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Home >> Nissan-Datsun >> 1985 >> 300ZX GL, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (ECC CEC System) >> Operation >> Engine Controls >> Engine Idle Speed

Engine Idle Speed

WARNING: This page is about a different car, the 1985 Nissan 200SX. However, it is still accessible from the selected car via links, so may be relevant.

Auxiliary Air Control (AAC) valve is used to control idle speed. Valve is operated by a vacuum signal from vacuum control modulator and works much like an EGR valve does. It allows extra air into throttle chamber, which increases idle speed. Control unit monitors speed with crankshaft angle sensor and continually corrects idle speed by operating vacuum control modulator.

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