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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, disconnect Air Induction Valve (AIV). On all models, disconnect engine temperature sensor harness connector. Connect a 2500-ohm resistor between engine temperature sensor harness connector terminals.
  2. Start engine, and warm it to normal operating temperature (needle in middle of coolant gauge). Run engine for about 2 minutes under no load at 3000-4000 RPM, and then return 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. Reconnect AIV and engine temperature sensor harness connector.
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