I'd even go one step further and recommend changing the engine oil and
filter immediately before going for the emissions check.

>From: Dennis Haynes <dhaynes@OPTONLINE.NET>
>Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Not passing smog, still... Need help!
>Date: Tue, 20 Aug 2002 22:52:52 -0400
>
>The low CO reading is a bit low but this may be a sign the cat is
>working. The fact that you have excessive HC at idle indicates a either
>a "lean miss-fire" or a valve problem. The lean miss fire may be caused
>by an out of tolerance injector or a small vacuum leak. Excessive carbon
>deposits on the valves may also be a problem. Most idle tests will allow
>you to idle the engine up to 1,100 RPM. Turn the idle up to about 1,000
>RPM. This will help even the mixture across the cylinders, allow more
>air to reduce the HC and help eliminate the lean miss. It will also help
>to drive the van on the road and then immediately get it onto the test
>machine. You probably only have to get the HC below 200 at idle to pass.
>You are very close. Also make sure that the oil is fairly clean, correct
>viscosity, and not over-filled. Hope this helps.
>
>Dennis
>

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