Genuine Pontiac Grand Prix Turbocharger

Pontiac Grand Prix Turbocharger Parts Questions & Experts Answers

• Supercharger Kit,Engine
  89060470
  Q: How to visually inspect and troubleshoot a turbocharger on Pontiac Grand Prix?

  A: Every turbocharger has its own noise level when operating. If the noise level changes, suspect a problem. If the sound of the turbocharger goes up and down in pitch, check for heavy dirt buildup in the compressor housing and on the compressor wheel, or for an air inlet restriction. If the noise level is a high pitch or whistling sound, look for an inlet air or exhaust gas leak. With the engine off and the turbocharger stopped, make a visual inspection of the turbocharger and components. Check for loose duct connections from the air cleaner to the turbocharger. Be sure the cross-over duct from the turbocharger to intake system is not loose. Visually check the wheels of the turbocharger for damage from foreign objects. Look for evidence of wheel-to-housing contact. Be sure the shaft rotates freely. Rotating stiffness could indicate the presence of sludged oil or coking (hardened oil deposits) from overheating. Push in on one of the shaft wheels while turning it. Be sure the wheels turn freely without contacting the housings, the backplate or the shroud. Be sure the exhaust manifold has no loose connections or cracks. Check the oil drain line for any restrictions. Visually inspect the actuator and wasteate linkage for damage. Check the hose from the throttle bodyto wastegate solenoid and from the wastegate solenoid to actuator assembly. Using a pump, apply 3.5 to 4.5 psi to the actuator assembly. The actuator rod end should move 1/64 inch to actuate the wastegate linkage. If not, replace the actuator assembly and recheck. Remove test equipment and reconnect the hose.