Lack of Power, Sluggishness, or Sponginess. Cadillac Seville 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 Lack of Power, Sluggishness, or Sponginess

Checks

Action

DEFINITION: Engine delivers less than expected power. Little or no increase in speed when the accelerator pedal is pushed down part way.

Preliminary

•	Refer to Important Preliminary Checks Before Starting in Symptoms .

•	Search for bulletins.

Sensor/System

•	Check the knock system (KS) for excessive spark retard.

•	Check the EGR system for proper operation.

•	Check for a dirty or damaged air cleaner element.

•	Check for collapsed, or damaged intake air ducting.

Fuel System

•	Check the fuel pressure. Refer to Fuel System Pressure Test .

•	Check the fuel injectors. Refer to the following:

-	Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) .

-	Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F) .

•	Check for items that cause the engine to run rich, or lean.

•	Check for contaminated fuel. Refer to Fuel Quality Diagnosis .

Ignition System

•	Check for proper connections at each ignition module assembly.

•	Check for proper ignition voltage output using the spark tester J 26792.

•	Check the ignition coils for cracks or damage.

•	Check for a missing or damaged ignition module assembly grounding spring.

•	Check for damaged or misaligned spark plug boots.

Important: If the spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs.

•	Check for the spark plugs for the following:

Fouling

Cracks

Wear

-	Incorrect heat range or reach

-	Incorrect gap

-	Burned or damaged electrodes

Engine Mechanical

•	Check for excessive oil in the combustion chamber-leaking valve seals.

•	Check for low cylinder compression. Refer to Engine Compression Test in Engine Mechanical.

•	Check for incorrect basic engine parts. Inspect the following:

Camshafts

-	Cylinder heads

-	Pistons, etc.

Automatic Transaxle

Check for proper operation of the transmission fluid pressure (TFP) manual valve switch. Refer to Transmission Fluid Pressure Manual Valve Position Switch Circuit Diagnosis in Automatic Transaxle 4T80-E.

Additional Checks

•	Check the exhaust system for possible restrictions.

•	Check for proper torque converter clutch (TCC) operation. Refer to Torque Converter Diagnosis in Automatic Transaxle.

•	Check for conditions that cause the engine torque management system to reduce engine power.