Help Keep A Silvia From The Big Scrap Yard In The Sky

nassin obrut · #1 15-07-2006, 22:39

hi guy's my 84 s12 died other day just cut out got told it was the coil got a new 1 still no go then got told it was the dizzy got a new 1 still no go! Then got told that the dizzy aint getting any power to it any clues? took it to lucus they said poss ecu or some switch by the coil. Any1 able to help me as dont want to buy anymore stuff i dont need and cant afford to take it to another garage. Any help would be gr8 cheers peeps Paul v angry s12 owner

PukkaSilvia · #2 15-07-2006, 22:50

i keep reading this problem.I had it on my mk1 when i had an et and never actually solved it

I had an intermittent power signal to the dizzy. In the end i bodged it by putting another 12v ignition feed to it.

It may not be the same cause at all so keep an open mind still

nassin obrut · #3 15-07-2006, 23:48

is that easy to do? do u just run a source straight from the battery?

bigtim · #4 16-07-2006, 01:58

I also had a dodgy wire in the plug that goes to the coil that used to cause it to cut out,i just cleaned it up and tie-wrapped it on tight and it sorted it.

nassin obrut · #5 16-07-2006, 02:27

nice 1 cheers 4 that i will give it a go fingers crossed cos im loosing my rag wiv it now

umpkin · #6 16-07-2006, 08:12

when my mate owned my car, he had a similar prob too (after it had been sitting for a few days), he was driving and it cut out, it turned out to be a mouse nest by the coil, they had chewed through the coil wires.

but could be in the right area, have you a multitester that you can chase back the wiring etc.

PukkaSilvia · #7 17-07-2006, 23:26

Quote:

Originally Posted by nassin obrut

is that easy to do? do u just run a source straight from the battery?

No because then it will be constantly live.

Can someone look at the s12 wiring in the manual and find out if there is an ignition live wire out the ecu that goes to the dizzy?

Dr Silvia · #8 18-07-2006, 18:19

according to the wiring map i have in front of me the power transistor, coil and dizzy (including CAS) take their power straight from the ignition barrel.

the way the diagram is drawn if you have one power supply problem here it could easily affect the lot. think your best bet is do as jon suggested first and make a known good supply of fresh volts for it all

there are 2 wires from the coil/transistor to the ecu
there is 1 wire from the ecu to the power transistor (to control the coil)
and the other is the rpm signal for the ecu and tachometer

the multi connection plug attached that leads to/from the dizzy has 4 wires... 3 of these are the cas, i assume the other is the +ve feed.

There is a tab on the upper side of the dizzy with a push on spade terminal, tbh i'm not sure what that part is

, but ive run it without it connected and nothing monumental happened

and to top it off its not on this wiring diagram

i wouldnt expect this to be the positive feed seeing as the connection isn't secure enough...

theres a guide on doing ecu self diagnosis in the how to section

30psi · #9 18-07-2006, 18:20

Doc

Put an image of the respective wiring diagram up (seeing you've scanned it anyway)