ADJUSTMENTS

Throttle Positioner

1. Disconnect the wiring from the coasting valve solenoid, and connect the solenoid directly to the car battery.
2. Loosen the locknut on the solenoid adjuster.
3. Rotate the adjuster until an idle speed of 900–1,000 rpm is obtained after releasing the throttle from an engine speed of 2,000 rpm.
4. Tighten the locknut carefully once the proper idle speed has been obtained.
5. Disconnect the jumper wires from the battery, then reattach the coasting valve solenoid's electrical connector.

   NOTE: As soon as the solenoid is disconnected from the battery, idle speed should drop to 800 rpm.

Idle Switch

1. Warm up the engine until the water temperature is at least 159°F (71°C).
2. Make sure that the mixture and idle speed are adjusted properly.
3. Adjust the idle speed to 1,075–1,100 rpm (manual transmission) or 1,200–1,300 rpm (automatic transmission), by rotating the throttle adjusting screw.
4. Rotate the idle switch adjusting screw until the switch changes from the OFF to ON position.
5. Slowly turn the idle switch adjusting screw back to the point where the switch just changes from ON to OFF.
6. Turn the throttle screw back so that the engine returns to normal idle.

   NOTE: Be sure that the idle switch turns ON when the idle speed is still above 1,000 rpm.

Dashpot

1986–89 NON-TURBO RX-7

1. Start the engine and allow it to warm up to normal operating temperature at idle speed.
2. Connect a tachometer to the engine and increase the engine speed to 3,000 rpm.
3. Slowly decrease the engine speed and verify that the dashpot actuating rod makes contact with the throttle lever at 2,700–3,100 rpm.
4. To adjust the dashpot, loosen the locknut and rotate the dashpot body clockwise or counterclockwise until the rod makes contact with the lever at the specified rpm.

1986–89 RX-7 TURBO

1. Drain the cooling system and remove the intercooler.
2. Detach the throttle sensor connector.

   Fig. 1: Checking dashpot resistance — 1986–89 RX-7 turbo

3. Attach an ohmmeter to terminals A and B of the throttle sensor connector, as shown in the illustration. Set the meter to the 1000x scale.
4. Manually separate the dashpot actuating rod from the throttle lever and observe the reading on the meter. As the rod and lever separate, the resistance should be 1.8–3.8 kilohms. If the reading is not as specified, adjust by loosening the locknut on top of the dashpot and rotating the dashpot body either clockwise or counterclockwise, until the proper resistance is obtained. Once the adjustment is complete, tighten the locknut.