Turbocharger: Testing and Inspection

Visually inspect the following points of the turbocharger system:

1. Check the air filter element to make sure that it is clean. If it is not clean replace it.
2. Check that there are no cracks, rips, cuts, or holes in the air inlet hoses. If there are any openings in the inlet hoses after the air cleaner element or turbocharger, debris can be sucked in and cause damage both to the engine and the turbocharger. If there are any leaks in the hoses, replace them.
3. Check that there are no air leaks on the pressure side of the turbocharger.
4. Check for exhaust leaks and restrictions at the manifold and turbocharger. Exhaust leaks can usually be detected audibly or by discoloration of the manifold or turbo.
5. Remove the air inlet hose and check the compressor impeller and the housing for wear. Rotate the compressor impeller to make sure it rotates freely. If wear is indicated on the turbocharger housing, remove and replace the unit.
6. Check the oil return line for restrictions or leaks. Repair as necessary.
7. Check for intake or exhaust restrictions. High restrictions in either the intake or exhaust can cause a high vacuum between the compressor impeller and the turbo housing, causing oil to leak by the seals. Remove the air inlet hose and check for oil on the compressor impeller. If oil is found, locate and repair the restriction. If no restriction is found and there is still oil on the compressor impeller, replace the turbocharger.
NOTE: Excessive fuel on the exhaust side of the turbocharger will look like oil leaking by the seals. This condition can come from an over-rich condition caused by a bad air cleaner element, leaking or clogged injector, or a bad oxygen sensor.
8. Check for excessive turbocharger noise. The turbocharger will normally make a "whining" noise that varies in intensity depending upon engine rpm. If there are any "clunking" noises or rattles when the engine is revved up, check for loose turbocharger mounting bolts, intake, or exhaust leaks. Lower pitch noises or rattles at slower engine speeds can indicate debris in the system or that the rotor is contacting the housing.
9. Inspect the wastegate actuator rod assembly. Make sure that the rod moves freely and that none of the components are bent or broken.
10. Check that all of the vacuum lines going to the wastegate solenoid, wastegate servo, and barometric read solenoid are securely attached. Verify that there are no leaking, cracked, split, or melted vacuum hoses in the engine compartment.