Low Stall Speeds (Stall in Ranges 1-5)

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Problem	Action
Engine not performing efficiently. Inspect for the following conditions: Plugged or restricted injectors High altitude conditions Dirty air filters Incorrect fuel/valve timing Throttle linkage broken or not properly adjusted Electronic engine controls condition	Refer to the Engine section of this manual. The following specific sections should be helpful in defining the problem: Refer to Diagnostic System Check - Engine Controls in Engine Controls - 6.6L (LB7). Refer to Diagnostic System Check - Engine Controls in Engine Controls - 8.1L. Refer to Symptoms - Engine Mechanical in Engine Mechanical - 6.6L (LB7). Refer to Symptoms - Engine Mechanical in Engine Controls - 8.1L.
Stall speeds of 33% of normal implies freewheeling stator	Replace converter assembly. Refer to Torque Converter Replacement .
Engine smoke controls	Compare lugback to static stall speed.
Incorrect torque converter	Install correct torque converter. Refer to Torque Converter Replacement .