HORRID fuel milage and power loss - Ford Powerstroke Diesel Forum
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  #1  
Old 01-05-2013, 03:22 PM
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HORRID fuel milage and power loss

I am getting approx 4-6mpg. I used to get 16mpg.

back story
I tore my truck down to "restore" it. I added an I/C and Boost cooler. They were the only 2 thing that I changed on the engine

I did add a different axle and made the truck a dually, but same gear ratio

And about 200 miles after I got the truck back together I put in a T500. But it was bad milage/poor power before that.

After its 1st 200 miles while doing the T500 i thought I had a boost leak. So I tore into the spider. It looked like the O ring was not sealing, so I got small oil filter square cut o-ring that fit alot better.

Today i am pressure testing the I/C and tubing. I have 10 PSI on it(dont think my caps are rated for much more) and it is holding. Any way to presureize the spider/turbo?
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Old 01-06-2013, 08:52 AM
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Did you actually mean "boost fooler"? If so, have you tried running without it? Have you tried running with the MAP sensor electrically disconnected? Can you pressurize all the way from the turbo inlet hose (at the breather adapter joint) to the intakes? Cheers!
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Old 01-06-2013, 09:11 AM
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Yes, boost fooler. Dam auto correct.
I was worried is was misleading the MAP, so i threw my scanner in and it reads the same as the boost gauge, just stops at 19psi like it is supposed to while my boost gauge goes right on up to 30psi.

I just pressurized from the turbo inlet. I can build lost of pressure and I see no leaks(spray bottle of soapy water on all joints). You just hear some air leaking around the valves/pistons(to be expected)

I am kinda stumped. I am going to try changing out the air filter and add a air filter restriction gauge. My thinking is the filter is loaded with sand from the sand blasting
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Old 01-10-2013, 05:19 PM
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Well, i think I fixed the power problem.

I compared my new 6637 to the old one. The new one I can see light through 360*. The old one, I can only see light through one pleat at at time(the one facing the light)
When I get my filter minder I am going to put the old filter back in and see what she reads

Now I can set my check engine light again for high boost( I need to adjust the boost fooler apparently)

And Now I know what is like to SMOKE 4 dually tires

I will have to top off the fuel tanks and do some NORMAL driving with it to see about the fuel milage.

Once I know the fuel milage is fixed, I will move the Map reading to the hot side of the I/C spider and adjust the boost fooler
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Old 01-11-2013, 12:13 PM
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Excellent! I'm sure the MPG will also go up. Cheers!
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Old 08-07-2013, 03:50 PM
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Back to this. The CEL was for Low/Hight HPOP pressure
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