1. Coolant Leak:
- Check for a coolant leak. A blown head gasket or cracked cylinder head can allow coolant to enter the combustion chamber, resulting in white smoke. Look for low coolant levels, a milky appearance to the oil, and a sweet odor coming from the exhaust.
2. Oil Burning:
- Blue smoke is a sign of burning oil rather than white smoke. Check the oil level and look for any external leaks. Worn piston rings or valve stem seals can cause oil to enter the combustion chamber. This often accompanied by a drop in oil pressure.
3. Condensation:
- In cold weather, white smoke from the exhaust is normal during warm-up. This is just condensation evaporating from the exhaust system. The smoke should disappear once the engine reaches its operating temperature.
4. Faulty Fuel System:
- If the fuel injection system is malfunctioning, it can cause the engine to run rich and produce white smoke. Check for faulty fuel injectors, a clogged fuel filter, or a malfunctioning oxygen sensor.
5. Overheating:
- If your RX-7 is overheating, the head gasket could be warped or blown. This can cause coolant to leak into the combustion chamber, leading to white smoke and possible engine damage.
6. Turbocharger (if equipped):
- A failed or leaking turbocharger can suck oil into the intake system and cause white smoke. Check the turbocharger for any signs of damage, such as oil leaks or excessive play.
7. Worn Rotary Engine Seals:
- In rotary engines, worn seals can lead to combustion gases leaking into the side chambers and combining with oil, resulting in white smoke.
It's recommended to have your RX-7 inspected by a qualified mechanic to identify the exact cause of the white smoke and perform necessary repairs.
