You are not getting fuel to the engine. Have a fuel pressure test run to see if you are getting fuel which I suspect is your problem. Have you replaced the fuel filter which may be clogged? The fuel pump may have failed. The carburetor may be clogged. It can be many things. You work by eliminating possible causes.
I would have someone stand outside the car and have someone else turn the key on. If you hear the fuel pump pumping then i would replace the fuel filter. This is what i would do:
The fuel filter is on the drivers side of the car near the front of the gas tank behind the rear diff. There are actually quite a few things that certain problem can be. I'll give you a list here, so you can start checking them all out.
1. Are you running 92 octane? This would be better for the engine
2. check fuel filter, see if pump is pumping.
3. Distributor cap, rotor wires, spark plugs. Check the cap and rotor... if there is a lot of pitting on the contacts inside the cap, and the rotor has a lot of residue on it, replace them. (If you replace the rotor, it's likely that the wires need to be replaced as well.) Spark plugs DO NOT USE AUTOLITE PLUGS. USE NGK ONLY. If you take a look at autolites, there is only one prong, where as the stock plugs (NGK) have 4!! It makes a huge difference.
Unless I am mistaken your Mazda RX7 requires 87 octane fuel. Do not under any circumstances use a higher octane fuel that is recommended by Mazda, be it 87, 89, or 91. The higher octane fuel will provide no more power, no better mileage, and in reality will cause hard starting, less mileage, and carbon buildup in a rotary engine. It is a myth that the higher the octane the better.
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