[T3] Mystery Miss

[William J]

 Just to rule out power lost intermittent at wire 15 at the coil you could 
run a wire to wire 15 at the coil up to the dash where you can see it . One 
end of wire 15 to a 2 wire 12 volt bulb socket and the other wire from that 
socket to any good ground . I say a light so it will be lite with power to 
the coil and off with loss of power.

 Nothing fancy just run it through the engine lid so it won't get pinched 
and over the rear seat back between the front seats and hang the socket over 
a dash knob . Any 12 volt 2 wire socket and bulb would work . Even radio 
shack or a parts store 1156 bulb or and 12 radio shack socket with 12 bulb .

 It will tell you if the power to the coil is lost . The backup light is 
also tied in at wire 15 at the ign coil and it's fused perhaps check there 
to see if the wire is not shorting between the coil wire 15 and the fuse S1. 
Fuse S1 will only blow if there is a short to ground between the backup 
light switch to the backup lights . Fuse 8 in the fuse box fuses wire 15 
also if you look at the schematic you will see the ign switch wire 15 
connects to the bottom end of fuse 9 which is tied to fuse 8 by a copper 
strap , at that point the bottom of fuse 8 then feeds the coil and J16 power 
supply relay to the fuel injection system . Notice the bottom side of the 
fuses are not fused it's the tops of these fuses that break contact if there 
is a short. mainly to the emerg flasher and headlamp switch. Point is if the 
lights always work and E flasher then the tie between fuse 8 & 9 is fine . 
All it does is supply power to 2 fuses . If you lose power to the wipers 
then suspect the bridge tie between bottom of fuse 8 & 9 and if so will kill 
power to the coil and power relay for the fuel injection .

 Try the bulb at the coil and if you suspect the tie between the bottom of 
fuse 8 & 9 you can connect a jumper between them to bypass that internal 
fuse box copper strip . JUst do one and if no diff then try the jumper . I 
think I recall you having issues with that power relay before. . Try it and 
see it will tell you a lot . I also know you had water in the fuse box . I 
can't recall exactly what is used to tie the bottom of fuse 8 & 9 together 
think it's copper strip fixed between the two and may be a rivet to secure 
it to the each fuse holder . Take a look and you can see just what it is. 
It's quite possible if it's that connection you would loose power to coil 
and power relay to fuel injection at the same instant and the wipers.

William

 I know you have a new wire harness and have checked everything else under 
the sun .

William
----- Original Message ----- 
From: "Daniel Nohejl" <d.nohejl at gmail.com>
To: <type3 at vwtype3.org>
Sent: Friday, May 06, 2016 3:03 PM
Subject: Re: [T3] Mystery Miss


> Well, so far I’ve checked the resistance of the spark plug wires. All 4 
> are between 1000 and 1100 ohms. The wire from the coil to the distributor 
> is 650 ohms. The coil (Bosch black) is 3.2 ohms from + to - and over 10k 
> from center to + or -. The 10k seems a little high as the blue ones always 
> come in between 7k and 8k but I don’t know if that’s an issue. There’s no 
> oil leaking from the coil.
>
> I made no changes before driving home and of course there wasn’t a single 
> miss or buck. I even went out of my way to push it up hills and push the 
> acceleration. So infuriating!! I guess like Bob said I’m going to have to 
> look elsewhere. But where? Or am I still in the realm where an ignition 
> issue is possible….though at what point in the system? Intermittents are 
> such a drag.
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