Oil Level Indicator Tube Vibration

This information applies to 2007-08 fullsize pickups and utilities with engine RPO L76, L92, LC9, LH6, LMG, LY2 or LY5.

Some customers may comment on a buzz and/or rattle noise that occurs at 40-45 mph
(64-72 km/h) and/or 1100-1300 rpm just before the V4 to V8 transition. The noise sounds
as though it's coming from within the IP. The cause may be the generator B+ cable misrouted on the outboard side of the engine oil level indicator tube (fig. 12). At 1200 rpm
in V4 mode (AFM), the engine oil level indicator goes into resonance and vibrates against the generator cable which produces a rattle noise in the vehicle.

A  Cable touching  oil level indicator tube

To correct this concern, reroute the generator B+ cable on the inboard side of the engine
oil level indicator (fig. 13). Be sure the generator cable has at least 15 mm of clearance to the engine oil level indicator tube.

B  15 mm clearance between cable and oil level indicator tube

- Thanks to Jim Will