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Home >> Mercedes Benz >> 1983 >> 380SL >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH Cis >> Operation >> Idle Speed Control Systems >> Electronic Idle Speed Control
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Electronic Idle Speed Control

The system controls a variable air bleed into the intake system. Idle speed is held constant by increasing or decreasing the amount of extra air injected through an insulating sleeve around each fuel injector.

A high idle speed is maintained when engine temperature is below 107°F (40°C), then idle speed drops to a constant low idle RPM when engine temperature is above 107°F (40°C).

The idle speed control system consists of an idle speed adjuster, intake air distributor and an electronic control unit.

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