Dissapointed in my 99 Power Stroke :-( - Ford Powerstroke Diesel Forum
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post #1 of 34 Old 07-22-2014, 02:27 AM Thread Starter
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Dissapointed in my 99 Power Stroke :-(

So two months ago I bought my low mileage (85k) '99(build date 4/99) supercab XLT. I have some issues all addressed now but even with all the money I have spent on it my mileage is terrible. I'm getting 10mpg at best in town. I have friends with 99' PS that are getting much better.

I went from a 2009 Jeep Commander with a Hemi and was getting 11.5 in town, 11 towing 7k at 70+ mph(with reserve power I might add) and easily got 17+ on the highway empty.

I thought and was told a diesel could do all that the Hemi could do and more and I'm disappointed to say the least.

I'm a mechanic, I have my degree from Nashville Auto Diesel College, I work on Diesel Electric locomotives and I understand engines and how to make them efficient. This truck responds in a negative way to everything I try to do to make it more efficient.

Is 10mpg in town and driving it like and old grandma normal? If so its time for another gasser. This truck is in perfect condition right now. I have had other hands and eyes on it and have gone over it, replaced everything that needed replacing. I don't understand why my Power Stroke just does not run right and efficient. Can someone give me something to look for?

To date I have;
Replaced the IPC, repaired all boost leaks, replaced the fuel filter, checked the up-pipes. Everything is good. No codes either. Its all stock, stock tires, no lift etc.
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post #2 of 34 Old 07-22-2014, 03:22 AM
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Something's still not right with it. In my '01 CC 4wd I get 16 around torn and better if I baby it. Heck, pulling my 26ft travel trailer, I'm getting around 11mpg.

You are getting this, hand calculated, not from the overhead computer, right?
No codes when you pull codes with a scan tool that can actually pull the extended Ford codes? A cheapie code puller can't pull codes from these trucks.
Whois the turbo? The veins? How much boost can you get out of it?


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post #3 of 34 Old 07-22-2014, 03:28 AM
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Sticking or hanging calipers, stuck ebpv, impeller wheel looking rough? Injectors pass a contribution test?

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked
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The stock downpipe in an OBS is flat because I'm a ginger.
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post #4 of 34 Old 07-22-2014, 07:20 AM
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I'm getting 14.5 mpg or so and I have a 4x4 2001 7.3 CCSRW, when I bought this truck a month or so ago, it was a dog, ran okay but I found out that the tire pressure was 40lbs in each tire after putting the right tire pressure was amazing how much pep it put back in the truck.

But 10 mpg is way off, I was getting 11.2mpg with my 2000 7.3L(RIP) towing a 8K travel trailer.

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post #5 of 34 Old 07-22-2014, 08:06 AM
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check your ebps sensor and tube

DD- 11 6.7 scsb: sct4 gearhead tunes, 4" dpb axle dump exhaust, 2.5 level, fox shocks, no limit egr delete, no limit stage 2 intake, STT PRO 295/65r20, black fuel couplers

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post #6 of 34 Old 07-22-2014, 11:33 AM Thread Starter
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My mileage is hand calculated. I do plan on cleaning the exhaust tube and sensor soon.
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post #7 of 34 Old 07-22-2014, 12:47 PM
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Don't clean the EBP sensor. Once the diaphragm inside is buggered it needs to be replaced. And that can make a significant difference.

Then replace the IPR. It's difficult to impossible to diagnose a faulty one, put power and mileage will be lost if it's not functioning properly.

PIS 230/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
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Dual SD fuel pumps, in tank mods, CNC Fab bowl retain kit. SDK Tunes. Isspro.
Still pretty slow, just less slow now.
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I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.

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post #8 of 34 Old 07-22-2014, 02:59 PM Thread Starter
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Quote:
Originally Posted by Joel View Post
Don't clean the EBP sensor. Once the diaphragm inside is buggered it needs to be replaced. And that can make a significant difference.

Then replace the IPR. It's difficult to impossible to diagnose a faulty one, put power and mileage will be lost if it's not functioning properly.
Is the IPR located near the IPC? Thats an expensive sensor! I thought the IPC was too much at $160
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post #9 of 34 Old 07-22-2014, 03:33 PM
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My 96 F Super Duty gets better mpg than that and it has 4:63 for rear end. I get around 14 mpg
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post #10 of 34 Old 07-22-2014, 06:11 PM Thread Starter
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Quote:
Originally Posted by 351fifty View Post
Sticking or hanging calipers, stuck ebpv, impeller wheel looking rough? Injectors pass a contribution test?
Calipers are good, as far as I know the ebpv is good, impeller looks new. No idea about the injectors
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