GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2006 🢒 DTS 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 Cuts Out, Misses

Inspection/Test

Action

DEFINITION: Steady pulsation or jerking that follows engine speed, usually more pronounced as the engine load increases.

Sensor/System
    • Verify that the engine coolant temperature (ECT) sensor is not shifted in value. Refer to Temperature Versus Resistance .
    • Inspect the mass air flow (MAF) sensor for proper installation, obstruction, contamination, and damage. Refer to Mass Airflow Sensor/Intake Air Temperature Sensor Replacement .
    • Inspect the manifold absolute pressure (MAP) sensor for proper installation, obstruction, contamination, and damage. Refer to Manifold Absolute Pressure Sensor Replacement .
    • Inspect the MAF and MAP sensors for proper seating of the connectors and terminals.
    • Ensure the quality of the MAP sensor vacuum source.
    • Inspect for the proper operation of the exhaust gas recirculation (EGR) system. Refer to Exhaust Gas Recirculation (EGR) System Description .
    • Inspect for vacuum leaks and other unmetered air.
    • Inspect the crankshaft position (CKP) sensor for damage and proper installation. Refer to Crankshaft Position Sensor Replacement .
    • Inspect for contaminated heated oxygen sensors (HO2S).

Fuel System
    •  Test the fuel system for correct operation, restriction, volume, and pressure. Refer to Fuel System Diagnosis .
    • Test for proper operation of the fuel injectors. Refer to Fuel Injector Diagnosis .
    • Test for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Inspect the throttle body for coking. Refer to Throttle Body Inspection and Cleaning .
    • Inspect for lean or rich conditions. Refer to DTC P0171, P0172, P0174 or P0175 Conditions for Running the DTC. Refer to DTC P0171 or P0172 or DTC P0174 or P0175 .

Ignition System
    • Inspect for proper ignition system operation. Refer to Electronic Ignition (EI) System Diagnosis .
    • Inspect the spark plugs. Refer to Spark Plug Inspection .
    • Inspect the spark plugs for correct application. Refer to Ignition System Specifications .
    • Inspect for damaged ignition coils within the ignition coil module assemblies.
    • Inspect for damaged or misaligned spark plug boots.
    • Inspect the CKP sensor for damage and proper installation. Refer to Crankshaft Position Sensor Replacement .
    • Inspect the CKP sensor and harness for electromagnetic interference (EMI).

Additional Inspections
    • Inspect for a restricted air intake system.
    • Inspect for a dirty or restricted air filter.
    • Inspect the engine mechanical for oil consumption, correct engine compression and correct base engine timing. Refer to Symptoms - Engine Mechanical .
    • Inspect the engine electrical system for correct operation. Refer to Symptoms - Engine Electrical .
    • Inspect the engine cooling system. Refer to Symptoms - Engine Cooling .
    • Inspect the engine exhaust. Refer to Symptoms - Engine Exhaust .
    • Inspect the engine mounts. Refer to Engine Mount Inspection .
    • Inspect the heating, ventilation, air conditioning (HVAC) system operation. Refer to Symptoms - HVAC Systems - Automatic and Air Conditioning (A/C) System Performance Test .
    • Inspect the transmission for proper shifting and torque converter control (TCC) engagement. Refer to Symptoms - Automatic Transmission .
    • An engine miss condition can be caused by electromagnetic interference (EMI). EMI can usually be detected by monitoring the engine RPM with a scan tool. A sudden increase in RPM with little change in the actual engine RPM indicates EMI is present.