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Why did car lose all power when engine was still running?

Loss of power while the engine is still running can be caused by several reasons:

1. Fuel System Issues:

- Fuel pump failure: If the fuel pump fails or is not providing enough fuel pressure, the engine will lose power.

- Fuel filter blockage: A clogged fuel filter can restrict the flow of fuel to the engine, causing power loss.

2. Air System Issues:

- Air filter blockage: A dirty or clogged air filter can restrict airflow to the engine, reducing its power output.

- Air leakage: Leaks in the air intake system, such as a cracked hose, can cause unmetered air to enter the engine, disrupting the air-fuel mixture and leading to power loss.

3. Spark Plug Issues:

- Fouled spark plugs: Worn or fouled spark plugs can lead to weak or intermittent ignition, resulting in power loss.

4. Electrical System Issues:

- Battery issues: A weak or failing battery may not provide enough electrical power to the engine's ignition system, causing power loss.

- Alternator failure: A faulty alternator may not generate enough electricity to power the engine's electrical components and ignition system.

5. Transmission Issues:

- Clutch issues: In vehicles with manual transmission, a worn or slipping clutch can cause power loss by preventing the engine's power from being effectively transmitted to the wheels.

- Transmission fluid issues: Low or old transmission fluid can lead to internal transmission problems and power loss.

6. Engine Issues:

- Mechanical problems: More severe issues like engine component failures, timing belt issues, or camshaft problems can cause the engine to lose power even while it's still running.

Identifying the exact cause of the power loss requires proper diagnostics by a qualified mechanic. Troubleshooting and inspection steps may include checking fuel pressure, airflow, spark plug condition, electrical system components, and performing visual inspections and computer diagnostic scans to pinpoint the specific problem.