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Discussion Starter · #1 ·
Hello all,
Let me start by saying I am new to diesels. I recently aquired a 2000 f350 1ton with a 7.3 powerstroke, automatic, 99k miles, 8'' lift, 38'' tires, looks like a custom 3 1/2 '' strait pipe exaust from the downpipe back and K&N filter.

IT ALSO HAS ONLY BEEN GETTING 10-11 MPG!

When I got home with the truck I noticed that the filter was completely clogged with dirt and mud and. After swapping it with a stock filter for the time being and changing the oil (rotella 15w40) and filter and about 4k in front end work (ball joints left and right upper and lower, steering rack, tie rods, ect) Most of the Previous damage had been corrected. but I was still blowing alot of black smoke at take off under full throttle and it would clear up after a while. and I appear the have a small oil seap from somewhere under the turbo that comes down to the trans but isnt enough to drip on the driveway...

I recently noticed a 3 inch rip in the intake boot going directly into the turbowhile looking for the cause of the oil seap! I immediatley replaced it and re installed the K&N after I thourouly cleaned and re oiled it.

Now I have a very small amount of white-ish/ gray-ish smoke just at take off under heavy throttle but no more black smoke. I havent driven it enough yet to see if my fuel economy has been getting any better.....

What do you guys think?

I also took a picture of my turbo fins when I replaced the boot...wanted to know if it still looks ok...I diddnt feel any play in the fins but there is a small chip in one....probably from all of the off roading this guy did previous to my owning it. what do you all think of the turbo?

 

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The edges still look sharp. Most all of our trucks will blow black smoke under full throttle, so I wouldn't worry about that. I would suggest pulling the K&N one more time, lets say the day before trash pickup so you'll have it ready...

You're not going to get the 19MPG I get with a 2WD stock tire sized 3.73 geared PSD. Especially if your default take off from a stop is full throttle :nono:

To get the most MPG from this truck, you have to accelerate modestly, getting it to shift into OD as quickly as possible. Then maintain your speed at all costs - trying to keep the tach just under 2,000 RPM.

If you want a good intake system, consider the Tymar filter or the Ford Severe Duty AIS. There are some basic maintenance things you can do for mileage, such as cleaning your exhaust back pressure tube ( Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page ) and minimizing drag ( Welcome to guzzle's Front Caliper Slide Pin Upgrade Web ) - but basically you're driving a vehicle with the aerodynamic characteristics of a brick.

Edit: your oil leak is probably from the turbo pedestal or the EBV valve - here's a great place to get replacement o-rings ( http://www.dieselorings.com/index.php?page=categories&group=6 ) - there are instructions on each item's page.
 

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Hello all,
Let me start by saying I am new to diesels. I recently aquired a 2000 f350 1ton with a 7.3 powerstroke, automatic, 99k miles, 8'' lift, 38'' tires, looks like a custom 3 1/2 '' strait pipe exaust from the downpipe back and K&N filter.

IT ALSO HAS ONLY BEEN GETTING 10-11 MPG!

When I got home with the truck I noticed that the filter was completely clogged with dirt and mud and. After swapping it with a stock filter for the time being and changing the oil (rotella 15w40) and filter and about 4k in front end work (ball joints left and right upper and lower, steering rack, tie rods, ect) Most of the Previous damage had been corrected. but I was still blowing alot of black smoke at take off under full throttle and it would clear up after a while. and I appear the have a small oil seap from somewhere under the turbo that comes down to the trans but isnt enough to drip on the driveway...

I recently noticed a 3 inch rip in the intake boot going directly into the turbowhile looking for the cause of the oil seap! I immediatley replaced it and re installed the K&N after I thourouly cleaned and re oiled it.

Now I have a very small amount of white-ish/ gray-ish smoke just at take off under heavy throttle but no more black smoke. I havent driven it enough yet to see if my fuel economy has been getting any better.....

What do you guys think?

I also took a picture of my turbo fins when I replaced the boot...wanted to know if it still looks ok...I diddnt feel any play in the fins but there is a small chip in one....probably from all of the off roading this guy did previous to my owning it. what do you all think of the turbo?

You are fighting a losing battle with mileage as long as you have an 8" lift and 38" tires. I agree with RT...it is like pushing a sheet of plywood down the road. As far as the turbo damage goes...yes it has a couple of chips but as long as there is no free play in the wheel for or aft or side to side I wouldn't worry about it for now unless you have lots of money to spend...then upgrade it to Garrett GTP-38R or similar turbo. Check around your EBPV in the pedestal and between the turbo and the pedestal for your oil leak. That is most like where your oil is coming from.
Learn to drive it like you have an egg under the gas pedal and your mileage will improve but don't expect 18-19 mpg with the lift and tires you are running. Just my two cents.

Griz
 

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++UPDATE. just went to Lunch and the smoke color I mistook this morning for white/grey was actually just a thin Black smoke.

NOt sure if that makes a diffrence overall but I will keep an eye on it.
Are you sure you don't have a chip installed? Or a re-programmed PCM? If the previous owner was a serious mudder, I would expect it to have one or the other. That would explain the black smoke and crummy mileage.
 

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Are you sure you don't have a chip installed? Or a re-programmed PCM? If the previous owner was a serious mudder, I would expect it to have one or the other. That would explain the black smoke and crummy mileage.
I was thinking the same thing. Sounds like the previous owner wasn't worried about mileage...just having fun tearing up the mud. I would ask him/her if there is a chip installed or has the PCM been reprogrammed. This might explain the black smoke issue.

Griz
 

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I'd consider changing the wheel due to the chip on one blade. That wheel can spin over 100,000 rpm's at full tilt, so balance is kind of important. Otherwise, the fins look to be in great shape so it doesn't look like you need to rebuild the turbo or be worried.

I wouldn't worry about the slight black smoke either. That's normal for an engine under load. Is your speedo corrected? Was the truck re-geared to make moving those tires easier?
 

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Discussion Starter · #8 ·
Are you sure you don't have a chip installed? Or a re-programmed PCM? If the previous owner was a serious mudder, I would expect it to have one or the other. That would explain the black smoke and crummy mileage.
I have suspected this myself....although I cant find a box anywhere so perhaps a reprogrammed computer...
 

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Discussion Starter · #9 ·
I was thinking the same thing. Sounds like the previous owner wasn't worried about mileage...just having fun tearing up the mud. I would ask him/her if there is a chip installed or has the PCM been reprogrammed. This might explain the black smoke issue.

Griz
Only issue with that is I bought it from a used truck dealer...so There is no way of getting in touch with the previous owner.:thdown:
 

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Discussion Starter · #10 ·
I'd consider changing the wheel due to the chip on one blade. That wheel can spin over 100,000 rpm's at full tilt, so balance is kind of important. Otherwise, the fins look to be in great shape so it doesn't look like you need to rebuild the turbo or be worried.

I wouldn't worry about the slight black smoke either. That's normal for an engine under load. Is your speedo corrected? Was the truck re-geared to make moving those tires easier?
Where can I get a new wheel? I am sure that is something I am capable of.

My speedo is off about 10mph...I thought this was due to the large tire/wheel combo on the truck. I am not sure what the gearing is at unfortunately that is a problem with buying used! :thdown:
 

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I have suspected this myself....although I cant find a box anywhere so perhaps a reprogrammed computer...
You aren't looking for a box, but a circuit board plugged into the rear of the PCM. It's located in the cab just above the parking brake pedal. A stock PCM would have a plastic cover over it, but with a chip installed, a chunk of the cover would be cut off to allow clearance for the chip.
 
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