Three problems related to gas recirculation valve (egr valve) have been reported for the 2003 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Chevrolet Impala based on all problems reported for the 2003 Impala.
Second car affected. First car burned and totaled . Second car found loss of power still driving puled over found egr motor stuck in full open sending hot exhaust into intake. Melting plastic intake wiring and fuel line. Fuel line melted but did not burst. Towed home. This should at least have a fire line at top of intake. This is a plastic line .
Problem started with the trans - wasn't shifting right, hard shift. Took it to rotolo chevy in fontana, CA. Catalytic converter, nearly $800 to get new one only to have the car completely die on the side of the road when the tranny disintegrated. Replaced under warranty. Ever since I have had shifting difficulties - took it back a week later to be told it has a "Smart adapt" in trans and needed approx 1000 miles to sync itself, now the car sputters, has a misfire code in cylinder 2, trans code. Hard starts, randomly stalls when making right turns, interior and exterior lights surge when at an idle, car constantly feels like it wants to stall - it can actually make you nauseas when sitting at a stop light because of the surging of the car. This morning the car just stalled when I was at a stop sign. All plugs, plug wires and coil pack for cylinder 2 have been replaced with no correction to how the car runs. Sounds and feels worse when you put the car into reverse, but smooths out some when in drive. Filed complaint with bar regarding cat replacement, recommended refund to dealer for unnecessary item - dealer refuses to give money back. Told me car would never run right after the tranny was replaced because I refused to have them change the motor mounts. The car has not run right since, but a second opinion found that the mounts were ok - recommended that one of the back mounts be replaced as it was more worn than the others.
While driving at various speeds, the engine would stall and shut off. The problem started at 90,000 miles. Have brought the car to the chevy dealer and they have not been able to diagnose the problem. The car is not generating any error codes. I almost got into an accident twice due to shutting off during acceleration. I have noticed that the stalling or shutting off starts after the temperature reaches approximately 125 degrees f and happens randomly. When I am operating the air conditioner, the stalling is more noticeable due to the engine load. So far, the dealer has replaced the crank sensor and ignition module which has not corrected the stalling and shutting down.