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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