IACV or Catalytic Converter?

Asked by Jun 10, 2012 at 11:39 AM about the 1999 Subaru Legacy 4 Dr L AWD Wagon

Question type: Maintenance & Repair

How do I know if my idling problem is the IACV (threw that code when hooked to machine) or the catalytic converter that a retired mechanic suggested it could be?  I live in an extremely small town with limited mechanics and no one here just will assess the situation.  They just keep replacing things and hope it fixes it and I can not afford to do that.  The car idles very rough at standstill and when accelerating, seems to take a bit to get to speed.  Help!  I am a single parent and this is my only vehicle. I need a suggestion as to what to ask so I do not get ripped off.  Thanks.

2 Answers


I don't think the idle would be affected by the catalytic converter.


nope, not the cat. those IACV get very dirty. carb cleaner should clean it right out. they've veryyyy expensive to replace on subarus

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