CAR INTERMITTENTLY WONT IDLE DOWN

  • Tiny
  • Anonymous
  • 2003 Buick Century
  • 200,000 miles

Car intermittently won't idle down. At times runs 65 mph without
foot on gas pedal.

I have had the transmission checked (nothing wrong); disconnected the Cruise control, the only code display is PO446 Evap Control system which has been showing for 2 years. We replaced every sensor, took the Evap canister down, even replaced gas cap, nothing cured it. So I just drove it with engine light on. What is the problem?

Thursday, March 28th, 2013 AT 1:42 PM

1 Answer

  • Tiny
  • JDL
  • Expert
  • 16,290 posts

Block off the mouth of throttle body, see if it has any effect on the idle? It should kill the engine. If no effect on idle, look for a vacuum leak.

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Thursday, March 28th, 2013 AT 8:12 PM

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