WHEN STARTING THE VEHICLE AT ANY TIME THE ENGINE IDLES VERY ROUGH AND RPMS FLUCTUATE SIGNIFICANTLY ENOUGH THAT IT SHAKES THE VEHICLE. ENGINE NOISE IS VERY LOUD, EVEN FOR A SMALL DIRECT-INJECTED ENGINE. WHEN DRIVING THE THROTTLE IS SLOW OR JERKY TO RESPOND AND THE ENGINE NOISE INCREASES. AT DIFFERENT RPMS A RATTLING SOUND COMES FROM THE ENGINE COMPARTMENT, AS THOUGH SOMETHING IS LOOSE AND WILL FALL OFF. I HAVE HAD THIS VEHICLE AT OUR CHEVY DEALER SEVERAL TIMES FOR THIS ISSUE AND MOST RECENTLY FOR THE VEHICLE NOT SHUTTING-DOWN WHEN POWERED OFF. THE HIGH-PRESSURE FUEL PUMP WAS REPLACED BASED ON GM BULLETIN BUT NOTHING WAS DONE ABOUT THE LOUD AND OBSCENE ENGINE NOISE. DEALER STATED THIS WAS NORMAL OPERATION ALTHOUGH BULLETINS EXIST IN GM SYSTEM FOR TIMING AND VALVE-TRAIN ISSUES AND REPAIRS. I AM CONCERNED THAT THE ENGINE WILL SIMPLY QUITE ONE DAY UNDER NORMAL OPERATION. PLANNED OBSOLESCENCE AT 100,001 MILES? I WILL BE TAKING THE VEHICLE TO ANOTHER DEALER VERY SOON TO TRY AN REMEDY THE SITUATION AND UNDERSTAND MY CONCERN AND WORK WITH ME TO CORRECT ISSUES. *TR
2009
ELECTRONIC STABILITY CONTROL
WHILE DRIVING IN THE HIGHWAY, VEHICLE WARNINGS SUDDENLY TURNED ON INDICATION THAT STABILI-TRAC AND TRACTION CONTROL WENT OFF AND NEEDED TO BE SERVICED. AT THIS TIME ENGINE LOST POWER AND VEHICLE WAS SLUGGISH WHEN ACCELERATOR PEDAL WAS PRESSED. *TR