The HallSensor is suspect ForSure but possibly the Cheapest&Easiest
thing to try 1st would be to replace the 2 Relays in the BlackBox
above the coil ~ especially if you don't always get the
FuelPumpWithIgn'KeyOn every time you TurnTheIgn'KeyOn ~ sometimes just
Unplugging&Replugging them will solve the issue but they are Cheap &
if they are the Originals they have already done a MoreThanFairAmount
of work so it sure can't hurt to replace them ~ I've seen them be the
cause of these sorts of symptoms in 3 diff' Vanagons in the past
couple of years ~ It's usually the 1 that controls the FuelPump but I
just replace both & if 1 is still a good one I keep it as a spare.

                                                                                        ORR ~ DeanB

On 22 Sep , 2013, at 8:08 PM, JRodgers wrote:

> As I have mentioned before - I have had a few occasions when after
> shutting then engine off - it simply would not start again
> immediately.
> Had to rest - cool down maybe, before starting again. But the starter
> turned engine vigorously - but won't even fire. Now I am closer to a
> solution.
>
> How so?? - one might ask. Well, an old time very experienced mechanic
> told me once that sometimes things have to get worse before  you can
> figure the problem out.
>
> Well - they have gotten worse. So maybe that means I'm closer to a
> solution.
>
> Now - when running down the road - the engine just simply quits stone
> cold dead for a few seconds - then it will catch and goes for gusto.
> Just a bit later - it will do it again. This is definitely
> electrical -
> and I am highly suspicious of the Hall Sender - although I know an ECU
> could possibly cause this  or perhaps a coil going bad. I know an O2
> sensor can cause a rough running engine - but not this  I don't think.
>
> Anyone else with ideas at this point?? Please feel free to pitch in
> here.
>
> Thanks,
>
> John