Date: Thu, 17 May 2001 22:50:53 -0600
Reply-To: Steve Blackham <steph@uswest.net>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Steve Blackham <steph@uswest.net>
Subject: Re: emission testing problems
Content-Type: text/plain; charset="us-ascii" ; format="flowed"
Take Mark Kellers advise. Look carefully at the fuel pressure
regulator. Should be at 29#s at idle with vacumn hose on. I flunked
my first test for high HC and a little high CO. I found a bad gasket
in the exhaust manifold Y which corrupted the exhaust CO readings at
the O 2 sensor with air leaking in. It made the O2 sensor think it
was running lean so it would richen the mixture. Fixed that and
replaced the O 2 sensor because I felt it was still reading towards
the lean side. Failed another test this morning but the readings are
a lot closer now (300 HC instead of 800 at idle, CO is now within
specs at 1.01% was 1.5% before. 2500 rpm figures were within
spec)(probably would have passed if my CAT had any thing in it, which
it doesn't. Passed ok last year so, I know its possible with out a
working cat). I have seen this before with one of my Jettas. High
HC due to a injector peeing on a spark plug. Pulled all the
injectors and they seemed to have long cone shaped spray patterns.
The only thing I could find was that the fuel regulator was reading a
little high at idle -- 31 to 33 #s. This makes sense if you think
about it. The problem is only at idle, doesn't effect CO readings
too much, just HC. This equates to a richer than spec mixture at
idle only. Runs great though just can't get it through IM. Ordered
a new fuel regulator from Autozone today. Should be in Saturday and
was a few dollars less than BD.
Let me know what you find
Steve
Original Message
Date: Thu, 17 May 2001 20:10:58 -0700
From: Geoff Wilke <gwilke@livemusic.org>
Subject: Who can we believe nowadays? emission testing problems
I bought this 85 vanagon, the light of my life with real heat and comfort
after my '73, my '65, and my first microbus...I'm finally in heaven. Bought
it about 2 yrs ago from a local minister, the 2nd owner. It now has 21K, new
heads, from the owner's records at 65K, I bought it when it had 80K. It
passed emissions 1st time when I transferred the title. Time for the test
again well I failed the hydrocarbons part of the test, passed the rest.
Yeah...I can expect to get face the engine rebuild, replace, TCI, Audi,
McDonald Douglas MD turbo, but it really runs great. I replaced the ignition
parts because I did not know their history and the compression check shows
135 Lb in cylinders # 1 & 3 and 175 in @ & 4. I don't burn any oil, 1/2
Qt/2K mi. and I don't see any evidence of cooling system leakage. Any
similar experiences? One guy recommends that a new catalytic converter will
get me down to acceptable numbers. Thanks in advance.
--
Steve Blackham
Centerville, Utah
77 transporter converted to camper (Westy top)
83 Vanagon (New and current project)
87 Weekender
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