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.
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
Was this
answer
helpful?
Yes
No
-1
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.
Was this
answer
helpful?
Yes
No
Tuesday, August 17th, 2010 AT 7:43 PM

Please login or register to post a reply.

Related Engine Revs Up Content

Idle Air Control Motor Replacement
GUIDE
Idle Air Control Motor Replacement
The idle air control motor or idle speed control motor is designed to adjust the air flow into the intake manifold at engine idle. Engine idle speed is monitored by the PCM...
VIEW MORE