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Probable Causes

WARNING: This page does not describe the selected car, but rather 34 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clogged air filter element.
  2. Obstructed air intake duct to turbo compressor.
  3. Obstructed air outlet duct from compressor to intake manifold.
  4. Obstructed intake manifold.
  5. Air leak in duct from air cleaner to compressor.
  6. Air leak in duct from compressor to intake manifold.
  7. Air leak at intake manifold-to-engine joint.
  8. Obstruction in exhaust manifold.
  9. Obstruction in exhaust system.
  10. Gas leak in exhaust manifold-to-engine joint.
  11. Gas leak in turbine inlet-to-exhaust manifold joint.
  12. Gas leak in ducts after turbine outlet.
  13. Obstructed turbocharger oil drain line.
  14. Obstructed engine crankcase ventilation.
  15. Turbocharger center housing sludged or coked.
  16. Engine camshaft timing incorrect.
  17. Worn engine piston rings or liners (blow-by).
  18. Internal engine problems (valves or pistons).
  19. Dirt caked on compressor wheel and/or diffuser vanes.
  20. Damaged turbocharger.
  21. Wastegate stuck open.
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