If the ABS light is on intermittently, it may be due to a loose ABS ring on the rear axle. If a loose ABS ring is found during inspection, replacement of the ABS ring and affected drive axle may be necessary.
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Repairpal verified 1993 Mazda RX-7 problems
If the engine intermittently does not start and is cranking OK, it may be the main relay is defective. The main relay can corrode and fail, requiring replacement.