Probable Causes
- Dirty air cleaner element.
- Plugged crankcase breathers.
- Air cleaner element missing, leaking, not sealing correctly or loose connections to turbocharger.
- Collapsed or restricted air tube to turbocharger.
- Restricted or damaged crossover pipe from turbocharger to the inlet manifold.
- Foreign object between turbocharger and air cleaner.
- Foreign object in exhaust system (restricted exhaust).
- Loose turbocharger clamps or bolts.
- Inlet manifold cracked or gaskets loose, damaged or missing.
- Cracked exhaust manifold or gaskets loose, damaged or missing.
- Restricted exhaust system.
- Oil delay to turbocharger on start-up.
- Insufficient lubrication.
- Lubrication oil contaminated with dirt or other material.
- Improper lubrication oil being used.
- Restricted oil feed line.
- Restricted oil drain line.
- Turbine housing damaged or restricted.
- Turbocharger seal leaking.
- Worn journal bearings.
- Excessive dirt buildup in compressor housing.
- Excessive carbon buildup behind turbine wheel.
- Excessive acceleration on initial start (lubrication lag time).
- Too little warm-up time allowed.
- Fuel pump malfunction.
- Worn or damaged injectors.
- Improper valve timing.
- Burned valves.
- Worn piston rings.
- Burned pistons.
- Leaking oil feed line.
- Excessive engine pre-oil.
- Excessive engine idling.
- Coked or sludged center housing.
- Oil pump malfunction.
- Oil filter plugged.