Inspection/Test
| Action
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DEFINITION: Engine delivers less than expected power. Little or no increase
in speed when the accelerator pedal is pushed down part way.
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Preliminary
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Sensor/System
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• | Inspect the knock system (KS) for excessive spark retard. |
• | Inspect the exhaust gas recirculation (EGR) system for proper operation. |
• | Inspect for a dirty or damaged air cleaner element. |
• | Inspect for collapsed, or damaged intake air ducting. |
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Fuel System
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• | Test the fuel injectors. Refer to the following: |
Inspect the following that may cause the engine to run rich:
Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section. • | Any water intrusion in the heated oxygen sensor (HO2S) connector |
• | Engine oil contaminated by fuel |
• | An evaporative emission (EVAP) canister purge condition |
• | A leaking fuel pressure regulator |
• | Inaccurate mass air flow (MAF) sensor |
• | Blockage on the inlet screen of the MAF sensor |
• | Vacuum hoses for splits, kinks and proper connections |
• | The air intake duct for being collapsed or restricted |
Inspect the following that may cause the engine to run lean:
Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section. • | Any water intrusion into the HO2S connector |
• | An exhaust leak between the HO2S and the engine--Refer to
Exhaust Leakage
in Engine Exhaust. |
• | An inaccurate MAF sensor |
• | Vacuum hoses for splits, kinks and proper connections |
|
Ignition System
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• | Inspect for proper connections at each ignition module assembly. |
• | Test for proper ignition voltage output using the J 26792
Spark Tester . |
• | Inspect the ignition coils for cracks or damage. |
• | Inspect for a missing or damaged ignition module assembly grounding spring. |
• | Inspect for damaged or misaligned spark plug boots. |
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Engine Mechanical
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• | Inspect for excessive oil in the combustion chamber-leaking valve seals.
Refer to
Oil Consumption Diagnosis
in Engine
Mechanical - 4.6L. |
• | Inspect for incorrect basic engine parts. Inspect the following: |
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Additional
|
• | Inspect for proper torque converter clutch (TCC) operation. Refer to
Torque Converter Diagnosis
in Automatic Transaxle -
4T80-E. |
• | Inspect for conditions that cause the engine torque management system
to reduce engine power. |
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