For 1990-2009 cars

#### Lack Of Power, Sluggishness, Or Sponginess

Checks | Action
--- | ---
DEFINITION: The engine delivers less than expected power. There is little or no increase in speed when partially applying the accelerator pedal.
Preliminary Checks |

• | Refer to Diagnostic System Check - Engine Controls .

• | Refer to Symptoms - Engine Controls .

• | Compare the vehicle with a similar unit in order to determine if the customer has an actual problem.

• | Remove the air filter element and check for dirt or restrictions.

• | Check the transmission shift pattern and down shift operation.

Fuel System Checks |

• | Check for a restricted fuel filter or incorrect fuel pressure.

• | Check the fuel injectors. Perform the Fuel Injector Coil Test Procedure and the Fuel Injector Balance Test Procedure. Refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) and Fuel Injector Balance Test with Special Tool .

• | Check for contaminated fuel.

Ignition System Checks |

• | Check for the proper secondary voltage output with a J 26792 spark tester, or an equivalent. Refer to Electronic Ignition (EI) System Diagnosis .

• | Inspect the spark plugs for correct operation and performance. Refer to Spark Plug Inspection .

Exhaust System Checks |

• | Check the exhaust system for a possible restriction.

• | Inspect the exhaust system for damaged or collapsed pipes. Inspect the muffler for heat distress or a possible internal failure.

Additional Checks |

• | Check the powertrain control module (PCM) grounds for being clean, tight, and in their proper locations. Refer to

#### Power and Ground

Engine Controls Components
MIL and DLC
Handling ESD Sensitive Parts Notice
H/L, HTR, IG and LAMP Fuses
HAZ, D/L, TAIL, STOP and DOME Fuses
BATT, ABS, FI and ACC Fuses
BATT, ABS, FI and ACC Fuses
Handling ESD Sensitive Parts Notice
G100, G101 and G102
.

• | Check the exhaust gas recirculation (EGR) valve for excessive flow or sticking open. Refer to Exhaust Gas Recirculation (EGR) System Diagnosis .

• | Check the generator output voltage.

Engine Mechanical Check |

• | Check for any of the following engine mechanical problems:

- | Low compression

- | Incorrect valve timing

- | Incorrect or worn camshaft

• | Refer to Engine Compression Test in Engine Mechanical.