Download Models: 1999-2002 Chevrolet and GMC C/Ok Pickup and Utility Fashions 2002 Cadillac Escalade (2WD) with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, U – RPOs LR4, LM7, L59, LQ4) This bulletin is being revised to add an additional engine to the fashions section. Please discard Company Bulletin Quantity 01-06-01-028 (Part 06-Engine). A number of the above vehicles could exhibit an engine knock noise that begins within the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most frequently seen during preliminary start- up and usually disappears inside the first 5-30 seconds (may last longer in excessive chilly temperatures). The noise is normally extra noticeable on the preliminary start-up when the temperature is beneath 10Â°C (50Â°F) and may be more pronounced on the first cold begin following an extended trip. This noise may be attributable to an interaction between carbon that has shaped on the piston, the piston motion and the cylinder wall.