Understanding the Rotary Engine
* Unique Design: The rotary engine's design is different from a piston engine. It has a rotor instead of pistons and uses a complex combustion process.
* Fueling: Rotary engines rely on a precise fuel-to-air ratio. Any imbalances can lead to hesitation.
* Ignition: The ignition system is critical for proper combustion in a rotary. Weak spark or incorrect timing can cause issues.
Potential Causes and Troubleshooting
1. Fuel System
* Fuel Pump Pressure: A weak fuel pump can't deliver enough fuel at high RPM. Test the fuel pump pressure at idle and at high RPM.
* Fuel Filter: A clogged fuel filter restricts fuel flow. Replace it regularly.
* Fuel Injectors: Clogged or worn injectors can cause uneven fuel delivery. Clean or replace them.
* Fuel Pressure Regulator: A faulty regulator can lead to inaccurate fuel pressure.
2. Ignition System
* Spark Plugs: Worn or fouled spark plugs can cause weak ignition. Inspect and replace them as needed.
* Spark Plug Wires: Damaged or cracked wires can cause a poor spark. Inspect and replace any damaged wires.
* Ignition Coil: A failing coil can produce a weak spark. Test the coil.
* Ignition Timing: Incorrect timing can affect combustion. Ensure proper timing with a timing light.
3. Air Intake System
* Air Filter: A dirty air filter restricts airflow, impacting combustion. Replace it.
* Intake Manifold Leaks: Leaks can cause unmetered air to enter the engine, disrupting the air/fuel mixture. Inspect for cracks or loose connections.
4. Exhaust System
* Clogged Catalytic Converter: A blocked catalytic converter can cause backpressure, reducing engine performance. Inspect or replace it.
5. Engine Management System
* Sensors: Faulty sensors (like the Oxygen sensor, Mass Air Flow sensor, or Throttle Position sensor) can provide incorrect readings to the engine computer, leading to hesitation.
6. Rotary Engine Specific
* Apex Seals: Wear in the apex seals (which seal the combustion chamber) can lead to reduced compression and power loss, especially at high RPM.
* Rotor Housing: Cracks or damage to the rotor housing can cause compression loss and lead to hesitation.
Troubleshooting Steps
1. Inspect the Basics: Start by inspecting the obvious: air filter, spark plugs, and fuel filter.
2. Check Codes: If your RX-7 has a Check Engine light, retrieve the diagnostic codes using a code reader. These codes can point you to specific issues.
3. Professional Diagnosis: If you're not comfortable with DIY repairs, take it to a mechanic specializing in rotary engines. They can diagnose the issue more thoroughly.
Remember:
* The rotary engine is complex, and diagnosing problems can be tricky.
* Don't hesitate to consult with a rotary engine specialist for help.
Good luck with your RX-7!
