Several of my exhaust manifold bolt heads broke off even though they have never been removed causing hot exhaust to leak out igniting some electrical wiring. My mechanic told me this is a very common problem with GM V8's.

- Lamar, CO, USA

1999 and up Chevy GMC Silverado with the 6.0 liter engine are having problems with the exhaust manifold bolts rusting off. This creates and exhaust leak that is bad for air pollution not to mention with gas in the area a fire hazard. This problem need a recall and many have the problem and don't know it and the ones that do fix it pay a lot of labor cost this is a fairly labor intense job.

- Casco, WI, USA

The following have all been replaced: 5.3 L engine, catalytic converter, four oxygen sensors, 1 starter sensor, 1 crank sensor, 1 window regulator, rear air-vent assembly, 1 shaft in the front suspension, 1 headlight bracket, 1 knock sensor, 4WD switch, 1 clamp for rear window. Vehicle is 15 months old and has 32 days of in-shop service. Service engine light has come on 4 times in 14 days. On 12/4, vehicle stalled when attempting to accelerate. Engine had a spare part left in at manufacturing and was destroyed from the part flying around inside. ABS has engaged too soon in the past and vehicle could not be stopped.

- Barney, GA, USA

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.

- Millinton, MI, USA

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 )

- Pineville, LA, USA

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

- Verona, NJ, USA

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.

- Anaheim, CA, USA

The air pump valve is causing a whining noise in the engine.dealer cannot determine defect.

- La Mesa, CA, USA