Actually, excessive HC is usually indicative of a mis-fire condition or leaky valves, usually exhaust. Rich mixture will show as excessive CO. The borderline NOX reading here indicates the catalyst is shot and or the ignition timing is too advanced. The good Co reading indicates the mixture is probably where it should be. With the nigh NOX, my forst choice would be to replace the Cat. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Frank Condelli Sent: Saturday, March 06, 2004 6:49 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: Emissions testing 2.1 In a message dated 05/03/2004 2:33:41 PM Eastern Standard Time, josorio@atlas.kennesaw.edu writes: While we are on this subject, I just went thru the same deal here in Boston. As I was expecting I didn't pass emissions although the only item I failed was the "HC GPM" My reading was 05.31 and the limit is 03.20 Any Ideas? FYI my other readings were: CO GPM Reading: 020.61 Limit: 080.00 PASS NOX GPM Reading: 06.51 Limit: 07.00 PASS CO2 GPM Reading: 369.81 Jorge, HC reading is the hydro carbons reading. It is high which indicates the engine is running too rich a fuel mixture. Therefore you need to check all the components on the engine that control the information sent to the computer which in turn tell the computer how to adjust the fuel mixture. Throttle position switch, Temp II switch, AFM, Oxy sensor, CAT, exhaust system leaks, air intake leaks, vacuum leaks, air filter, timing, cap & rotor, ignition wires ignition coil, ground wires, and ultimately the condition of the motor. Cheers, Frank Condelli Almonte, Ontario, Canada _BusFusion_ (http://members.aol.com/BusFusion/bfhome.htm) a VW Camper camping event, Almonte, ON, June 10 ~ 13, 2004 '87 Westy & Lionel Trains Member: _Vanagon List_ (http://www.vanagon.com/) , _LiMBO_ (http://www.bcn.net/~limbo/) , _IWCCC_ (http://www.westfalia.qc.ca/) & _CCVWC_ (http://www.ccvwc.ca/) Vanagon/Vanagon Westfalia Service in the Ottawa Valley _STEBRO/Vanagon Stainless Steel Mufflers_ (http://members.aol.com/Fkc43/stebro.htm) _Frank Condelli & Associates_ (http://members.aol.com/Fkc43/busindex.html) or http://frankcondelli.com |
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