Running to lean can give high CO. from your readings it looks like you are actually running lean.
On 10/25/04 9:20 PM, "Tom Young" <tomyoung1@COMCAST.NET> wrote: > From: "Dennis Haynes" <dhaynes@optonline.net> > To: "'Tom Young'" <tomyoung1@COMCAST.NET>; <vanagon@GERRY.VANAGON.COM> > Sent: Monday, October 25, 2004 7:38 PM > Subject: RE: Calif Smog Issues > > >> It would be helpful to give us the test readings and the requirements. >> The major difference in the Federal and CA versions for that year is the >> CA gets a larger catalyst, 3-way, located on the side instead of the >> rear and closed loop operation with the O2 sensor. The O2 sensor is >> required with the 3-way cat to reduce NOx emissions, a leading >> contributor to smog. In order to test the effectiveness of the cat, EGR, >> etc, at reducing NOx, the engine must be placed under load. That is why >> the dyno test is required. > > The dyno test was implemented by California to get older cars off the road. > The stress placed on the engine *does* give a truer picture of pollution > emissions while driving. > > HC CO NO > Max Meas Max Meas Max Meas > M1: 15 MPH 130 78 0.94 1.83 1106 446 > M2: 25 MPH 103 72 0.74 1.80 936 282 > > The catalytic converter is a 1.9l water-cooled cat that I installed because > it had the O2 sensor port built-in. When I was getting funky readings from > that setup I went ahead and installed the O2 bung further upstream. > >> >> To say you "think" your engine is sound implies, not sure. Compression >> and leak down test is in order. These engines are notorious for burned >> valves, dropped seats, and burned out head gaskets or loose heads. >> > > I've only got about 3,000 miles on the engine since I rebuilt it. It runs > very strong, so my seat-of-the pants response is that the engine is sound. > >> The basic setting for the mixture is only effective near idle speed. >> After that, anything wrong with the mixture requires diagnosis and >> repair. Look for leaking injectors and vacuum leaks. Provide some >> numbers and we can be more helpful. > > --------------------------------------------------- > Tom Young > Lafayette, CA 94549 > --------------------------------------------------- > > >> >> Dennis >> >> >> -----Original Message----- >> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf >> Of Tom Young >> Sent: Monday, October 25, 2004 8:07 PM >> To: vanagon@GERRY.VANAGON.COM >> Subject: Calif Smog Issues >> >> Hi all: >> >> Took my '82 (Federal) to a Test Only station and failed fairly >> significantly >> in the Hydrocarbons (HC) and Carbon Monoxide (CO). I'd installed an O2 >> sensor in the crossover pipe but was getting very funky readings from >> the >> sensor so after failing Smog I took the vehicle to a local VW dealer and >> had >> them set the basic air/fuel mixture, which they did. Went back to the >> Test >> Only station and tried again. This time the HC was OK but the CO was >> still >> too high. >> >> The engine is, I think, mechanically sound and the ignition components >> are >> all in order with fairly new plugs, wires, distributor cap and rotor. >> I've >> also installed a Pertronix ignitor. The catalytic converter is new. >> Did >> the oil change thing, brought the car in hot, etc. >> >> Question 1: At this point, it seems like the mixture is still too rich >> and >> the answer is to continue leaning it down. Agree? >> >> Question 2: Since the VW dealer isn't a Test Only station and can't test >> emissions on a dyno like the Test Only stations do (I'm told the stress >> of >> running on the dyno tends to push up the pollutants as compared to the >> static idle and unloaded 2000 rpm tests) how the heck do you get >> adjustments >> done without just going back, and going back, to the Test Only station? >> >> Question 3: I've got my O2 sensor installed in the "J" bend of the >> crossover >> pipe, shortly after the connection to the left-side heat exchanger. >> Even >> after VW set the basic mixture I'm still getting anomalous readings. >> Sometimes when I hook up the voltmeter the reading will be "high" (like >> .710) and slowly drift upward. Sometimes the reading will be "low" >> (like >> .387) and drift downward. I've watched the voltage move up (and down) >> across the .5 volts reading and it's very languid and constantly up or >> down >> without the rapid up and down fluctuations I'm accustomed to seeing on >> my >> California vehicle. (I've used the O2 sensor in the California vehicle >> many >> times to adjust the basic mixture.) This is with 3 different O2 >> sensors, 2 >> of them new. Does any of this suggest some fundamental problem that >> I've >> overlooked? >> >> TIA. >> --------------------------------------------------- >> Tom Young >> Lafayette, CA 94549 >> --------------------------------------------------- >> >> > > •••••••••••••••••••••••••••••••••••••••• jimt Planned insanity is best. Remember that sanity is optional. http://www.tactical-bus.info (tech info) http://www.westydriver.com |
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