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Date:         Fri, 20 Jul 2012 23:40:53 -0400
Reply-To:     Pat <psdooley@VERIZON.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Pat <psdooley@VERIZON.NET>
Subject:      Re: Emissions: Vacuum Leak ID'd 82 aircooled westy
Comments: To: Ken Wyatt <57skibum@GMAIL.COM>
In-Reply-To:  <CACynUEN451dKtGgYe5YU7BWPLioT7WsiOy8cFz0Z_iaM08v1cg@mail.gmail.com>
Content-type: text/plain; charset=US-ASCII

I'm having trouble with the high HC and vacuum leak. The vacuum leak will allow un-metered air to enter the engine. This should drive the mixture lean, not rich. HC should be low. Only exception would be for a lean misfire, which would dump raw fuel. Can you hear or feel the engine missing? You may want to check the injectors. Also check spark energy with a spark-gap tester and check your plugs/wires/cap/rotor.

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Ken Wyatt Sent: Wednesday, July 18, 2012 4:05 PM To: vanagon@GERRY.VANAGON.COM Subject: Emissions: Vacuum Leak ID'd 82 aircooled westy

Greetings Vanagonauts,

I've been having trouble meeting the hydrocarbon standard on my AFC 2.0 l aircooled engine here in Salt Lake City, UT. Its a fairly new engine with only about 6000 miles. It's hydrocarbon output is about 4 times higher than it should be at 800 ppm instead of 220 ppm or lower., The emission guy said he thought it was a vacuum leak near the right head looking forward. (He sprayed carb cleaner around the engine I guess) So in my efforts to achieve emission compliance, I have isolated a slight vacuum leak at the #4 intake manifold right at the cylinder head. It revs slightly when I hit it with starting fluid. I tried to simply tighten the intake manifold bolts a bit but that didn't do the trick. I'm wondering if others have had such a leak and would new gaskets likely solve this issue or is it perhaps more complicated than it appears like as warped head or something.

Thought?? TIA Cheers Ken Wyatt 82 westy SLC, Utah (where emission stds rival CA I think!)

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