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Re: Running Rich - Failed Smog all categories - I'm Stumped
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Posted by Saabina [Email] (#33) [Profile/Gallery] (more from Saabina) on Wed, 21 Aug 2013 18:37:22 Share Post by Email
In Reply to: Re: Running Rich - Failed Smog all categories - I'm Stumped, Simon S, Wed, 21 Aug 2013 14:58:40
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Might be the Cat. I've replaced Cats recently on two classic Saabs that failed smog but only due to high Nox. The Cats fixed them both nicely. I ran it hard in 4th gear at 3500-4000 for about 20minutes before going to smog and the cooling fan was cycling. I swapped the O2 with a known good one and it also cycles properly between .2 and .7 volts and compensates when I pull a vacuum line. I swapped two other ECU's from running early 90's 900t's with no change. It spits a lot of condensation when idling and my nose smells rich exhaust. Neither of the other cars do this in the same weather and running conditions.

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