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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