Engine - High Idle Speed or Hunting with Warm Engine

Category 4
Applicable Model/s 1984 RX-7 (13B)
Subject HIGH IDLE SPEED OR IDLE SPEED HUNTING
Bulletin No. 008/84
Issued 10/15/84
Revised
DESCRIPTION

If you encounter either of the following problems on 1984 RX-7 (13B) vehicles with the engine fully warmed, please follow the repair procedure listed below:

1. Engine speed hunts between approximately 1500-2000 rpm at idle.
2. Engine speed stays approximately 1200-1500 rpm at idle.

Throttle Body:

REPAIR PROCEDURE

1. Throttle Body.

Rotate the secondary throttle valve lever counter-clockwise by hand as shown while the idle speed is high or hunting.

If this procedure corrects the problem, the high idle is due to sticking of the secondary throttle valve. Replace the throttle chamber (N304 20 500B) in this case.

If this procedure does not correct the problem, go to Step 2.

Vent Solenoid Valve:

2. Vent Solenoid Valve.

Disconnect the vacuum hose from the vent solenoid valve and plug the inlet port of the vent solenoid valve with a finger as shown while the idle speed is high or hunting.

Faulty Vent Solenoid Valve:

If this procedure corrects the problem, the high idle is due to a faulty vent solenoid valve. Replace the vacuum switch valve (N304 13 240), which includes the vent solenoid valve, in this case.