Six problems related to engine exhaust system have been reported for the 1999 Chevrolet Silverado. The most recently reported issues are listed below.
Accelerator or throttle hangs up from dead stop, causing the vehicle to lunge upon acceleration - fuel gauge goes to full mark will not move until fuel tank is almost empty - engine has a sound like the valves are rattling after vehicle has set for 30 minutes or more - vehicle has a bad miss in the engine as if it will stop running this is intermittent most noticeably on inclement days - exhaust has a loud hum at 35 to 45 mph and any time you accelerate to pass or merge into traffic. ( dot number: 029056 tire size: p22570r16 ).
The passenger seat has been fixed 3 times, and still becomes loose. . . The seat belt is connected to the seat back. . . . . The steering wheel/box has been in for repairs 4 times, and only thing found is loose bolts, the exaust system was replaced 2 times, and found to be out of alignment on the 4th time in.
Exhaust: sounds like exhaust leak when accelerating from approx 4omph, dealer said it was smog pump. Drive shaft: clunking sound from rear of vehicle on take off, dealer said it was drive shaft and was normal. Transmission: shifting hard from 1st to 2nd and sometimes to 3rd. Windshield: clacking noise coming from windshield area at 50+mph. Dealer said it was trim and replaced it 3 times, not fixed.
The air pump valve is causing a whining noise in the engine . Dealer cannot determine defect.
Truck makes engine noise (best described as exhaust noise and/or spark knock and/or ping) that is mainly audible between 1000 - 2000 rpm, and is loudest at 45 - 55 mph under light acceleration going uphill.
There is a very strange odor in the passenger's compartment, cause unknown. Consumer believes that odor come in the vent system at openings both ends of hood seal.