I'd start with an exhaust leak suspect - Saab 900 Bulletin Board - Saabnet.com
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I'd start with an exhaust leak suspect
Posted by Siegfried (more from Siegfried) on Tue, 9 Jul 2013 07:37:56
In Reply to: HIgh Nox - Oxygen Sensor or Cat or both?, Saabina [Profile/Gallery]
, Mon, 8 Jul 2013 19:32:18
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Saabina,
high NOx values mean way too high combustion temperatures or overheated catalytic converter. Since you are not going to remove a plug off the exhaust manifold (or to drill a hole anywhere in the exhaust before the cat) in order to be able to check pre-cat emissions and make your troubleshooting from there, you might want searching this BB with a 'high nox' search key. See the link below.
Good luck,
Zig
posted by 188.134.4...
public wisdom on high NOx emissions
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