• Tiny
  • masp5555
  • Oldsmobile

I have a 1999 Olds Alero 3400 (3.4L) Automatic with 161,000 miles that idles at 500-600 rpm regardless whether the A/C is on or off. Sometimes it will idle at 750 rpm and smooth out, not that the lower idle is that rough. The DTC P0506 is the only trouble code that comes up which references to the IAC Valve. I have an emission test that the car needs to pass here in Texas but with that check engine light on it will not pass.
Any ideas?

P.S. Sometimes, at cold start up(50-80 degrees) it will lope slighlty and die. On restart, it will generally smooth out at the low idle condition.

Thanks again for any info

Friday, October 12th, 2007 AT 9:58 AM

1 Answer

  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

The IAC is the Idle air control valve, it is bolted to the side of your throttle body, either try taking it off and cleaning it and the throttle bore, or replace it.

Was this
Friday, October 12th, 2007 AT 1:28 PM

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