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Home >> Infiniti >> 1993 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Adjustment >> Idle Mixture
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Idle Mixture

NOTE: Idle mixture is computer-controlled. Adjustment is not normally necessary. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section for testing of fuel feedback system.
  1. On G20 (A/T Before Serial No. 450021 & M/T), disconnect battery and disconnect Pulsed Secondary Air Injection (PAIRC) solenoid valve harness connector. Disconnect PAIR valve hose and plug it at front tube side. On all models, disconnect engine temperature sensor harness connector. Connect a 2500 ohm resistor between engine temperature sensor harness connector terminals. On G20 (A/T Before Serial No. 450021 & M/T) connect battery.
  2. Start engine, and warm it to normal operating temperature (needle in middle of coolant gauge). Snap throttle to 2000-3000 RPM, 2-3 times under no-load, then allow it to idle. Check idle mixture (CO% level). See IDLE SPEED & CO LEVEL  table.
  3. After checking idle mixture, disconnect resistor from engine temperature sensor harness connector terminals and connect engine temperature sensor. On G20 (A/T Before Serial No. 450021 & M/T), disconnect battery, connect PAIRC solenoid valve, PAIR valve hose and engine temperature sensor harness connector. On G20, connect battery.
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