Idle Speed & Mixture

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NOTE: On vehicles with fuel injection, idle mixture is controlled by the Single Board Engine Controller II (SBEC-II). Idle mixture adjustment is not required or possible on fuel injected models. On carbureted models, mixture should be adjusted only if vehicle fails emission testing or carburetor has been disassembled.

IDLE SPEED - 5.9L

Application

RPM

5.9L

⁽¹⁾ 600

⁽¹⁾	Idle drop should be 20 RPM.

NOTE: If final RPM differs more than 30 RPM from specified curb idle, reset curb idle, and repeat mixture adjustment.