The timing is retarded - Saab 9000 Bulletin Board - Saabnet.com
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The timing is retarded
Posted by Cliff [Email] (more from Cliff) on Mon, 12 Aug 2002 22:30:43
In Reply to: High NOx Emission... Happy Ending, Yaofeng, Mon, 12 Aug 2002 13:55:58
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Nox is a gas that is only formed at excessive cylinder temperatures.
In your case ( I suspect) the wide gaps meant that the spark took longer to jump the gap, therefore the spark occured later. This effectively RETARDED the timing.. retarded timing causes overheating... high temperatures cause NOx
HOWEVER - don't be too happy yet. You BARELY passed and the standards quoted are VERY loose. Typically 3 times the manufacturers original planned limits when new.
I suspect another undiagnosed problem. Possibly a lean mixture, or an EGR problem.
I suggest you look further as the NOx figures are still excessive and you are definitly still polluting the air.
posted by 152.163.19...
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