[T3] Mistery Miss

[William J]

 From everything I've read about Dan and Neena's 69 SB with 4 speed I see 
one issue creep back into focus which is the bucking . Since it's 
intermittent this is why I brought up using a wired in test lamp from wire 
15 on the coil with the light up front or a 12 volt buzzer and on second 
thought fuse the Ign lead end since the power begins there and Dave brought 
up the ign is not fused. I knew that yet felt if it was installed with care 
no issues would crop up.

 The wiring diagram is not that complicated and this test would rule out not 
only the coil losing power it would also rule out the power relay for the 
ECU which is fed off the same circuit. Since the wiring is quite old at this 
point it would make sense to at least fuse from the  ign switch to coil even 
though it's not done at the factory it could prevent a wire meltdown even 
though the wires reside in a casing from the fuse box to the engine there is 
no protection under the rear seat and not much in the engine bay to the coil 
. Just say an 8 amp fuse so it's easy to get at under the dash.

 I never believed in tossing parts in hope of finding a problem . You work 
from the wiring schematic , get familar where the wires run and find a 
likely spot of failure.

 Since it's intermittent the only way is to monitor a circuit while driving 
since the system is very old school you need to be creative to test 
intermittent electrical faults. Need to understand voltage drops and 
resistence and connections.

 I am far from new at this 50 + years of working on automotive electrical 
systems and locating shorts and knowing what a faulty ground acts like and 
most of all locating intermittent issues .
 Perhaps if all here who are trying to help Dan and Neena got on the same 
page it would lend to far less confusion. Just my 2 cents.
----- Original Message ----- 
From: "Jim Adney" <jadney at VWType3.org>
To: <type3 at vwtype3.org>
Sent: Sunday, May 08, 2016 9:02 AM
Subject: Re: [T3] Mistery Miss


> On 8 May 2016 at 9:49, Gary Forsmo wrote:
>
>> Jim .... does any of this "in depth" ENGINE MISS discussion have any
>> relevance or shed any solutions to the problem(s) with my engine?
>
> Probably  not. There are so many possibilities that picking one from
> our past is like shooting ducks in the dark.
>
> I'm not a fan of the, "Let's replace this part, because sometimes
> they fail," school of troubleshooting. That's just a way to maximize
> your expense. There are almost always ways to do some kind of testing
> that either confirms to eliminates possibilities. Testing leads to
> better understanding and minimizes costs and labor.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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