2002 Buick Regal HIGH RPM AFTER WARMUP

2002 BUICK REGAL
22,000 MILES • 6 CYL • FWD • AUTOMATIC
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GENEIMLER
  • MEMBER
  • 2 POSTS
Just replaced the catalitic converter and had the fuel system flushed. drove away and noticed that now the rpm idle is 1500 rpm all the time except when i first start it. then it is around 900 rpm but after 2 miles of driving it goes up to 1500 again and stays that high all the time. i disconnected the batery to reset the computer and nothing. it did not do this before i replaced the cat and the fuel system flush.
Aug 17, 2010 at 12:25 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Clean out the idle air control valve and test throttle position sensor, also look for vacuum leaks
Aug 17, 2010 at 12:39 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
With the kind of mileage you have on that one I might suspect some pretty severe wear in the throttle plates, throttle body housing and shafts that would lead to a very unstable idle due to the inability to control idle air bleed.
If you just did a fuel injection service, they may have cleaned the throttle body which would have exaggerated what I'm referring to.
Aug 17, 2010 at 12:43 PM
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