Date: Mon, 17 Aug 2009 14:34:45 -0700
Reply-To: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Subject: Re: Not quite a backfire . . .
In-Reply-To: <4A89C87D.1090802@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hey Rocky, I've had my ankles frozen in the wintry blast of downhill engine
over-run too! =) It happens in injected Hondas and Toyotas too.
My solution in some (colder) circumstances is to put the gearbox in neutral
so that the engine's idling and making us SOME heat but with bigger loads
and steeper grades we just freeze for a little while...
With an automatic you might keep your foot a little bit on the gas to keep
the throttle switch open if you wanted to retain heating capacity.
I wouldn't worry about the coughing backfire - its just an artifact unless
you're running 76 in your van, in which case its an allergic reaction. I've
tried 76 in 3 different Vanagons and each one has done some missing at
highway speeds. =)
On Mon, Aug 17, 2009 at 2:15 PM, Rocket J Squirrel <
camping.elliott@gmail.com> wrote:
> Idle's one thing -- that's the responsibility of the idle speed controller
> dingus, pretty much.
>
> But when the engine is being spun by outside forces (say, downhill in
> gear), then foot off gas = zero fuel. It's in the Bentley's somewhere.
> Manual's not at hand but I did look at that and post it here late 2007,
> early 2008.
>
> TI think that there is at least one throttle body switch + rpm condition
> not well explained in the Bentley's manual. List members hand-waved that
> off by saying that the ECU sees the Hall sensor and does some ju-ju with
> the data. But we don't like black boxes.
>
> --
> Mike "Rocket J Squirrel" Elliott
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> Bend, OR
> KG6RCR
>
> On 8/17/2009 1:52 PM pdooley wrote:
>
> Hmmm, I may have an answer for my own question.
>> The hall sender could detect RPM below or approaching idle speed and add
>> fuel.
>>
>>
>> -----Original Message-----
>> From: pdooley [mailto:psdooley@verizon.net]
>> Sent: Monday, August 17, 2009 4:45 PM
>> To: 'Rocket J Squirrel'; 'vanagon@GERRY.VANAGON.COM'
>> Subject: RE: Not quite a backfire . . .
>>
>> How does this work?
>> How does the ECU know to shut fuel completely off when descending but yet
>> could add fuel in a split second to prevent stalling if say, you press the
>> clutch pedal in?
>> The idle switch cannot discern the difference between idling and coasting
>> in
>> gear.
>> I really don't see how the AFM could perform this function either.
>> Somebody enlighten me.
>>
>>
>> <With no pressure on the gas pedal, the fuel is totally shut off, so the
>> engine is not firing on any cylinders.....
>>
>>
>>
--
Beverley Anne de Villiers April 20, 1930 - July 4, 2009
Jake
1984 Vanagon GL
1986 Westy Weekender "Dixie"
Crescent Beach, BC
www.thebassspa.com
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27
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