yea you need the turbo on a turbo engine for it to run correctly.
I had a pos sunfire with a busted turbo, we wired the wast gate opened.. ran like shit.
basically you want to check for any shaft play first.. take the accordion hose off and gently try to wiggle the blades side to side. then in and out.. GENTLY!
any movement beyond .5mm (so small its hardly even noticeable) and yes it needs rebuilt. Check your coolant line running into the turbo to see if it's hooked up properly. check for oil collection on the blades.. look for blue smoke comming out of the turbo. these are all signs of it being on it's way out.
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