Surges and/or Chuggles Symptom
Checks
| Action
|
DEFINITION: The engine has a power variation under a steady throttle
or cruise. The vehicle feels as if it speeds up and slows down with no change
in the accelerator pedal.
|
Preliminary Checks
|
| • | Refer to
Symptoms
for the
Important Preliminary Checks. |
| • | Make sure the driver understands the A/C compressor operation. |
| • | Use the scan tool in order to make sure the reading of VSS matches
vehicle speedometer. This excludes vehicles with electronic transmissions
where some variation between VSS and the speedometer is normal. Refer to
the Diagnostic Aids in
DTC 24 VSS Circuit Low
. |
|
Sensor Check
| Check the Oxygen Sensor (O2S) performance. Refer to
DTC 44 Lean Exhaust Indicated
and
DTC 45 Rich Exhaust Indicated
.
|
Fuel System Checks
|
| • | Determine if a Rich or a Lean system causes the condition. Drive
the vehicle at the speed of the complaint. Monitoring the Fuel Trim will help
identify the problem. |
|
Ignition System Checks
|
| • | Check for the proper ignition voltage output using the spark tester J 26792
or equivalent. |
| • | Check the spark plugs. Remove the spark plugs. Inspect the plugs
for the following: |
|
Additional Checks
|
| • | Check the ECM grounds for being clean, tight, and in their proper
locations. |
| • | Check the generator output voltage. |
|
