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What cause the car to smoke beneath hood?

1. Oil Leak:

* Check for any leaks around the engine, especially around the oil filter, oil pan, and valve cover gasket.

* Low oil level can also cause the engine to overheat, leading to smoke.

2. Coolant Leak:

* Check the coolant level in the reservoir.

* Look for leaks around the radiator, hoses, and water pump.

* Coolant leaks can cause the engine to overheat and smoke.

3. Blown Head Gasket:

* A blown head gasket can cause the engine to overheat, leading to smoke.

* Check for coolant in the oil or oil in the coolant.

* A blown head gasket can also cause the car to lose power and run rough.

4. Worn Piston Rings:

* Worn piston rings can allow oil to seep into the combustion chamber, causing the car to smoke.

* This is a common problem in older cars with high mileage.

5. Faulty PCV Valve:

* A faulty PCV valve can cause the engine to smoke, especially when idling.

* The PCV valve helps control crankcase pressure and can become clogged or stuck over time.

6. Turbocharger or Supercharger Problems:

* If your car has a turbocharger or supercharger, problems with these components can also cause smoke.

* Look for leaks around the turbocharger or supercharger, and listen for unusual noises.

7. Electrical Issues:

* Electrical issues, such as a short circuit or malfunctioning sensor, can also cause smoke.

* Look for any damaged or loose wires, and have the electrical system checked by a qualified mechanic.