Lack of Power, Sluggish or Spongy Symptom
Step
| Action
| Value(s)
| Yes
| No
|
DEFINITION: The engine delivers less than the expected
power. There is little or no increase in the speed when the accelerator
pedal is pushed down part way.
|
1
| Did
you perform the On-Board Diagnostic (OBD) System Check?
| --
|
Go to Step 2
| Go to the
Powertrain On Board Diagnostic (OBD) System Check
|
2
|
- Perform a bulletin search.
- If a bulletin that addresses the symptom is present, correct the
condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
| --
|
Go to Step 17
|
Go to Step 3
|
3
| Did you perform a visual/physical
check?
| --
|
Go to Step
4
| Go to
Symptoms
for the Visual /Physical Check
|
4
|
- Remove and check the air filter element for dirt or for a restriction.
- Replace the air filter element if necessary.
Was a repair required?
| --
|
Go to Step 16
|
Go to Step 5
|
5
| Check the intake plenum switchover valve and the intake resonance switchover
valve for proper operation. Refer to
DTC P1112 Intake Plenum Switchover Solenoid Control Circuit
and
DTC P1113 Intake Resonance Switchover Solenoid Control Circuit
.
Was a problem found and corrected?
| --
|
Go to Step 16
|
Go to Step 6
|
6
|
- Check the fuel pressure. Refer to
Fuel System Diagnosis
.
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 7
|
7
|
- Check for water or alcohol contaminated fuel using a J 39383-A,
gasoline test kit.
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 8
|
8
|
- Use a scan tool in order to monitor the knock retard for excessive
spark retard activity.
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 9
|
9
|
- Remove the spark plugs. Check for the following conditions:
• | Carbon tracking on the insulator |
Notice: Determine the cause of the oil or gas fouled spark plugs in order to
avoid damage to the new spark plugs.
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 10
|
10
|
- Check the ignition coils for cracks or carbon tracking.
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 11
|
11
|
- Check the ECM grounds for being clean, tight and in the proper
locations.
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 12
|
12
|
- Check the exhaust system for a possible restriction:
• | Inspect the exhaust system for any damaged or collapsed pipes. |
• | Inspect the muffler for heat distress or a possible internal failure. |
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 13
|
13
|
- Check the torque converter clutch (TCC) for a proper operation.
Refer to
Torque Converter Diagnosis
.
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 14
|
14
|
- Check for the following Engine Mechanical problems. Refer to Engine
Mechanical:
• | A hydraulic valve lifter problem |
• | Leaking cylinder head gaskets |
• | Worn or incorrect camshaft |
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 15
|
15
|
- Review all of the diagnostic procedures within this table.
- When all of the procedures have been completed and no malfunctions
are present, review/inspect the following items:
• | All of the connections within a suspected circuit and/or system |
- If a problem is present, repair as necessary.
Was a problem found?
| --
|
Go to Step 16
|
Go to Step 3
|
16
| Operate the vehicle under the same conditions (as closely as possible)
as when the original symptom occurred.
Is the original symptom still present?
| --
|
Go to Step 3
|
Go to Step 17
|
17
| Are any other driveability symptoms still present?
| --
| Go to
Symptoms
| System OK
|