One of the most common causes of blue smoke on hard acceleration is worn piston rings. Piston rings are responsible for sealing the combustion chamber and preventing oil from entering the cylinder. When they become worn or damaged, oil can leak into the combustion chamber and burn along with the fuel, producing blue smoke.
2. Worn valve stem seals:
Valve stem seals are located on the top of the valves and help to prevent oil from entering the combustion chamber. When they become worn or damaged, oil can leak past the seals and into the combustion chamber, causing blue smoke.
3. Turbocharger issues:
If your 240SX is equipped with a turbocharger, it's possible that the turbocharger is the source of the blue smoke. Turbochargers use oil to lubricate their bearings, and if there's a leak in the turbocharger, oil can be drawn into the intake and burned along with the fuel, causing blue smoke.
4. PCV valve problems:
The PCV valve is responsible for regulating the flow of crankcase gases back into the intake manifold. If the PCV valve is clogged or damaged, crankcase gases can build up in the engine and cause blue smoke on hard acceleration.
To diagnose the exact cause of the blue smoke, you will need to perform some diagnostic tests. This may include:
- A compression test
- A leak-down test
- An oil consumption test
- A turbocharger inspection
- A PCV valve inspection
Once you have identified the cause of the blue smoke, you can then take steps to repair or replace the affected parts.
