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How to Troubleshoot Mazda Rotary Engines

First released in 1978 and spanning three generations, Mazdas rotary-powered RX-7 grew to become one of the most easily recognizable and sought-after sports cars to come from Japan. Now out of production, the RX-7 is not only enjoyed by enthusiasts, but is also competitive in several classes of racing. With its single-minded philosophy and emphasis on performance, the 13B-REW (the motor designation of the last production model) is able to crank out 255 horsepower, all from a minuscule 1.3-liter twin-rotor Wankel engine bolstered by sequential twin-turbos. The drawback of this design -- and power output -- is the extreme heat and stress to which engine components are subjected, in some cases requiring expensive rebuilds after just 60,000 miles. The engine can be quite finicky to troubleshoot.

Instructions

1

Attach an engine code reader to the Mazdas diagnostic port to quickly identify any faulty components.

2

Tune up the vehicle by installing new filters (oil, air, fuel) and replacing vital engine fluids. Pay special attention to the engine coolant -- which should have no traces of dirt or oil. If you are experiencing any sort of hesitation, rough idle, or inconsistent power delivery, thoroughly inspect and replace any worn ignition components such as the ignition coil, igniter module and spark plugs/wires. This can cure a myriad of symptoms and prevent new ones from developing.

3

Install a new set of silicone vacuum lines (silicone withstands heat better and stays more flexible). The stock lines will often become cracked or brittle due to prolonged exposure to heat, causing erratic boost levels and idle surge.

4

Connect a data-logger unit to your vehicle in order to further investigate engine conditions. The data-logger is able to read values directly from the engine control unit, and displays a list of vital parameters in real time. This will help identify pre-ignition (knock) events, as well as display the various timing and fuel maps under varying engine loads.

5

Attach a multimeter to your battery and alternator to test for correct voltages. Low readings (under 12 volts) indicate a weak system, potentially making the vehicle difficult to start, or even causing a backfire through the exhaust.