Date: Tue, 24 Jun 2014 22:22:48 -0700
Reply-To: Alistair Bell <albell@SHAW.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Alistair Bell <albell@SHAW.CA>
Subject: Re: Inconsistent stumbling on resume throttle..Was "vanagon
syndrome?"
In-Reply-To: <CAHTkEu+EUm7OCDT=Hy-BH1YXCd2=6NzWUzbj6aex8w1K4RzaAw@mail.gmail.com>
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If you suspect the o2 sensor just disconnect it and see how the van runs. With it disconnected the computer uses internal maps to determine fuelling, and the van actually runs fine.
You can use a meter to measure the output of the sensor too. Dennis just gave an overview of what readings to expect.
The digifant you have is very similar to what the wbx engine uses. Yes, there are places for unmeasured, ie after the afm, air intake.
I replaced my o2 sensor today as it happens. I've done a few over the years and they can be very tough to remove. This one would not come out cold, or engine running hot. But with the oxy acetylene torch on the welded nut insert the sensor unscrewed easy as pie. Quite remarkable how easy infact.
Alistair
> On Jun 24, 2014, at 9:28 PM, Don Hanson <dhanson928@GMAIL.COM> wrote:
>
> Thanks,
>
> Actually now that I think of it, my O2 sensor is probably overdue...I
> think I changed just it once since I've owned the van probably over 50k
> miles ago. I have a spare new one in my 'stash under the bench... The
> connection to that has been drenched in oil also from a leak in the valve
> cover gasket that was ongoing for a year...that could well be a very good
> candidate... Now, if I can get that sucker loose...I recall the last one
> was very very stuck in there.....
>
>
>> On Tue, Jun 24, 2014 at 9:22 PM, JRodgers <jrodgers113@gmail.com> wrote:
>>
>> Don,
>>
>> I went through this with my 88 GL and 2.1L WBX and the Digifant FI system.
>> Would run along fine - then start chugging and lugging - turn of then back
>> on allowing the ECU to reset - and it would be fine for a little bit - then
>> it would start again. Unplugging the O2 sensor took care of the problem. In
>> time - a new O2 sensor eliminated the problem altogether.
>>
>> John
>>
>>
>>> On 6/24/2014 10:06 PM, Don Hanson wrote:
>>>
>>> I queried "what was Vanagon Syndrome" a few days ago
>>>
>>> This is a case where that OBD system might be helpful...one of the few
>>> times my Vanagon has misbehaved in a way that is not simple to deduce the
>>> problem and fix it.
>>>
>>> I think my Vanagon is jealous. I recently got a Safari Van for work.
>>> That has been getting a lot of my attention lately as I go over everything
>>> and actually drive it to work sometimes.... The Vanagon, which until now
>>> has been Old Dependable, is telling me..."Dude, pay attention to ME...or I
>>> show YOU..." or sumpthin like that...grin.
>>>
>>>
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