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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 221 (Engine Controls - Basic Diagnostic Procedures - 6.6L Diesel) >> Idle Speed

Idle Speed

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Idle speed is controlled by ECM. Incorrect idle speeds are normally caused by dirty throttle plates or vacuum leaks.

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