Lack of Power, Sluggishness or Sponginess (LTG)
WARNING: This page is about a different variant/trim than selected.
- Inspect the engine electrical system for incorrect operation. Refer to Symptoms - Engine Electrical .
- Verify that each injector harness is connected to the correct injector.
- Inspect the mass air flow (MAF) sensor for obstruction, contamination and damage. Refer to Mass Airflow Sensor with Intake Air Temperature Sensor Replacement .
- Engine warm and idling, verify the correct operation of the camshaft actuator system. Command the intake and exhaust camshaft actuators from 0 degrees to 20 degrees and back to zero while observing the scan tool Intake Camshaft Position Variance and Exhaust Camshaft Position Variance parameters. Each parameter should be less than 2 degrees in each of the commanded states.NOTE: The following actions may need to be repeated in order to verify an intermittent intake or exhaust camshaft actuator condition.
- If any of the parameters is greater than 2 degrees, inspect the suspect camshaft actuator and camshaft actuator solenoid valve and valve bore for contamination, obstruction and damage. Refer to Camshaft Position Actuator Exhaust Solenoid Valve Replacement , Camshaft Position Actuator Intake Solenoid Valve Replacement and Camshaft Actuator System Description .
- Verify the correct operation of the turbocharger system. Perform the following:
- Inspect the turbocharger moving components for looseness, binding, wear and damage.
- Verify that the turbocharger air inlet ducts and outlet ducts are tightly sealed and that the air passages are not obstructed. Engine running, use a solution of dish soap and water in a spray bottle to pinpoint any air leaks.
- Inspect the turbocharger system for external fluid leaks. Inspect the gaskets and sealing surfaces and look for cracks in the turbocharger components. Refer to Turbocharger Leaking Fluids Externally and Turbocharger Smoke or Smell .
- Inspect for excessive turbocharger system noise. Refer to Turbocharger Noise .
- Inspect for a loss of turbocharger pressure. Refer to Turbocharger Loss of Boost Pressure .
- For additional information, refer to Turbocharger System Description and Turbocharger Cleaning and Inspection .