Date: Sun, 9 Jan 2011 12:02:04 -0800
Reply-To: "Todd.Last" <Rubatoguy@COMCAST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "Todd.Last" <Rubatoguy@COMCAST.NET>
Subject: Re: Failed emissions testing
In-Reply-To: <BAY152-ds15C516E82D9A2E38556A01A0040@phx.gbl>
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It is both an idle and 2500rpm test.
Thanks for the tips!
Todd
On 12/30/2010 9:04 PM, Dennis Haynes wrote:
> Over the years I have responded to emissions issues many times. There should
> be some good info in the Archives.
>
> I am assuming this is only an idle test. It makes a huge difference if this
> is a 2,500 rpm test.
> The 1.43 CO tells me the O2 sensor or circuit is not working or so many
> other things have been tampered with/miss adjusted that it cannot
> compensate.
>
> The O2 sensor circuit should regulate the mixture around .5 CO even before
> the Cat. This alone will also bring down the HC. If the CO was within normal
> limits then excessive HC could be the result of an ignition miss, incorrect
> timing, idle speed, or a valve/engine problem. If the injectors are slightly
> out of tolerance or the engine has some issue a correct overall mixture can
> result in one or more cylinders running lean causing what is known as a lean
> miss fire. This lean miss will result in excessive CO.
>
> Test the O2 sensor, a digital voltmeter will do wonders here.
> Check timing and idle speed settings. Avoid temptation to advance the timing
> to make the engine smoother or more responsive. The advanced timing will
> reduce the amount of air/fuel needed for the given idle speed increasing
> both the CO and HC. Cheat just a little on idle speed, 950-1,000 rpm no
> load.
>
> To test the cat have the CO measured before and after. With a properly
> working cat and all other engine issues CO and HC should be near "0".
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Todd.Last
> Sent: Thursday, December 30, 2010 10:49 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Failed emissions testing
>
> I went to have my Westy emission tested today, and it failed the test.
> The van had been sitting for a number of months, and when I first
> started it, It sounded like one lifter was devoid of oil. I let it run
> for awhile and the noise went away.
> I'm not sure, but it looked like the oil was a bit overfilled as well.
> Anyway my numbers were (at idle)
>
> 270 HC (Max allowed is 220)
> 1.43 CO (Max allowed 1)
>
> Any suggestions on what to adjust to try again?
>
> thanks,
> Todd
> '88 Westy
>
>
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