Idle Speed: Navajo

Ensure the following conditions exist: throttle bore, throttle plate and Idle Speed Control (ISC) air by-pass valve are free of contamination, oxygen sensor is free of contamination and is operating, throttle stop lever is resting against throttle stop screw, no vacuum leaks are present, cooling system is full and ignition timing is set to specification.
Perform a thorough basic inspection and self-test (KOEO, KOER and Continuous Memory) to confirm operation of sub-systems which may contribute to idle speed control problems. See appropriate TESTS W/CODES article.
With engine off, disconnect negative battery cable for at least 5 minutes. Connect negative battery cable. Start engine and allow idle speed to stabilize for 2 minutes. Snap throttle open and return to idle. Lightly press and release accelerator. Turn engine off. Disconnect ISC air by-pass solenoid.
NOTE: If engine RPM fluctuates during idle, throttle plate may be open enough to allow canister purge flow. To verify this condition, disconnect and plug canister purge line. If purge is present, close throttle plate until fluctuations stop.
Start engine. Operate engine at 2500 RPM for 30 seconds. Allow engine to idle for 2 minutes. Turn throttle stop screw until engine idles at 675 RPM.
Turn off engine. Repeat step 4). Turn off engine. Disconnect negative battery cable for at least 5 minutes. Connect ISC air by-pass solenoid connector. Connect negative battery cable. Verify throttle plate is not stuck in bore and linkage is not preventing throttle stop lever from contacting throttle stop.
Start engine and allow to idle for 2 minutes. Snap throttle open and return to idle. Lightly press and release accelerator. Allow engine to idle. If engine does not idle properly, see TESTS W/O CODES article.

IDLE SPEED SPECIFICATIONS

Application

M/T RPM

⁽¹⁾ A/T RPM

B2200

Carbureted

825

PFI ⁽²⁾

750

770

B2600i ⁽²⁾

750

770

Miata ⁽³⁾

850

MPV

2.6L ⁽²⁾

750

770

3.0L ⁽²⁾

800

MX-6 ⁽²⁾

750

Navajo

⁽⁴⁾

Protege ⁽³⁾

750

323 ⁽³⁾

750

626 ⁽²⁾

750

929 ⁽³⁾

N/A

700

⁽¹⁾	Place automatic transmission in Park.

⁽²⁾	Connect jumper wire between Green test connector and ground.

⁽³⁾	Connect jumper wire between terminals TEN and GND of Green test connector.

⁽⁴⁾	Idle speed is not adjustable; however, throttle angle (minimum air rate) can be set using special procedure. See IDLE SPEED under IDLE SPEED & MIXTURE .