Date: Mon, 21 Mar 2016 12:32:27 -1000
Reply-To: "SDF ( aka ;jim lahey' - Scott )" <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "SDF ( aka ;jim lahey' - Scott )" <scottdaniel@TURBOVANS.COM>
Subject: Re: Vanagon syndrome...it sucks!
In-Reply-To: <56EF5EE3.5030304@cox.net>
Content-Type: text/plain; charset=windows-1252; format=flowed
given that that is an adjustable micro-switch ..
just replacing it does not seem like a good idea right off the back.
I've never seen one fail, just fail to be moved properly by the little
lobe on the underside of the Throttle body.
of course...since no mechanicals are involved like worn TB shaft bushings ..
the electro-pneumatic idle switch seems like the way to go ..
it reads the actual air, not a mechanical position of something that
'should' be related directly to air , but after 25 + years that's often
not the case I would think.
I have about 5 TB's to play with ..some return to zero position easier
than other ones.
There are rebuilt ones available ..should that be related to this
strange issue on this van.
lots of vans are running with non-working or not-adjusted-right throttle
switches and they don't have intermittant loss of power.
of course it's really nice to have things pretty right and very well in
tune.
scott
On 3/20/2016 4:39 PM, vw_van_fan_Mark wrote:
> Before doing anything that costs much money or much time, unplug the
> throttle position switch connector. If it doesn't help, nothing lost. If
> it cures it, order a new switch.
>
> Mark
>
> Jason Ellis wrote:
>> Ok all, I've searched The Samba and tons of other websites for my
>> issue. Maybe one of the gurus here can help.
>>
>> I have typical vanagon syndrome symptoms. Driving on highway for a
>> while, then suddenly loss of power and bucking. Turn off engine,
>> restart and all is good for an indeterminate amount of time. I did
>> notice that just before (10 sec or so) the power loss starts, I seem
>> to have a smoother running engine with a hair more power. I also had
>> the syndrome start and I exited the freeway with very little power. I
>> shifted into 3rd and it chugged a couple of times and the BAM, like a
>> switch was turned on, the van power came back. Drove home another 30
>> min on highway with no problem.
>>
>> I have done the following:
>> 35v 22uF capacitor between 2(+) & 4(-) on harness to AFM
>> New fuel line, pump, filter, tank, and pressure regulator
>> Refurbished, cleaned and flow tested injectors
>> New alternator harness
>>
>> I have not cracked open AFM. I started to, but I didn't want to screw
>> up anything.
>>
>> Any thoughts? Anyone have a spare good AFM I could test out? I hate
>> to spend money on a AFM when I could be sourcing parts for either an
>> engine swap or a Megasquirt setup. I'm at my wits end. I drove about
>> 70 miles on Friday and during a 30mile stretch I had the syndrome pop
>> up every 1/2 mile.
>>
>> Thanks for the help!
>>
>> Cheers,
>> Jason Ellis
>>
>
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