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
|
| • | Compare the customer's vehicle with a similar unit. Verify the
customer concern. |
| • | Remove the air filter and check for dirt or a restriction. |
| • | Check the transmission shift pattern and the downshift operation.
Refer to Torque Converter Diagnosis Procedure (4L60E)
or Torque Converter Diagnosis Procedure (4L60E)
in Automatic Transmission. |
|
Fuel System Checks
|
| • | Check for a restricted fuel filter, contaminated fuel, or improper
fuel pressure. Refer to
Fuel System Diagnosis
. |
|
Exhaust System Checks
|
| • | Check the exhaust system for a possible restriction. Refer to Restricted Exhaust
in Engine Exhaust. |
| • | Inspect the exhaust system for damaged or collapsed pipes. Inspect
the muffler for heat distress or a possible internal failure. |
|
Additional Checks
|
| • | Check the control module grounds for being clean, tight, and in
their proper location. |
| • | Check the EGR Valve for being open or partially open all the time. |
| • | Check the torque converter clutch (TCC) operation. Refer to Torque Converter Diagnosis Procedure (4L60E)
or Torque Converter Diagnosis Procedure (4L80E)
in
Automatic Transmission. |
| • | Check the A/C operation. Refer to A/C Compressor
Control Circuit Diagnosis
. |
| • | Check the generator output voltage. Refer to Charging System Check
in Engine Electrical. |
| • | Check the knock sensor (KS) system. |
|
Engine Mechanical Check
| Check the engine for the proper operation
of the following items:
| • | Improper or worn camshaft |
|
