Loss of power occurs when the engine fails to produce expected torque. This happens due to airflow restrictions, fuel problems, sensor errors, or mechanical failures.
1. Clogged Fuel Injectors
Restricted injectors = poor atomization = incomplete combustion.
Facts
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10–25% power reduction
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Higher fuel consumption
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Rough acceleration
Common after 80,000–150,000 km depending on fuel quality.
2. Weak Fuel Pump
Low fuel pressure causes the engine to starve during acceleration.
Symptoms
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Hesitation
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Stalling
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Poor high-speed performance
Measured by fuel pressure gauge (psi/bar).
3. Faulty MAF Sensor
Incorrect air measurement = incorrect fuel delivery.
Results
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Power loss
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Check engine light (P0100–P0104)
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Jerking acceleration
4. Clogged Air Filter
A restricted air filter reduces airflow into the engine.
Facts
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Cuts power by up to 15%
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Common in dusty environments
5. Catalytic Converter Blockage
A clogged catalytic converter restricts exhaust flow.
Measured Indicators
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High exhaust backpressure
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Poor acceleration
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Overheating under load
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CEL P0420
6. Turbocharger Failure (Turbo Engines Only)
Turbo boost leaks cause immediate power loss.
Causes
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Loose intercooler hoses
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Wastegate faults
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Turbo seal failure
7. Low Compression (Worn Engine)
Low compression reduces torque output directly.
Measured By
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Compression tester
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Leak-down tester
Occurs in high-mileage engines with worn rings or valves.
Conclusion
Power loss is caused by air, fuel, or exhaust flow restrictions; sensor failure; or worn engine components. Proper diagnostics require fuel pressure tests, airflow data, and compression testing.
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