turbo pressure running high
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Junior User
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turbo pressure running high
hi guys, for the last week or so i've noticed my turbo pressure is running higher than normal and my mpg's have dropped 
. on flat ground usually there is little turbo to maintain speed, now 10 psi on flat ground. 20 psi going uphill is normal, now im seeing 35 psi to hold speed. there is now 27600 miles on my truck and i had the truck serviced at the ford dealer 1000 miles ago, including fuel filters. does any body have any idea why the change in turbo pressure and fuel mileage? ps the air filter restriction meter on the air intake is showing about 60 - 70 % restriction, but not in the red and no message on the driver display about changing the air filter like i've recieved in the past. thanks for any advice.
. on flat ground usually there is little turbo to maintain speed, now 10 psi on flat ground. 20 psi going uphill is normal, now im seeing 35 psi to hold speed. there is now 27600 miles on my truck and i had the truck serviced at the ford dealer 1000 miles ago, including fuel filters. does any body have any idea why the change in turbo pressure and fuel mileage? ps the air filter restriction meter on the air intake is showing about 60 - 70 % restriction, but not in the red and no message on the driver display about changing the air filter like i've recieved in the past. thanks for any advice.
More Turbo
Joined: Sep 2007
Posts: 525
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From: Centerbrook, Ct.
If it's been colder than usual where you are, that might have something to do with it. Colder air is denser and harder to move which could elevate boost pressure. Did you get a flash update at that latest service? Other than that, I'm out of ideas.
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as far as i know my truck has never been flashed, it still tells me the entire time the dpf is regening. tempurature yesterday high of 50, today 57. average for this time of year which is warmer than the last month that was running in the mid 20s and low 30s. i had no problems then.
Super Moderator
Joined: Aug 2008
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From: Frederick, MD
I would probably take a visual of the air filter. If it is showing 60-70% restriction then that may have a little to do with it. Sounds like it pretty much should be replaced anyway.
I would also tend to think fuel could play apart in this as well.
I would also tend to think fuel could play apart in this as well.
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i ordered an air filter yesterday and will put that in as soon as it is shipped. as far as fuel goes i always get my fuel from a local truck stop that has a high volume of truck traffic and i always run power power service diesel supplement+cetain boost. i am hoping that my thinking the air filter being restricted is cousing the exsesive turbo pressure to supply the air the engine needs.
Freshman User
Joined: Feb 2009
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Truckstop fuel isn't that great, from what I've seen and have heard others say as well. Run your truck out of that last tank and then run something like Shell or Chevron in it for awhile. Couple of tanks worth, maybe. You may pay a bit more at the pump initially, but you will make up for the price as you get a bit more pounce to the ounce, IMHO.
Seems like if I fill up at a Loves, Pilot, or Flying J, the truck feels a bit more doggy and I can tell it from the MPG I am getting, which is 2 MPG or so less than if I filled up at Shell or some other station that typically has a better product with a higher cetane level.
If that doesn't work, you could always take it back to the dealership and tell them that "Hey, siince the last service, this is what I've noticed."
Good luck.
Seems like if I fill up at a Loves, Pilot, or Flying J, the truck feels a bit more doggy and I can tell it from the MPG I am getting, which is 2 MPG or so less than if I filled up at Shell or some other station that typically has a better product with a higher cetane level.
If that doesn't work, you could always take it back to the dealership and tell them that "Hey, siince the last service, this is what I've noticed."
Good luck.
Posting Guru
Joined: Jun 2007
Posts: 1,501
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From: Henderson, NV
In cold conditions, the Turbocharger Actuator will close the turbine vanes; therefore engine exhaust back pressure builds up and creates more heat, thus warming up the engine quicker resulting in a little more boost pressure. This is more typical in warm up but could be a little of what your experiencing. You might benefit from a weather front from the dealer, I believe this was offered free in one of the TSB's as an address for snow clogging the air filters, if not i don't think it was priced to ridiculous.
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