Inspection/Tests
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DEFINITION: Momentary lack of response as the accelerator is pushed down. Can occur at any vehicle speed. Usually more pronounced when first trying to make the vehicle move from a stop. May cause the engine to stall if severe enough.
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Preliminary
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Sensor/System
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Notice: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in the Preface section.
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Fuel System
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• | Inspect for the following that may cause the engine to run rich: |
Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section. - | Water intrusion in the HO2S connector |
- | Purging of a saturated EVAP canister |
- | Vacuum hoses that are split, kinked, or improperly connected |
- | An air intake duct that is collapsed or restricted. |
• | Inspect for the following conditions that may cause the engine to run lean: |
Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section. - | Water intrusion in the HO2S connector |
- | An exhaust leak between the HO2S and the engine--Refer to
Exhaust Leakage in Engine Exhaust. |
- | Vacuum hoses that are split, kinked, or improperly connected |
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Ignition System
| In order to properly inspect the spark plugs or to correct a condition, refer to the following procedures:
• | Inspect for proper secondary ignition voltage output with
J 26792 (SA9199Z) Spark Tester. |
• | An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gage gap tool. |
• | If the spark plugs are found to be fouled, determine the cause before replacing the spark plugs. |
• | Inspect for damaged or misaligned spark plug boots. |
• | Inspect the electronic ignition (EI ) module for a proper ground connection. |
• | Monitor the Misfire Current Counters while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use the DTC P0300 table for diagnosis. Refer to
DTC P0300 . |
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Engine Cooling System
| Inspect the engine thermostat for proper operation and for correct heat range. Refer to
Thermostat Diagnosis in Engine Cooling.
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