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Mod-O-Matic (beta!): Please vote with care. You must be logged in to use Mod-O-Matic Move post to: For Sale | Group Buy | Off Topic | NWS/Adult    Remove due to Spam/Troll | Prohibited       Highlight as: Informative | Success Story
 
Author:  
Jim Cash on 2004-04-05 at 14:31:38(posted from: Host: hse-toronto-ppp308236.sympatico.ca IP: 64.231.83.184) 
    
Subject:  
Re: Failed Emissions (NO PPM) (6437 views) 
Message: The Nitogen Oxide emissions come from running a lean burn engine. This is good in that it lowers CO emmsions but can cause the NO issue in the higher temperatures of a lean mixture operation.
The Cats are there to clean up the NO issue - so you may be dealing with an aging cat.

When going for an emmsions test it is best to do a good run (10-15 miles) and during that time do some heavy acceleration if possible.
Doing some "booting under load" just before you pull in for your test will also help heat up the cats (lots of snap-crackle-pop sounds when you shut off. This will help on your issue.

Last results on my 97 540i/A was (at 40km/hr)
HC - 31
%CO - .01
NO - 269

Cheers
Jim Cash
 
 

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