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Old 04-28-2014, 10:27 AM
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Turbo Issue

Recently my truck (03, 7.3) has been stuck at 7-10 psi boost while driving on flat road at about 70-75 mph. In the past I would see no boost while just cruising on level ground. This is causing my mileage to decrease from 23-25 to more like 10-12. I replaced the turbo, and whole motor in fact, about 10K miles ago. It has been doing this for about 3500 miles now. My thought is it has something to do with the wastegate not function correctly. Has anyone experienced anything similar? Where should I start looking for the solution?
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Old 04-29-2014, 02:03 PM
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Removed turbo intake searching for cause of leak. Found oil puddle up in valley of the 7.3 block. Can't seem to locate the source of the oil leak. 99 Ford F250 Powerstroke. Motor has 88,000 miles on it. Any suggestion to look for source of leak.
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Old 04-29-2014, 11:45 PM
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see if redline to wastegate is hooked up
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Old 04-30-2014, 12:50 AM
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At 70mph you should DEFINITELY be seeing boost. 7-10 psi sounds right on the money to me.

You also never got 23mpg. Famous 7.3's with tons of money spent to increase mileage don't reliably get 23mpg.
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Old 04-30-2014, 10:04 AM
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flat ground, at 70mph...2050rpm, 2# for me
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Old 05-04-2014, 12:27 PM
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Checked red line to waste gate and it seems fine. Before the new motor I would run 0 psi going down the highway now I'm always seeing some boost. Doesn't seem normal to me but if that is what other people are seeing maybe it is more normal than I think. Sorry to disappoint all those "famous" 7.3's out there, but before my old motor went I was reliably and consistently averaging 28 mpg on the highway. Although to be fair, I rarely ever drove faster than 55 to accomplish that.
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Old 05-04-2014, 01:35 PM
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Lol... No you didn't, no 7.3 gets 28mpg. Are you going by the trip meter? Sounds like you are. They aren't even close to accurate.


And getting boost at 70 on the highway is correct. You're right in the powerband of the motor.

You replaced the turbo, if your old one had a worn wheel or you had a boost leak that would explain the difference between then and now.
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Old 05-04-2014, 03:22 PM
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i consistently see 5 psi of boost at 70 on flat ground.
i dream of getting 16 mpg let alone 28
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