The muffler heat shield may become loose on the muffler causing a rattle or popping noise. Our technicians tell us there is a kit available from GM to correct this problem.Google+
Car Problem Reports
Chevrolet Silverado 1500 Popping Noise From Muffler Heat Shield
Chevrolet Silverado 1500 Problem
Exhaust & Emissions Affected: V8
Average Mileage: 113,400 mi (39,000 mi - 245,000 mi)
Visitor, 1999 Chevrolet Silverado 1500, 245,000 mi
Removed catalytic converters several years ago. Around 240000 miles heat shield started rattling. Thinking about just taking it off.
Visitor, 2002 Chevrolet Silverado 1500
awful vibration noise coming from underneath vehicle toward the rear.
Visitor, 2006 Chevrolet Silverado 1500, 98,000 mi
Mechanic heated the shield, bent it so it would not touch and this cured the problem.
This happened to me as soon as i got the truck, took the shield off, cut and trimmed, and used green lochtite on the bolts, no more noise.
Visitor, 2002 Chevrolet Silverado 1500, 39,000 mi
popping, or "oil can" pop while idling
Visitor, 2001 Chevrolet Silverado 1500
there is a raddle