urgent help NO BOOST - Ford Powerstroke Diesel Forum
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Old 01-16-2013, 05:55 PM
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urgent help NO BOOST

Been working on a customers 05 6.0 and had to remove the turbo to replace the rubbers hose to the egr cooler. Line was leaking. Installed all new orings on everything. New oil feed gasket and oil feed oring and orings on drain back tube. Truck made good boost before I took it apart. Now I have nothing. The turbo sat on the work bench for about a week. In the time it sat could the unison ring on the varible vane have seized to the housing? Or could the actutor have gone bad? I cleaned the exhaust back pressure sensor. I'm at the end of my patience with this truck. This truck has been so half assed in the past its like every corner I turn I find ****ty work or failing parts your guys help would be greatly appreciated.

Thanks,
Nathan
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Old 01-16-2013, 06:06 PM
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Make sure your Mass Air Flow sensor is connected and check the rubber hose that goes from the intake manifold up to the MAP sensor.
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Old 01-16-2013, 06:16 PM
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Map sensor is good. And truck has no mass air.
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Old 01-16-2013, 06:25 PM
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There's no way the unison ring seized while sitting off the trick for a week and unlikely the VGT solenoid went bad. You check the VGT connection? I've seen the tabs break and not keep the connector in place and cause a bad connection. Any codes?
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Old 01-16-2013, 06:33 PM
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No codes. One tab is busted off the the vgt but the other one clicks and holds it on. Truck starts and idles great just when u drive it has zero boost.
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Old 01-16-2013, 06:37 PM
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Hate to ask this but it is easy to get frustated and over look the easy simple things. Have you checked for exhaust leak at the up-pipe? Are all of the boots and CAC tubes tight?

Sent from my GT-P5113 using AutoGuide App
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Old 01-16-2013, 06:38 PM
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Even though the black hose from the MAP sensor to intake is hooked up, have you checked the hose for splits or cracks? Can you hear any hissing or air rushing under the hood when running or trying to accelerate?
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Old 01-16-2013, 06:47 PM
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I'm going to triple check everything again tommorow and then check back in with u guys. hopefully i just overlooked something simple.
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Old 01-16-2013, 08:09 PM
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Stick a bobby pin or needle or something small into the copper barbed fitting that sticks up out of the intake manifold that the MAP hose connects to. Sometimes they get clogged up and need cleaned out and can cause a misreading of no boost through the MAP sensor.
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Old 01-17-2013, 02:16 PM
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Checked everything again when i got home. Did clean the map sensor port out to check.
Took it for a drive it mad about 10psi and is very sluggish on making it. Still got a feeling it is the unison ring sticking. No codes yet.
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