K 1500 Truck 4WD V8-4.8L VIN V (1999)
Crankshaft Position Sensor: All Technical Service Bulletins
Engine - Whirling Sound From Lower Rear
Bulletin No.:
00-06-01-001
File In Section:
06 - Engine/Propulsion System
Date:
February, 2000
Subject:
Engine Noise (Check/Replace Crankshaft Position Sensor)
Models:
1999 Chevrolet and GMC C/K Models (Silverado and Sierra) with 4.8 L or 5.3 L V8 Engine (VINs V, T - RPOs LR4, LM7) Built within the VIN
breakpoints shown in image.
Condition
Some customers may comment on a whirling sound from the lower rear side of the engine. This occurs as the engine warms up, between 1500 and 2000
engine RPM. The sound may not be present on a cold engine.
Cause
The crankshaft position sensor may be making contact with the reluctor ring.
Correction
IMPORTANT:
Dealers may encounter a few vehicles, shipped from the vehicle assembly plants, which have a 2nd rubber 0-ring installed over the crankshaft
position sensor, and a copper shim under the mounting tab.
