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Old 12-30-2014   #8
Marc Haibeck
 
Join Date: May 2007
Location: Addison IL
Posts: 252
Default Re: Catalytic converters?

If it is still idling poorly I would approach it from that angle. It's easy to work with in the garage. You have good fuel pressure at idle. A clogged catalyst usually won't effect the idle. The faces of the catalyst substrates can be viewed through the oxygen sensor hole.

Do a spark test. The spark should be at least 1/4" long, blue and make a nice snapping sound.
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