For 1990-2009 cars

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 Powertrain On Board Diagnostic (OBD) System Check .

• | Refer to Symptoms .

• | Compare the customer's vehicle with a similar vehicle in order to determine the severity of the customer's concern.

• | 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. Check for the correct fuel pressure. Refer to DTC P0106 Manifold Absolute Pressure (MAP) System Performance .

• | Check for contaminated fuel or inferior quality fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

Ignition System Checks |

• | Check for adequate secondary ignition voltage with a J 26792 spark tester or an equivalent.

• | Check for the proper operation of the ignition control system. Check the ignition timing. Refer to Ignition Timing Adjustment .

Exhaust System Checks |

• | Inspect the exhaust system for damaged or collapsed pipes.

• | Check the exhaust system for a possible internal restriction. Refer to Restricted Exhaust System Check .

Additional Checks |

• | Check the PCM grounds for being clean, tight, and in the proper location. Refer to

#### PCM Power and Ground

.

• | Check the 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 Mechanical.