Checks
| Action
|
DEFINITION: The engine has a power variation under a steady throttle or cruise.
The vehicle feels as if speeds up and slows down with no movement of the accelerator
pedal.
|
Preliminary Checks
|
| • | Ensure the vehicle operator understands the transmissions torque converter
clutch (TCC) operation, if equipped. |
| • | Ensure the vehicle operator understands the A/C compressor clutch operation,
if equipped. |
|
Sensor Checks
|
| • | Test for proper operation of the vehicle speed sensor (VSS). |
| • | Test for proper operation and performance of the oxygen sensor. |
|
Fuel System Checks
|
| • | Inspect for a lean or rich engine condition. |
| | Using a scan
tool observe the oxygen sensor output while operating the vehicle under the symptom
condition. |
| • | Inspect for proper operation of the CNG fuel injectors. Refer to: |
| • | Ensure that the manual shut-off valve is fully open. |
|
