Date: Sat, 23 Sep 2017 17:57:24 -0700
Reply-To: Alistair Bell <albell@SHAW.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Alistair Bell <albell@SHAW.CA>
Subject: Re: AFM cap fix, maybe fixed my very intermittent problem
In-Reply-To: <CAB2RwfivcKq=AUOx7sF9QRQMxrMT=2AHNjfiZaSnxg_q005m1g@mail.gmail.com>
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Neil,
Good points. The AFM Carbon track is ( amazingly )good.
But the throttle switch. What a little bastard that is. I did rebuild the tb early on, rebushed, made new throttle plate, bored throat etc. The tb is tight and good. But the switch has always given me problems. Have swapped in a couple. And I did read that Samba thread at the time and re visited the switch. Seemed ok but I’m not discounting a bad solder joint in there.
But then again the issue hasn’t recurred since early summer. And you know I want to put I4 in the Syncro. Have two candidate blocks in garage, leaning to the 2.0 litre with 1.8 single cam head. So if the cap fix worked for me so far, that’s ok :-)
Alistair
> On Sep 22, 2017, at 11:09 AM, Neil N <musomuso@gmail.com> wrote:
>
> I tend to focus (incorrectly maybe) on whether or not a worn spot on
> the AFM resistive strip is causing a voltage drop out; I tend to
> forget that the real potential offender is most likely oscillation at
> the wiper causing inaccurate values being sent to the the ECU. All
> that said, did you measure your AFM for voltage or resistance drop?
> All that aside, your post reminded me of this thread on the samba
> about a failing throttle switch:
>
> https://www.thesamba.com/vw/forum/viewtopic.php?t=455400&highlight=
>
> Maybe dirt road driving would exacerbate this type of issue?
>
>
> Neil.
>
>> On 9/22/17, Alistair Bell <albell@shaw.ca> wrote:
>>
>> I’m not completely sure that adding the capacitor to the AFM has solved the
>> problem, but so far it looks like it has.
>> Background, for about 5 years I’ve had a very very intermittent running
>> issue with the stock 2.1 motor in my Syncro. Symptoms would be bucking and
>> hesitation when applying throttle. At wot the bucking would stop. At idle,
>> motor ran fine.
>>
>> This only happened on summer trips, mostly rough logging roads. Occasionally
>> it would happen on hwy when returning from rough roads.
>>
>> Sometimes the problem would come and go within a day. Every time the problem
>> would be gone the next day when back in town.
>>
>> Never happened around town, never happened in winter. Never happened on long
>> summer Hwy trips.
>>
>> So it never quite fit the pattern I had read about regarding the classic
>> vanagon syndrome.
>
>
>
> --
> Neil n
>
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>
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>
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>
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