TIMING CHAIN BREAKS, ENGINE STALL

ON MAY 22, 2008, THE OFFICE OF DEFECTS INVESTIGATION (ODI) WAS PETITIONED BY THE NORTH CAROLINA CONSUMERS COUNCIL (NCCC) TO BROADEN THE SCOPE OF SAFETY RECALL 07V-519, WHICH WAS CONDUCTED BY GENERAL MOTORS CORPORATION (GM) FOR MODEL YEAR (MY) 2001 SATURN L-SERIES VEHICLES EQUIPPED WITH THE L61 2.2L ENGINE AND BUILT DURING A 4-MONTH PERIOD FROM NOVEMBER 2000 THROUGH FEBRUARY 2001 (DP08-002). ON OCTOBER 16, 2008, ODI GRANTED DP08-002 AND OPENED PE08-061 TO INVESTIGATE TIMING CHAIN FAILURES RESULTING IN ENGINE STALL WHILE DRIVING (SWD) IN THE SATURN L-SERIES VEHICLES EQUIPPED WITH L61 ENGINES AND THAT USED THE SAME DESIGN TIMING CHAIN AND TIMING CHAIN LUBRICATION SYSTEM AS THE RECALLED VEHICLES. A REDESIGNED TIMING CHAIN AND LUBRICATION SYSTEM WERE IMPLEMENTED LATE IN MY 2002 PRODUCTION (MAY 1, 2002). HENCE, THE SUBJECT VEHICLES FOR THIS INVESTIGATION ARE ALL MY 2000 THROUGH 2002 SATURN L-SERIES VEHICLES EQUIPPED WITH 2.2L L61 ENGINES AND BUILT PRIOR TO MAY 2002 THAT WERE NOT INCLUDED IN RECALL 07V-519. IN THIS INVESTIGATION, ODI ANALYZED UPDATED COMPLAINT AND WARRANTY CLAIMS DATA FOR TIMING CHAIN FAILURES RESULTING IN INCIDENTS OF ENGINE STALL WHILE DRIVING, WHICH COMPRISE SLIGHTLY OVER HALF OF ALL TIMING CHAIN FAILURES OCCURRING IN THE SUBJECT VEHICLE POPULATION. ODI'S ANALYSIS OF COMPLAINT AND WARRANTY DATA SHOWS THAT VEHICLES PRODUCED WITH THE SUBJECT TIMING CHAIN AND LUBRICATION SYSTEM EXPERIENCED ELEVATED FAILURE RATES WHEN COMPARED WITH THE MY 2002 THROUGH 2003 VEHICLES USING THE REVISED COMPONENTS. HOWEVER, THE ANALYSIS ALSO SHOWED THAT THE MY 2001 SATURN L-SERIES VEHICLES RECALLED IN 07V-518 EXPERIENCED A SIGNIFICANTLY HIGHER RATE OF TIMING CHAIN FAILURES THAN THE SUBJECT VEHICLES. THE COMPLAINT RATE FOR TIMING CHAIN FAILURES RESULTING IN SWD WAS APPROXIMATELY 5 TIMES HIGHER FOR THE RECALLED VEHICLES,19.2 INCIDENTS PER THOUSAND VEHICLES (IPTV), THAN FOR THE SUBJECT VEHICLES, 3.7 IPTV. THE WARRANTY CLAIMS RATE FOR CHAIN FAILURES RESULTING IN SWD WAS OVER 3 TIME