Chevrolet Workshop Manuals
C 1500 Truck 2WD V8-350 5.7L (1989)
Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Relay Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Relay Module: > 911396C > Dec > 90 > Engine - Reduced Performance In Warmer Climates > Page 35
Some 1988-91 C/K light duty trucks may experience a condition of reduced engine performance in warmer climates during heavy usage or towing. This
Vehicles that are diagnosed as exhibiting this condition may be repaired by replacing the collapsed duct with a new duct assembly made of a new
The condition was corrected in production effective with the following VIN breakpoints:
Remove resonator hold down strap (see Figure 2).
Remove resonator and rear air intake duct.
Remove duct adapter from fender.
Remove engine coolant reservoir.
Remove underhood retractable light assembly (if equipped).
Remove battery cables, battery hold down bolt and remove battery from vehicle.
Remove ground strap bolt at fender.
Remove inner fender duct front retaining screw from fender.
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