One problem related to gas recirculation valve (egr valve) has been reported for the 2001 Chevrolet Silverado. The most recently reported issues are listed below.
4. 3 liter v6 engine w/standard trans. - butterfly valve in engine air intake throttle body has shallow cup riveted to engine side (underside) of flat butterfly valve. This shallow metal cup is tearing loose, with outside edge bending downward and away from flat butterfly valve to approx. 30 degrees. The bend is at the riveted joints where the cup is anchored to the flat butterfly valve. The cup metal has two tears in the metal where rivets have held fast. Vehicle has 40,000 miles and is in good condition, driven on city streets only. Dealer says will fix free if Chevrolet service center gives ok, and Chevrolet service center says dealer must approve. Problem has potential for catastrophic engine damage and/or engine fire. Please help.