2004 Ford Taurus

Car stalls at stop lights ~once every 3 days.

Throttle body cleaned out ($150) - no difference.

Replaced IACV with Motor Craft OEM ($80). No stalling for 5 days but then back to original behavior - no difference now.

The work around is placing the car neutral at all stop lights, then doesn't stall.

  • What is the next item to check?
  • What other components are involved for this and how can each be tested/diagnosed?
  • Reasons not to put back the old IACV (to save some money)?

Any help is appreciated.

  • 1
    Did you reset idle strategies after cleaning the throttle body?
    – Moab
    Commented Jun 23, 2018 at 20:17
  • 1
    Do you have access to at least OBD2 live data? I think it may be beneficial to see fuel trims, o2 voltages, maf, map, load%, and coolant temp at idle and cruise. As far as putting the old iac valve back on to save money, any parts distributor I know of doesn't return electrical if installed.
    – Milison
    Commented Jun 23, 2018 at 21:17
  • @moab: I don't think the mechanic did that...just unplug the battery?
    – P.S.
    Commented Jun 24, 2018 at 3:42
  • @milison: I don't but can get one...please put as answer and as to what a bad value for each one would be and what component it relates to. (FYI Amazon returned, told them I tried it...different business model than the old shop).
    – P.S.
    Commented Jun 24, 2018 at 3:50
  • Are there no codes stored now or in the recent past?
    – Milison
    Commented Jun 24, 2018 at 4:17


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