Sensor/System
Symptoms
| Sensor/System
|
Find the symptom in the left column and perform the test/inspection procedure in the right column, be sure to review each cell of the table to identify all tests for a symptom.
|
| • | Hesitation, Sag, Stumble |
| • | Rough, Unstable, or Incorrect Idle and Stalling |
|
| • | Inspect the mass air flow (MAF) sensor for proper installation, obstruction, contamination, and damage. |
| • | Inspect the MAF Sensor for proper seating of the connector and terminals. |
| • | Inspect the manifold absolute pressure (MAP) sensor for proper installation, obstruction, and damage. |
| • | Ensure the quality of the MAP Sensor vacuum source. |
|
| • | Hesitation, Sag, Stumble |
| • | Rough, Unstable, or Incorrect Idle and Stalling |
|
| • | Inspect for vacuum leaks and other unmetered air. |
|
| • | Lack of Power, Sluggishness, or Sponginess |
| Monitor the Knock Sensor (KS) System for excessive spark retard activity. Refer to the Knock Sensor description within in the
Electronic Ignition (EI) System Description
.
|
Hesitation, Sag, Stumble
| Inspect the accelerator pedal position (APP) sensor and the related wiring.
Inspect the Throttle Actuator Control (TAC) System for proper operation.
|
| • | Lack of Power, Sluggishness, or Sponginess |
| • | Hesitation, Sag, Stumble |
| • | Rough, Unstable, or Incorrect Idle and Stalling |
| Inspect for contaminated oxygen sensor (O2S).
|
Poor Fuel Economy
| Inspect for proper operation of the speedometer.
|
