2000 Crown Vic Idle/Stall problem - Ford Forums

dsundberg · 11-26-2007, 14:25

Occasionally, when I start my Crown Vic, it won't idle. I can drive it while holding the throttle partly open at stops, but it will stall if I completely let off of the accelerator. Eventually, it heats up and runs fine.

I've also noticed that it seems to hesitate or miss at part throttle as in trying to maintain a 30 MPH (or slower) speed.

Could the IAC valve be causing this and, if so, will this eventually set a trouble code in the computer?

dryelf327 · 11-28-2007, 10:55

IAC sounds likely but it won't throw a code. The miss at 30mph will not be the IAC though.

Vanessa2008 · 02-29-2008, 22:37

Quote:

Originally Posted by dsundberg

Occasionally, when I start my Crown Vic, it won't idle. I can drive it while holding the throttle partly open at stops, but it will stall if I completely let off of the accelerator. Eventually, it heats up and runs fine.

I've also noticed that it seems to hesitate or miss at part throttle as in trying to maintain a 30 MPH (or slower) speed.

Could the IAC valve be causing this and, if so, will this eventually set a trouble code in the computer?

I had a 1988 Crown Victoria with the same problem. I know this is quite a bit older but the problem with that vehicle was a part called the idle control arm. Once that was replaced the vehicle ideled like new. If it weren't for needing a quart of oil every 2 days I would never have upgraded the my 2006.

dsundberg · 03-01-2008, 05:45

The IAC definitely fixed the poor idle/stall condition, but the car still doesn't run smooth at low speed with the throttle barely open.