Any chance you can get a two-channel scope and hang one channel on the hall
output and the other on the coil secondary?  Then have someone drive you
around while you watch the scope?

d
At 09:58 PM 7/29/2002, Steven Dodson wrote:
>Further investigation based on leads I have received from all of you has
>netted the following:
>
>1.9L WB w/digifant (1987)
>(note: tests performed per VW factory manual, page 28.39 for coil test,
>page 28.43 for hall sender test and page 28.44 for control unit test)
>
>Coil test: OK
>
>Hall sender unit test: (in bottom of distributor) OK
>
>Control unit test(EC, ECU): OK
>
>However the problem still occurs as it has, speraticaly.
>(2 incidences today)
>I think these tests were intended to be used on a vehicle that isn't
>running at all.
>
>The trouble is I can't rely on the problem to persist long enough to test
>the above. I will load up all the necessary gear and make a try of it.
>
>Q: If you grab ahold of the hall sender jack coming off the bottom of the
>distributor, should it be loose? I would think not, but wiggling it has no
>effect on the problem.
>
>Any new suggestions?

--
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"