joined: Nov 2013
Posts: 59
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From: Madison, AL
The up pipes look like a pain to change. What should the ebpv sensor read if all is clean and functioning correctly?
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Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Definitely within a pound or two of barometric pressure at most. If it is off more than that, you have an issue. Cleaning it may cure it, if not replacing it, isn't bad. 20 minute job start to finish. Up pipes are a bear from what I hear. I am contemplating tackling them here in the near future as I have a pretty bad leak and poor mileage, boost and high EGT's to show for it.
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Junior User
Joined: Nov 2013
Posts: 59
Likes: 0
From: Madison, AL
Was curious how the high pressure would effect the ECM input and found this...
At increased back pressure levels, the engine has to compress the exhaust gases to a higher pressure which involves additional mechanical work and/or less energy extracted by the exhaust turbine which can affect intake manifold boost pressure. This can lead to an increase in fuel consumption, PM and CO emissions and exhaust temperature. The increased exhaust temperature can result in overheating of exhaust valves and the turbine. An increase in NOx emissions is also possible due to the increase of engine load.
From here
Engine Exhaust Back Pressure
Not sure how the pressure varies wrt load, but if it is minimal then it Seems like deleting the tube, plugging the manifold and cleaning the sensor would be a good permanent fix.
At increased back pressure levels, the engine has to compress the exhaust gases to a higher pressure which involves additional mechanical work and/or less energy extracted by the exhaust turbine which can affect intake manifold boost pressure. This can lead to an increase in fuel consumption, PM and CO emissions and exhaust temperature. The increased exhaust temperature can result in overheating of exhaust valves and the turbine. An increase in NOx emissions is also possible due to the increase of engine load.
From here
Engine Exhaust Back Pressure
Not sure how the pressure varies wrt load, but if it is minimal then it Seems like deleting the tube, plugging the manifold and cleaning the sensor would be a good permanent fix.
Cargo Master
Joined: Jan 2005
Posts: 2,902
Likes: 2
From: Pasadena, Maryland
Was curious how the high pressure would effect the ECM input and found this...
At increased back pressure levels, the engine has to compress the exhaust gases to a higher pressure which involves additional mechanical work and/or less energy extracted by the exhaust turbine which can affect intake manifold boost pressure. This can lead to an increase in fuel consumption, PM and CO emissions and exhaust temperature. The increased exhaust temperature can result in overheating of exhaust valves and the turbine. An increase in NOx emissions is also possible due to the increase of engine load.
From here
Engine Exhaust Back Pressure
Not sure how the pressure varies wrt load, but if it is minimal then it Seems like deleting the tube, plugging the manifold and cleaning the sensor would be a good permanent fix.
At increased back pressure levels, the engine has to compress the exhaust gases to a higher pressure which involves additional mechanical work and/or less energy extracted by the exhaust turbine which can affect intake manifold boost pressure. This can lead to an increase in fuel consumption, PM and CO emissions and exhaust temperature. The increased exhaust temperature can result in overheating of exhaust valves and the turbine. An increase in NOx emissions is also possible due to the increase of engine load.
From here
Engine Exhaust Back Pressure
Not sure how the pressure varies wrt load, but if it is minimal then it Seems like deleting the tube, plugging the manifold and cleaning the sensor would be a good permanent fix.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Your quote is what happens with actual high backpressure, not what happens with a false high backpressure reading.
Do you have a smart phone, scan tool, tablet, laptop/netbook, or a friend with such devices?
