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2002 Buick Regal HIGH RPM AFTER WARMUP

Tiny
GENEIMLER
  • MEMBER
  • 2002 BUICK REGAL
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 22,000 MILES
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.
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Tuesday, August 17th, 2010 AT 7:25 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the idle air control valve and test throttle position sensor, also look for vacuum leaks
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Tuesday, August 17th, 2010 AT 7:39 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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.
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Tuesday, August 17th, 2010 AT 7:43 PM

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