i gotta 00 f350 and milage on it sucks as well as power, on the highway empty it gets 12 maybe 13 at best, with 8000 pnd. trailer it drops to 9 or 10. when i bought it new it got 16 highway and 14 towing, had it at ford many times, they reflashed the computer at least three or four different times to no improvement, tried different air filters, added exhaust nothing seems to help, ford decided it had a blown head gasket and replaced it with still no improvements, they decided it was due to "winter fuel" dont buy it cause it does the same all year long. what do we do here. i am frustrated. my buddy has a 6.0 PS and it is strong and even friends i have w/7.3 PS have more power. i think i need help as well

 

Well, sort of glad to hear i'm not the only one. At least it validates my concerns. These engines have been around for so many years, there must be something in common that someone has learned how to correct by now. Both of our engines are 2000s. Think it could be smaller factory injectors on both of our trucks? Ford dealerships have never been a good source of technical help for me. Ford is my absolute last resort, very disappointing experiences in the past.

Anyone else having the low power & low mpgs? Any more ideas for solutions?

 

Well Robert her in Arizona, is having the same problem. I have a 00 and Ive believe my low power is the miles. If not everything else thats broke the past two weeks. It used to keep up with my dads 6.0 with exactly the same trailers and fuel tanks levels. Now, ive prob cause the lack of power because of maintainance. We are trying to figure Robs out too, he has air pressure in his hpop. Now I need to pull up the oil galleys on my ford dvd to see if the turbo can leak across to the oil galley. If this were to happen, the air would compress and not allow correct firing of the injectors. Hmmmm anyone else?

 

mine has 75k on it and maintance has been persistant, oil change every 4000, fuel filter every 10k and air filter tryed K&N and napa gold and even factory, trans fliud every 30k, so we can rule that out i think. if its smaller injectors that are possibly the offender here what size do we change to and how hard are they to change? will a a chip change help with out the injectors or will the injectors be enough? i have talked with one other person with a 00 and they had the same issuses as we describe. how do you check the waste gate and some of the other stuff mentioned earlier in these posts? sorry if im a bit behindjust found the post and it sure sounded like a similar thing to mine.

 

grt2bbig,
Do you have any gauges on you truck? If you are still running stock & feeling underpowered, i'm gonna guess you're only seeing around 16 psi. If you haven't already install one, a boost gauge will give you a good measurement of how much power you are making. Some say that a stock engine should make a max between 18 & 21 psi. I think mine was only making about 15, i don't remember for sure.
I have tried a variety of chips & modules. The best i ever ran was an SCMT stacked with an Edge Juice/Attitude. Gave me the most power & fuel economy. Got 14.5 mpg towing from St. Louis to Boston. Once i moved to Boston it went down to 11. Lowest ever was just above 9 mpg, spent allot of time idling to thaw when we had that 32" snow.
Even now i am running a 100 hp chip with extra timing & still barely getting over 12 mpg highway. I never had tons of power. Maximum with the previously mentioned combo was 27 psi in very, very cold weather. At that time, my truck had tons of ICPs & timing from the combo. So much so that the engine ran extremely rough. So rough i couldn't really hold it at a stop with the brakes, especially in the snow. The engine screamed to life with power, like lightning.
This phase of power would actually come & go. Only did it when it was very cold out. I loved it when this happened, though i feared it may throw a rod or cause some other internal damage. Still, all sensors are now testing fine. I do not know what is up. A chip that gives you more timing will give you better fuel economy, but it hasn't done much for mine. I tested a tank in every configuration i could & city mpgs never went above 11 mpg. & i drive with a very light foot.
We should dig further into finding out about our injectors. If i have to swap mine, i'll want to make it worth while & add something with a minimum of 50 hp increase. The Single Shot injectors sound like a safer bet from what i've read. Seems that the Split Shots are possibly harder to tune, not the best design for a PSD.
-Matt

 

Just my .02 cents. The GTP 38 turbo on are trucks do not like to go over 25 psi as I recently found out when I cranked mine up to 30 it started pumping oil out the exhaust at idle and filling the crankcase with soot when I was on it. Another thing is that I would think since you are getting black smoke you have plenty of fuel. Where is your boost gauge connected? Mine is in the AIH port. I am also getting around 17 mpg average. Try removing the muffler, when I took mine off it was like adding my chip again.

 

My boost gauge is mounted on the engine side of a blow off valve in the hose that goes to that MAP sensor. I've heard that removing the muffler makes the truck much louder. Is that just from outside the truck or will it make it much louder inside as well? My tires are actually louder than my engine now. Not what i expected from Toyo Open Country A/Ts. Most people report more change in sound than power or mpgs. I'll try it if it won't be too loud.

 

I have te 4" MBRP exhaust and it is not much louder inside the truck, but outside I like it!! I also have an 00, but since I got my chip from Jody at DP-Tuner about 3 weeks ago, I have been at 30psi a couple time (and tripped my SES light). I jsut did a trip this weekend into the mountains with no towing and got 17.8mpg on the 80hp econo tune, and that was passing everyone I could see on the freeway that looked they wanted to try and race me. One thing I never see is the black smoke that everybody here talks about????

 

I'm really only seeing black smoke when i turn up the ICP potentiometer i have stacked with my chip. The chip burns very clean. I still turn up the other because it is giving me more power & driveability on top of the 100 hp chip. Black smoke is unburned fuel. Nothing good about it. Power that's not being made, but it takes some to make smoke.

 

This really sounds like low fuel pressure to me.
Don't trust a reading at just idle, there is no fuel demand. You have to get a long hose on the guage and go drive it. See if the fuel pressure drops at full throttle while going up a big hill or something.

 

Hi Dan,

Well, we got 75-80psi at idle. It was really bouncing back & forth between the two. We checked it while it was still on the dyno. As it accelerated, it smoothed out. He got it up to about 90 mph with the tires turning. The gauge peaked at 90 or 95 once when he really popped it in 3rd gear. Shouldn't that be plenty of fuel pressure.

Fuel pressure was one of the first things we checked. They'd had another truck in there with exactly the same problems. Low power, 11 mpg. Checked the fuel pressure & it was weak. Determined the fuel pump needed replacing. Swapped it out & the truck instantly gained 6 mpg & the power it should have had.

Would the load from the dyno not have been enough? I watched the gauge to well over 3,000 RPMs. There were 3 of us actually watching the gauge. Cale was satisfied that there was plenty of fuel pressure. Do you have any other ideas?

 

I don't have any smoke and mirror cure for yours but I can tell you that I have done the same mods to Xsesyv and my Superduty. The Super is a later production model and the X will out snort the Super at anthing, mileage, pulling. Same thing with my boost. The X has seen 42psi and the Super has made 24psi. I haven't got to try the new SP Diesel plug in map sensor fix. I wanted to know for sure it wasn't defueling. I would think that defueling would show up on the dyno as a HP drop.

 

Ok, kwik is back and his first suggestion is what I thought too....Great minds but his is greater....this thread and the one below named MY TRUCK IS VERY SICK are having much the same issues. Im trying to help local and were stuck on how air got in his hpop. I know the air will compress and not pop the injectors but how did it get in there. Have you checked your hpop by pulling the plug and checking oil level? Please do so and be careful, Rob allen cap came flyin out under pressure.

 

i dont have any gauges on mine i was wanting to put a boost gauge and exhaust temp and trans temp gauge. so i dont know the exact numbers im getting for boost. i keep hearing to remove the muffler i have a 4 inch exhaust so not sure if that would even do any good on mine or would it? is there a way to up the boost on the turbo with outa chip or computer or is everything computer controlled? one thing i do notice is the acceleration from a stop just plain sucks.its not as bad as when it is cold but it still sucks. there is a noticeable amount of oily residue on the intake hoses going from the airfilter into the turbo, is this normal or signs of a problem? sure seems like there should be some logic if some of us are haveing the same issues. how due you tell if its the injectors. will a fuel pressure test tell this.

 

For starters a stock turbo is not going to make 32Lbs. of boost. 25 would be max on a good day.Fuel pres. is not going to be that high either.A stock fuel pump is around 50-55 psi. not 70 plus. not possible for 95 psi.And the dyno he has, has a brake on it to load the truck to pull it harder than any trailer could. sounds to me that your a flake.