Replace timing belt tensioner and idler pulleys when replacing timing belt on Pontiac Grand Prix

The timing belt may fail prematurely. Our technicians tell us that the belt tensioner and idler pulleys should be replaced when the timing belt is replaced.
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Average mileage: 86,000 (86,000–86,000)
Engine affected: 3.4L V6
7 model years affected: 1991, 1992, 1993, 1994, more1995, 1996, 2002
7 people reported this problem
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problem details
2002 Pontiac Grand Prix 86,000 mi,
Changed water pump on car now been fighting to get belt back on and the tensioner bolt came loose tried tightening it but not fully tightening like it should. I have the 3.8 liter engine