Date: Sat, 19 Oct 2013 15:36:14 -0700
Reply-To: Scott Daniel <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel <scottdaniel@TURBOVANS.COM>
Organization: Cosmic Reminders
Subject: Re: Intermittent smoke after stop signal wait...
In-Reply-To: <CAHTkEu+NAVzCxvyh2NLJNX5qhtfsnjMYmEhKJn8gLDH7PCFzNw@mail.gmail.com>
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is it blue are black smoke ?
Worn guides or valve seals is what I'm suggesting right now.
you're not running a cat.
I think that most cars, like 80's and forward, with 02 sensor and cat
can burn oil 'nicely' and not smoke ..
in that the 02 is helping adust perhaps ...for oil burning in the
cylidners ...
and the cat cleans it up. I've seen cars that use a qt of oil in 500 to
1,000 miles and never smoke at all. ..
perhaps lack of a cat is a factor.
I like to have at least looking like it has a cat, since having one on a
gasoline van of that year was stock in all 50 states.
I4 VW engines were well known for valve seals and /or worn valve guides.
On 10/19/2013 9:21 AM, Don Hanson wrote:
> I sometimes see a nasty grey cloud of smoke from the exhaust of my 84.
> Digifant EMS on an inline VW motor. I am guessing it may be a faulty
> throttle switch that sometimes goes to 'full rich' for whatever reason. By
> intermittent I mean....When I go to town, perhaps 1 trip of four, this
> smoke shows up. It doesn't smoke at every signal....It may do so for two
> in a row, then no smoke at all the rest of the driving around. It
> sometimes even smokes breifly on start up, but very seldom...
>
> Here are the specifics of how this occurs and when: It normally happens
> in the city when I am stop and go driving or hitting traffic lights.
> Everything might be normal without any problem then I will roll up to a
> signal and idle there while the light cycles then as I leave, the van puffs
> out an embarrassing cloud of grayish exhaust smoke, lasting perhaps two
> seconds before the exhaust clears back up and is again invisible. I have
> also noticed that on start up, then coasting down a longer hill the exhaust
> will backfire....I do have an air leak in my exhaust system which probably
> allows air in to make the loud bang more likely...
>
> I see no smoke on long hill descents. Nothing when I redline the motor
> to 6000rpm. I don't burn much oil for a VW inline, but I do have a slight
> leak at my homemade filler when I park with the nose up on a steep
> incline...a quarter sized puddle below maybe.
>
> I think my throttle switch is NLA...I think it is the longish leaf
> springy looking type...It seems to click correctly with linkage movement
> and it clicks off when the throttle is closed...when I do it in the engine
> by hand...consistently and correctly..
>
> Anybody have any other ideas about this stinky cloud of smoke I sometime
> see? I hate puffing that into our air, though it's probably nothing
> compared to, say, a coal fired power plant...a minor 2-second visible
> exhaust puff a few times a week...
>
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