What are the common problems with the third generation Mazda RX-7 FD?

The third-generation Mazda RX-7 (FD) is a highly capable car, but its age and the unique nature of the 13B-REW rotary engine mean there are several well-documented issues to watch out for.

Here are the most common problems you will encounter with the FD RX-7:

Engine & Tuning Sensitivities

While the 13B-REW engine is mechanically simple, its main failure points are the apex seals on the rotors and the cooling system O-rings ¹. The engine is highly sensitive to its tune; it does not tolerate pre-detonation ("pinging") or lean air-fuel ratios whatsoever. A lean condition can quickly result in catastrophic engine failure ¹.

Underhood Heat & Turbo System Failures

The sequential twin-turbo system is complex and relies on a network of solenoids and rubber vacuum hoses. The stock exhaust system—specifically the pre-cat unit—retains an incredible amount of heat ¹. These extreme underhood temperatures bake the engine bay and are the primary cause of rubber hose and solenoid failures in the turbo control system ¹.

Electrical & Headlight Issues

Problems with the pop-up headlights or low beams failing to activate are common. This is often caused by damaged wiring hidden within the driver's side front fender liner ³. Because the wiring is obscured, diagnosing this typically requires jacking up the car and removing the driver's side front wheel to properly inspect the harness behind the liner ³.

Accessories & Interior

• Belt Alignment: The power steering and AC compressor belts can suffer from alignment issues, causing the belt to jump a rib or shred. This is often due to the original large accessory bracket warping with age or early casting inconsistencies ⁴.
• Interior Hardware: The glove box opening mechanism is known to come loose or fail, which may require cutting and re-bonding the inner door panel to repair ⁴.

Finally, as these cars are now well over two decades old, the general availability of OEM parts to maintain a "like new" condition is becoming increasingly limited ¹. Applying basic reliability modifications, especially aimed at managing underhood heat, is highly recommended to keep the car running smoothly.