1983 Mazda RX-7 GSL Testing Engine Compression
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Engine compression the manufacturer recommends using a special compression tester (49 0820 280k). Compression testers for piston engines will read only the highest pressure of the 3 combustion chambers in the rotor housing. High tension wire resistance carefully remove high tension wires from spark plugs and distributor cap. Using an ohmmeter, measure resistance of wires while gently twisting wires. If resistance is not to specifications, or fluctuates from infinity to any value, replace high tension wire(s). High tension wire resistance adjustments distributor all models are equipped with mitsubishI electronic ignition with 2 pick-up coils. Air gap is non-adjustable. Ignition timing note: on vehicles equipped with automatic transmission, place selector lever in “d” position and block the wheels. 1. Warm engine to normal operating temperature. Connect a tachometer, then connect timing light to leading (lower) spark plug of front rotor. Start engine and run at idle speed. 2. Check ignition timing and rotate distributor to correct if necessary. Tighten distributor lock nut and recheck timing. 3. Connect timing light to trailing (upper) plug of front rotor. Start engine and check timing. If not correct, loosen vacuum unit attaching screws. Move vacuum unit in or out to adjust trailing timing. Remove test equipment.
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Engine compression the manufacturer recommends using a special compression tester (49 0820 280k). Compression testers for piston engines will read only the highest pressure of the 3 combustion chambers in the rotor housing. High tension wire resistance carefully remove high tension wires from spark plugs and distributor cap. Using an ohmmeter, measure resistance of wires while gently twisting wires. If resistance is not to specifications, or fluctuates from infinity to any value, replace high tension wire(s). High tension wire resistance adjustments distributor all models are equipped with mitsubishI electronic ignition with 2 pick-up coils. Air gap is non-adjustable. Ignition timing note: on vehicles equipped with automatic transmission, place selector lever in “d” position and block the wheels. 1. Warm engine to normal operating temperature. Connect a tachometer, then connect timing light to leading (lower) spark plug of front rotor. Start engine and run at idle speed. 2. Check ignition timing and rotate distributor to correct if necessary. Tighten distributor lock nut and recheck timing. 3. Connect timing light to trailing (upper) plug of front rotor. Start engine and check timing. If not correct, loosen vacuum unit attaching screws. Move vacuum unit in or out to adjust trailing timing. Remove test equipment.
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