Re: Emissions Failure in CA - Help! Help! - Saab 900 Bulletin Board - Saabnet.com
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Re: Emissions Failure in CA - Help! Help!
Posted by saab86 [Email] (more from saab86) on Wed, 19 Mar 2008 17:28:01
In Reply to: Re: Emissions Failure in CA - Help! Help!, saab86, Wed, 19 Mar 2008 17:13:52
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Nitric oxide emissions are caused by combustion temperatures that exceed
2,500deg F. If you're failing smog due to high NO, there are several
possible causes (the cat *apparently* having been ruled out):
1) Ignition timing too far advanced
2) Excessive combustion chamber deposits (unlikely unless car has been
woefully maintained)
3) Poor cooling (gauge reads high)
4) Lean combustion due to old or defective oxygen sensor
5) Lean combustion due to clogged injectors
6) Defective new cat (it happens!)
i'm guessing timing so stick all the required stuff back on - get a new cat and set the timing back to normal - and oh yeah clean your injectors
posted by 209.197.138...
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