Date: Tue, 14 Jun 2011 21:45:03 -0600
Reply-To: Ken Wyatt <57skibum@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Ken Wyatt <57skibum@GMAIL.COM>
Subject: Re: The Dreaded Emissions test
In-Reply-To: <BAY152-ds5F4B3559AB4D634C79315A0690@phx.gbl>
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After a day of messing around with timing. mixture and idle rpms and
such we're still borderline compliance. O2 sensor is checing out so
we are leaning towards the catalytic converter being the culprit.
I'll have to check on the Compression and leak down as I don't have
that data.
Kw
82 westy
On Sun, Jun 12, 2011 at 9:02 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
> NOx emissions are the result of heat, pressure, and excess O2. As such
> testing requires the engine to be loaded. That is why some areas use the
> dyno as this is the only way to test for NOx emissions. Now for CO and HC
> here is some diagnostic information.
>
> CO (carbon monoxide) is the result of incomplete combustion due to O2 not
> being combining with the fuel, usually caused by a rich mixture or poor
> vaporization and mixing.
>
> Excessive HC (hydrocarbons) is the result of fuel that never got ignited or
> escaped before the burn was complete. Although with good ignition and
> mixture the burn should finish in the catalytic converter or exhaust. This
> is why many cars have air pumps or other means to get air into the exhaust.
> The usual causes of high HC are "lean Misfire", bad valves, pistons,
> ignition miss, or ignition timing way off.
>
> If your van does not have an O2 sensor for final control you should be
> adjusted somewhere near 1% pre cat at idle.
>
> With the engine being fairly new I have to ask if it was tested as part of
> the installation? Has the engine operation changed at all? Maybe it wasn't
> right from the get go. The high idle is a sign things were not set up
> correctly.
>
> As part of the trouble shooting process and to make sure the engine is good
> you need to get a compression and leak down test performed. These engines
> are known for valve and head seal issues. The heads not sealing to the
> cylinders are often the result of the cases being worn or distorted.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Ken Wyatt
> Sent: Sunday, June 12, 2011 12:26 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: The Dreaded Emissions test
>
> Opps sorry I somehow deleted the results of the second test on a very
> warm engine. It still failed after freeway driving. HC was still
> over the max of 220 at 437 PPM versus 469 PPM cold. CO was 2.83% cold
> and 1.577% warm. The CO2 on the first test was 12.94% and O2% was
> 1.46% at 2500 RPM. At Idle it was CO2 at 11.37% and O2 at 2.07 %. It
> appears we don't check NOx anymore here in Salt Lake.
>
> I had always heard that the older VW aircooled engines were designed
> to run slightly rich to enhance engine cooling. Anyone care to
> comment on that. My mechanic is an old VW guy from way back and I
> feel he knows the engines. He completely built it last year with new
> heads and all. So i am having him take the first look at it this week
> while I'm working, hoping its just a small adjustment. Will report
> back.
>
> Cheers,
> Ken Wyatt
> 82 westy
> Thinking of mounting my 1976 Lincoln Continental Mark IV's large
> chrome grill onto my 82 Westy, as soon as I add a radiator for the
> 460. It fits the front vanagon contours well.
>
> On Fri, Jun 10, 2011 at 12:42 PM, Ken Wyatt <57skibum@gmail.com> wrote:
>> 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
>>
>
>
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