Fuel System - Poor Idle or Stall When Coming to A Stop
Category 4Applicable Model/s 1984-85 RX-7 (13B)
Subject IDLE SPEED ADJUSTMENT
Bulletin No. 009/84
Issued 10/26/84
Revised
DESCRIPTION
Improper adjustment of the idle speed may cause poor idle stability or engine stall when coming to a stop. If either of these problems are encountered, please follow the Checking Procedure listed below.
Figure 1:
CHECKING PROCEDURE
1. Warm up the engine to the normal operating temperature. Confirm that the fast idle cam separates from the roller as shown. If the fast idle cam is contacting the roller, the engine is not fully warmed. (Figure 1)
2. Stop the engine and turn the key to the "ON" position.
Figure 2:
3. Connect the volt meter to the throttle sensor checking connector (Green) and check the voltage as shown.. (Figure 2)
(a) Terminal (A) - approximately 12V & Terminal (B) - 0V:
Throttle sensor adjustment is OK. Go to Step 4.
(b) Terminal (A)- approximately 12v & Terminal (B)- approximately 12v:
Throttle sensor out of adjustment. Adjust as follows:
Turn the adjust screw counterclockwise until the voltage at terminal (B) becomes 0. Then turn the adjust screw an additional 1/4 to 1/2 turn counter-clockwise. Confirm that the voltages at terminals (A) and
(B) are as shown in Step 3 (a).
(c) Terminal (A)- 0v & Terminal (B)- 0v:
Throttle sensor out of adjustment. Adjust as follows:
Figure 3:
Turn the adjust screw clockwise until the voltage at terminal (A) becomes approximately 12v. Then turn the adjust screw an additional 1/4 to 1/2 turn clockwise. Confirm that the voltages at terminals (A) and (B) are as shown in Step 3 (a). (Figure 3)
4. Start the engine and run it at idle.
Figure 4:
5. Disconnect the connector for the vent and vacuum solenoid valves. Turn all accessories off. (Figure 4)
Figure 5:
6. Check the idle speed. Adjust the idle speed to specification, if necessary, by turning the air adjust screw. (Figure 5)
Idle speed: 800 rpm
Figure 6:
7. Use a jumper wire to ground the LW wire for the air supply valve as shown. Confirm that the engine speed increases to 1000 - 1070 rpm. (Figure 6)
NOTE: Step 7 must be done with the connector for vent and vacuum solenoid valves disconnected.
Figure 7:
Adjust the engine speed to specification, if necessary, by turning the air-supply valve adjust screw as shown. (Figure 7)
8. Reconnect the vent and vacuum solenoid valve connectors disconnected in Step 5.