Date:         Fri, 10 Jun 2011 14:30:19 -0700
Reply-To:     Roland <syncronicity1@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Roland <syncronicity1@GMAIL.COM>
Subject:      Re: The Dreaded Emissions test
Comments: To: Dennis Haynes <d23haynes57@hotmail.com>
In-Reply-To:  <BAY152-w629F7A9519E897D4BC992EA0640@phx.gbl>
Content-Type: text/plain; charset=UTF-8

Ken,

Dennis' post suggested I should pass on my experience in the past 2 years.
The test would not pass HC at idle, everything else passed.  No amount of
fiddling try-this try-that would get it passed.  Compression test / leakdown
showed a weak exhaust valve.  So, I spent a few hundred $ trying this,
trying that and then had to replace the head anyway in the end.  So please
do the compression test, and then leakdown before you spend too much $
trying other things.

When the engine is turning faster at higher RPM, and compression cycles are
much shorter, means there is less time for the gas (HC) to leak out of the
leaky exhaust valve.  That is why they pass at high RPM but not at idle.
(DRK, BTIWS).  There may be some other problem in your engine, but this was
my experience.

Roland

2011/6/10 Dennis Haynes <d23haynes57@hotmail.com>

> With those numbers he needs to start with compression / leak down test.
> Then look for ignition or lean miss fire. Then basic settings such as
> ignition timing.
> Dennis
>
> > Date: Fri, 10 Jun 2011 15:36:00 -0400
> > From: szpejankowski@GMAIL.COM
> > Subject: Re: The Dreaded Emissions test
> > To: vanagon@GERRY.VANAGON.COM
> >
> > Idle is a bit high as well so I would try to check for vacuum leaks
> and/or improperly closing throttle flap. Then I would adjust the idle and
> idle mixture to spec.
> >
> > Ken Wilford had an excellent write up on troubleshooting idle issues that
> would come in handy. I don't have a link, so Google may be the way.
> >
> > Chris.
> >
> > Wysłane z iPhone'a
> >
> > Dnia Jun 10, 2011 o godz. 14:42 Ken Wyatt <57skibum@GMAIL.COM>
> napisał(a):
> >
> > > Howdy vanagonauts,  I'm having trouble getting my 1982 westy to pass
> > > Utah emissions.  Scary thing is that it has a new (3000 miles)
> > > aircooled 2.0 l FI engine.  I thought it would be no problem to pass.
> > > But NOT!!  I'm failing on the idle HC and CO.
> > >
> > > Last Friday for the first try, the mechanic tested the engine cold and
> > > got HC at 469 (passing is 220 or less), and 2.83 on CO (passing is
> > > 1.2% or less)  The higher 2500 RPM test resulted in HC 203 and CO at
> > > 0.979 % which was passing just barely passing there.
> > >
> > > I figured that it was just the cold engine.  So today I drove it until
> > > it was completely at operating temp quick thoughts on where to start
> > > or what to check?  The engine sounds perfectly VW to me.  The idle is
> > > running about 1100 and I'm wondering if that's slightly high.
> > >
> > > It sure would be nice to go camping but no registration..............
>  No fun!!
> > > Ken Wyatt
> > > 82 westy
>
>