Tony,
Check the wires going through the distributor housing to the Hall sensor.
The insulation on the wires are known to crack and disintegrate there and
randomly short out, causing the exact symptoms your describe. If you can't
get a new Hall sensor you will need a rebuilt distributor.
Good luck, Steven
--------------------------------------------------

Subject:      1.9 ltr WBX O2 sensor question?

> Hello Folks,
>
> How quickly does the O2 sensor give a signal to the ECU? I notice a
> split on
> the green wire connector to the sensor. I patched it with a new
> connector. I
> noticed that the green wire seem like 2 wires one inside another
> sheet. Does
> that seem familiar?
>
> I am still having problems with what seems to be Vanagon Syndrome. I
> am
> trying to find out why the van will idle fine and smooth for a minute
> or two
> and then miss idle. The timing mark is steady with the split on the
> case
> until a minute or two then it jumps around from the case point and
> then to
> the left (facing the van from the rear) drivers side of the van.

> If driven the van still runs like poo, buck and continues to stumble
>
> The idle then becomes ever so erratic. What could make this mark jump
> like
> so?
>
>> Spark:
>> New spark plugs (double checked the gap)
>> New plug wires
>> New rotor
>> New cap
>> Timed with static light using recomendations on rpm and timing
>> settings.
>>
>> Air:
>> Vacuum lines checked with carb cleaner
>> Little vacuum lines replaced
>> New air cleaner
>> New injector seals
>>
>>
>> Fuel:
>> New pre pump fuel filter (the square one)
>> New fuel lines
>> Pump seems to be humming along
>>
>> Grounds:
>> All grounds to the chassis under coil there checked and cleaned.
>>
>> I am missing something....I just dont know what it is:
>>
>> Plan:
>> Replace temp II sensor
>> Place capasitor on AFM
>> Check O2 sensor
>> Re-time (x100)
>>
>> Thanks,
>> Tony
>> --
>> 82 Scirocco "Rodolfo"
>> 85 Vanagon "El Guapo"
>> 90 Fuji Ace
>