Poor Fuel Mileage - Ford Powerstroke Diesel Forum
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Old 02-06-2011, 10:44 AM
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Poor Fuel Mileage

About 4 to 6 months ago my fuel mileage slowly started dropping. I was running up near 19-20mpg then and now I am see around 14mpg. I have no obvious issues, tire pressure is right, filters are clean/replaced. I use I think itís called Diesel Clean (White or grey bottle) fuel additive, the stuff that keeps your fuel from jelling and keeps the injectors lubed and clean (every tank in winter, once a month in summer.) The power seems to be normal. No noises except for the loud turbo, which sounds the same. Brakes donít feel to be dragging, or any kind of drag.

I was told to check the Mass Airflow Sensor by a Ford Diesel tech, which I quickly learned there wasn't one.

If I wasnít driving 100+ Miles a day I probably wouldnít care, but with full at $3.50 and that kind of mileage its kicking my as@.

Anyone have an idea? Has anyone seen something like this happen to them or heard of it?




Thanks
Josh

Mods
Banks Big Hoss level 5
Banks 6 Gunner
Banks 5 inch exhaust
Stage 2 intake w/ AFE Oil Filter
Ball Bearing Turbo
And some minor other things
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Old 02-07-2011, 08:03 AM
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If you can get your hands on a scan-tool, preferably a Snap-On Modus, do an injector balance test. This will tell you if you have any leaky injectors.

Also does your truck seem like a complete turd, barely build any boost, and sound like a jet engine until it warms up? If thats the case your EBPV might be sticking. I have that going on with mine right now. The easiest fix for that is to gut the EBPV out of your turbo pedestal. The EBPV is your exhaust back pressure valve. Its job is to close when your truck is cold and put a load on your engine, thus warming it up faster. If it sticks while your driving there is a tremendous load on your engine and you will just drink down the fuel.

Hope this helps you!!!
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Old 02-07-2011, 08:26 AM
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I already removed the EBPV when I replaced the Turbo last year, I will see if I can find someone with a scan tool, what should I look for when running the test?
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Old 02-07-2011, 08:31 AM
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When the test concludes it will tell you which injector(s) aren't in balance (in other words which one(s) are putting more fuel out then they are supposed to).

What the scan tool is doing is priming your fuel system and then firing one injector at a time and recording the drop in fuel pressure. If one injector is causing the fuel pressure to drop more than the rest then that injector is out of balance aka bad!!!
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Old 02-11-2011, 06:03 AM
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Interesting. Been having poor mileage myself for quite some time. Have been wondering about my injectors also. Let us know what you find out.
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Old 04-18-2011, 01:35 PM
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Wasn’t' the injectors, my Garrett GTP38R turbo had a manufacture defect. Just don't know if they will warranty it.
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Old 04-18-2011, 01:55 PM
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What was the defect so those of us with GT38Rs can take a look at ours?
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Old 04-18-2011, 05:59 PM
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The heat shield on the inside of the turbo acts as two different things. It’s a crush sleeve that seals the turbo on the inside and it also protects the bearing. What happened was the heat shield wasn't the right thickness, so what I was getting when the turbo was cold was a tin-ie sound. The heat shield was spinning inside the turbo, causing the exhaust gases to escape to the center of the turbo and at the same time was allowing the exhaust to hit the bearing area. So it cooked the bearing, when they went to replace the heat shield (the shop as a curtsey) they realized the bearing was toast too. Problem is I have been complaining about the noise for a long time, most of the life on the turbo and I finally decided to remove it and inspect (everyone telling me that there was nothing wrong with the turbo). I guess I was right, now what do I do since this problem is out of warranty now...
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