Every time I let my car sit for 2 hours or more, I start it up and the belt on the tensioner squeak for 15 seconds. Also the battery light comes on and the rim fluctuate between 1,000 and 2,000. When I drive it the battery light will continue to stay on but every time the air bag light turns on and I'm accelerating the engine will not shift, the rpms will rev up to red line if pushed that far, eventually the light for airbag and battery will shut off and it will shift. Sometimes when I hit the gas pedal while this is doing this at night, my dashboard as well as radio lights will shut off until rpms go down to 2,000.

- Ann Arbor, MI, USA

The contact owns a 2003 Pontiac Sunfire. While driving at an unknown speed, the contact heard a rattling noise from the engine compartment. The vehicle was taken to an independent mechanic who stated that the timing chain separated and caused the tensioner and valve to fail. The timing chain valve and tensioner were replaced, but the failure recurred. The vehicle was not repaired. The failure mileage was 98,000.

- Mansfield , OH, USA