One problem related to engine knocking noise has been reported for the 1999 Chevrolet Silverado 1500. The most recently reported issues are listed below.
Tl the contact owns a 1999 Chevrolet Silverado 1500. The contact heard an abnormal knocking noise while starting the vehicle. In addition, the driver and passenger side plastic rollers were fractured and caused the seats to move. There were no warning indicators illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was 142,000.