Failed emissions for NOx - Saab Performance Bulletin Board - Saabnet.com
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Failed emissions for NOx
Posted by jerrit [Email] (more from jerrit) on Fri, 30 Jul 2010 11:25:37
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I searched the board just a minute ago and it looked like most people were failing for CO/HC, excuse me if I missed a post that covered my situation.
I've got a viggen that's nowhere near stock anymore, built motor and usual bolt-ons, but it's still on stock injectors. In the past, all I had to do to get it to pass emissions has been to swap the nordic ecu out for the stock one. That didn't work this time, I failed badly for NOx, but was more or less ok on CO/HC.
With stock software, implying stock timing, I can't think of what else to try next. I'm still using the hotter bcpr7es plugs and I've got the vacuum hoses configured a little differently, so I'll put those back to stock, but it doesn't seem like that alone could account for the difference. Any ideas?
posted by 216.239....
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