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Mixture Control (MC) System: Pickup

Remove air cleaner. Start engine. Disconnect vacuum hose from MC valve. Check that vacuum is felt from MC valve air inlet. See Fig 1.
NOTE: When vacuum hose to MC valve is reconnected, it is normal for engine to idle rough or stall.
Reconnect vacuum hose and check that vacuum is momentarily felt. If MC Valve does not function as described, replace MC valve.

Fig 1: MC System Components & Parameters (Pickup)

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Fig 2: Corolla (Calif.) Carb Feedback Vacuum Diagram & Parameters

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Fig 3: Corolla (Federal) Carb Feedback Vacuum Diagram & Parameters

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Fig 4: Corolla Carb bk Comp & Parameters (Cold, Below 45°F (7°C))

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Fig 5: Corolla Carb bk Comp & Parameters (Hot, Above 63°F (17°C))

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Fig 6: Pickup (22R Calif.) Carb bk Comp & Param (bk On)

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Fig 7: Pickup (22R Calif.) Carb bk Comp & Param (bk OFF)

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Fig 8: Tercel Carb Feedback Components & Parameters

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