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shenan-agon Samba Member
Joined: May 11, 2005 Posts: 423 Location: Portland, OR
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Posted: Fri Sep 23, 2005 2:53 pm Post subject: Failed emissions test - help me out... |
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Okay, finally got around to taking my Westy to the DEQ station today. Results are here:
HC (max=220ppm):
idle: 457ppm failed
2500rpm: 1504ppm failed
CO (max=1.00%):
idle: 0.97% passed! barely...
2500rpm: 1.49% failed
Things I've already done to the van recently:
new air filter
new oil/filter
new plugs
new wires
new cap/rotor
new thermostat
I have not adjusted timing, played with CO screw, checked O2 sensor. I don't know the condition of the cat. The idle stabilizer valve is currently unplugged (erratic idle when it's plugged in - I've tried cleaning it out, and I repaired a burned-out transistor in the IS control module; fixed the ~4000rpm idle, but it's still unstable). Idle is a bit lumpy, and the van was idling at 1184rpm during the test. It was fully warmed up, and had been on a few high speed runs before pulling into the test station.
So what do you guys think? Do those CO & HC numbers mean anything obvious to you? |
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lordsniff Samba Member
Joined: April 12, 2005 Posts: 432 Location: atlanta
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Posted: Fri Sep 23, 2005 3:48 pm Post subject: |
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check your O2 sensor. _________________ I was born at a very early age and it was such a shock I didn't speak for another 2 years .
______________________________________
87 Syncro
85 Gl
96 Dodge Ram V10
2001 Honda |
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r39o Samba Polizei
Joined: May 18, 2005 Posts: 9800 Location: San Diego
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Posted: Fri Sep 23, 2005 3:54 pm Post subject: |
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What was your NO like?
Replacing the O2 sensor is a prudent thing to do.
Cats don't last forever.
Because of high NO, I seem to replace cats every 4 years.
Your mixture is off, you may need to do a low emissions adjust. _________________ "Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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shenan-agon Samba Member
Joined: May 11, 2005 Posts: 423 Location: Portland, OR
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Posted: Fri Sep 23, 2005 3:59 pm Post subject: |
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Oregon doesn't test for NO, so I can't comment on that one...
I'll give the van the ol' once-over this weekend and see what I come up with. O2 sensor should read around 0.5V, right? |
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Randy in Maine Samba Member
Joined: August 03, 2003 Posts: 34890 Location: The Beach
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shenan-agon Samba Member
Joined: May 11, 2005 Posts: 423 Location: Portland, OR
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Posted: Fri Sep 23, 2005 5:46 pm Post subject: |
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I do now!
Thanks, that helps understand the relationship between HC, CO, mixture, etc... |
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r39o Samba Polizei
Joined: May 18, 2005 Posts: 9800 Location: San Diego
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Posted: Fri Sep 23, 2005 6:23 pm Post subject: |
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Basically, if you have high NO, your cat is not working well. They may have your NO on the report regardless of whether or not they use it. _________________ "Use the SEARCH, Luke" But first visit the Vanagon FAQ!
1990 Multivan EJ 22, Rancho trans 0.82 4th, Small Car front AC, CLKs w/ 215/65-16, homemade big brakes 303mm, Konis, Recaros, etc....
Click to see my ads for Cup holders, Subaru clutch fix and CLK wheels (no wheels currently) |
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Paintedbus Samba Member
Joined: September 14, 2003 Posts: 679 Location: salem, ma
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Posted: Sun Sep 25, 2005 9:25 pm Post subject: |
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i just had the same issues, not to the same degree, but i failed emissions here in CT and had to figure out what was wrong... on my way home a week later, my van stalled because my cat had fallen apart and clogged my muffler. once i got a new one on there (along with a new o2 sensor and emptieed out my VERY full muffler, i passed with flying colors... then again, i also just did do a couple of things, like a tune up, and new muffler... figures that my cat had to go right after i emptied my meeger bank account into a bunch of new asthetic parts for the interior... _________________ Champagne Edition Roadtrip monster "Juakali"
~"Paintedbus" Ken~
The Mobile Muralist
WWW.PAINTEDBUSART.COM |
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shenan-agon Samba Member
Joined: May 11, 2005 Posts: 423 Location: Portland, OR
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Posted: Tue Sep 27, 2005 2:31 pm Post subject: |
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Thanks for the help so far - I did a few quick things (temp II sensor, tried to adjust AFM/CO/idle) and took it back in today...still failing (numbers about the same). I'll look at getting a new O2 sensor, setting up timing, and trying to get the other adjustments better - and I'll look at my cat.
I at least made some improvement to my AFM - the wiper had worn through the carbon track and was giving really erratic signals as it moved across. I cleaned the track and shifted it slightly so it's running across a different section, and it seems to be working better. I have a feeling I may need to tighten up the spring a bit... |
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61 BUS Samba Member
Joined: January 05, 2005 Posts: 692 Location: Tucson, Arizona
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Posted: Tue Sep 27, 2005 5:40 pm Post subject: |
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The CO problem is almost certainly due to a bad catalytic converter. I had a '76 Bug with F.I. and a cataytic converter that had similar numbers (around 450 ppm HC and 2.5% CO). Nothing I did would help the CO emissions until I replaced the catalytic converter. As it turned out, I had a catalytic converter shell with no innards! Once I got the new catalytic converter installed my CO dropped to 0%! Then it was just simply a matter of adjusting the timing and idle to get the HC down. If your engine has a lot of miles on it, you may need to adjust it for passing emissions. What you'll need to do is to retard the timing 5-6 degrees from the recommended factory settings and then raise the idle to maybe 1200 RPM. Then get it tested. In my '76 Bug, I was able to lower the HC emissions from around 400ppm to less than 150ppm by doing this. The car ran like an old Yugo, but at least it passed emissions. |
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Big B Samba Member
Joined: June 24, 2003 Posts: 467 Location: long beach,cal
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Posted: Thu Sep 29, 2005 11:27 am Post subject: |
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Shenan
i just failed with almost the same numbers, I did a parts tune up and had a local shop set my mixtures and then installed a new cat and passed with colors, as in flaming. |
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shenan-agon Samba Member
Joined: May 11, 2005 Posts: 423 Location: Portland, OR
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Posted: Thu Sep 29, 2005 1:52 pm Post subject: |
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Big B wrote: |
Shenan
i just failed with almost the same numbers, I did a parts tune up and had a local shop set my mixtures and then installed a new cat and passed with colors, as in flaming. |
Sounds good...I'm going to try to do the timing and mixture setup before shelling out money on a cat, but I may be headed down that path... |
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