Date: Sun, 5 Jul 2015 01:41:28 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Throttle switch confusion
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The throttle switch has no effect on starting. In fact it isn't even used
until the ecu goes into closed loop operation. If the switch never closes or
turns on it is also not the reason for the stumbling on acceleration.
Something else is wrong.
Dennis
-----Original Message-----
From: "John Rodgers" <jrodgers113@GMAIL.COM>
Sent: Saturday, July 4, 2015 4:19 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Throttle switch confusion
Being as how I'm hung up with this on the weekend, I'm going to do it right.
The switch cover was missing to so I just decided to re-do the thing with
some new parts. No bending the "thingy" will be involved.
I have an ecu monitor, it will be interesting to see how well it works with
the switch. It monitors the switch circuit with a green light at idle, a
green light at wide open, and no light in between those two. What tipped me
off to a problen was that (1) it was hard to start but ran good once
started, but would stumble on initial acceleration, then smooth out.(2) no
green light on any throttle setting.
Come Monday all the parts will be here, plus my new oil pressure and oil
temp kit!
Thanks for the suggestions, Volks. As always, the Vanagon List is the best!
John
On Jul 4, 2015 2:21 AM, "David Beierl" <dbeierl@attglobal.net> wrote:
> At 03:35 AM 7/3/2015, SDF ( aka ;jim lahey' - Scott ) wrote:
>
>> try this ..
>> it's 'cheating' but 'might' get you the result you need.
>>
>> What I've found is even when the allen screw loosens properly, and
>> the eccentric adjusting feature works..
>> sometimes..
>> it still won't adjust to the correct setting. I aim for contact at
>> closed throttle and it uncontacting 'just off' idle.
>>
>
> It runs into two problems -- cam wear to some slight extent maybe, and
> the throttle plate shaft wandering around as the throttle body wears.
> On a new one you can set it by the book. On a worn one you may have
> to adjust as you mention below and you also may have to set it with
> vacuum applied to the throttle body either by running engine or a shop
> vac. You may alsow have to allow for the throttle cable not *quite*
> returning to zero in cold weather when released gently.
>
>
> I've had to bend the little metal tab thingey that the cam pushes on.
>> Like with a needle nose pliers.
>>
>
> That's the operating arm of the switch. It presses on the little
> button/shaft that actually enters the switch and moves the element so
> that it snaps from one configuration to the other. It (the
> Microswitch-type
> switch) is a design of genius, with a stressed moving contact that
> holds on to its existing shape until it's pushed noticeably past
> center, then abruptly snaps into the other shape. It has built-in
> hysteresis, extremely rapid switching action and stable and precise
> actuating points. On this switch it's operated by that little lever
> which is pivoted on little holes in the switch body. Be careful not
> to overstress them when bending the lever.
>
> John's big problem right now is the little adjusting cam has lost its
> means of holding on to a hex key, so he has to remove that cam entirely
and
> move the adjusting plate by hand. And I forgot to tell him he might have
> to bend the switch lever as you said.
>
> Yrs,
> d
>
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