Loud turbo 5.2 Isuzu turbo is loud and whines very high but has no power???

turbos normal make a whining noise under load noise may be present more then before if you have changed anything on the intake side sometimes it can be as little as a lest restricted air filter other cause is lose piping but some power loss would be noticeable if this was the cause
hope this helps good luck

Start at the turbo and check for loose or blown air lines . Check the intercooler for cracks. The turbo whine is normal but you would not be hearing it as the turbo is controlled to vary the amount of boost needed for the throttle setting. If you have to use starting fluid to start a diesel then it is time to consider a re-ring and bearings for the engine.

It's your turbo it might be dead or boost pipe has come off

It maybe the problem of V8 6.5 turbo diesel. To use the turbo success, the car must be reached the high certain speed. So it maybe the normal that whining sound coming from engine. Diagnostic engine regularly.

Some whine is not really a problem and is not worth the cost to replace the turbo. You have more than likely heard trucks with turbo whine and they don't worry about it. If the whine is really loud then the turbo has a worn bearing and it will need to be replaced in the near future or it will seize up eventually.

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could be the turbo but check all turbo hoses carefully for splits

Mine has a high pitched whistle at high rpms and I can't figure it out. But mines def not the tranny. I'm thinking it's a vacuum line somewhere. It's a 97 2.3l manual. The colder it is the louder...

fuel pump,some are inside the tank some are not.If its outside the tank it should be quite easy to fix.

Does this appear to happen when the fan is going? Try having your fan belt checked.