CAR INTERMITTENTLY WONT IDLE DOWN

2003 Buick Century

Tiny

Anonymous

March, 28, 2013 AT 1:42 PM

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?

1 Answer

Tiny

JDL

March, 28, 2013 AT 8:12 PM

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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