'02 5.9 No boost.
 

Any ideas as to why I have no boost,can't find any leaks,tied gate closed,still no good ???

Hundreds of ideas, from injection pump to map sensor to damaged turbine. Exhaust leaks. Anyone could guess all day. Only way to know is diagnose it and that's not an Internet kinda thing lol

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New injection & lift pumps,can't find any leaks,turbine looks good.Map sensor....hmmmm.....thanks.

Mine made low boost for awhile and it was because my valves were loose and stayed open. Just an idea

If your valves were loose they wouldn't stay open. And while overhead adjustments being off could cause performance issues, if they were loose enough to cause a low boost issue you'd likely be installing a cam and tappets.

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Is this something that gradually happened or all-of-a-sudden?:humm:

i would pressure test your system its easy and cheap and you will rule out most causes i did hear about a guy that had his manifold crack and was geting nothing for boost