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UK_Sub
V4 Guru

United Kingdom
2322 Posts

Posted - 22 Aug 2021 :  15:31:19 Show Profile Reply with Quote
What is the earthing like on a Sonett? I assume it's on the chassis somewhere, might be worth checking?
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GeoffC
V4 Fanatic

United Kingdom
495 Posts

Posted - 22 Aug 2021 :  17:27:42 Show Profile Reply with Quote
Yes the earth from the engine goes onto the inner wing same as a 96. I have tried putting extra earth wires across from both coil and dizzy but no difference.
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Derek
V4 Guru

United Kingdom
2041 Posts

Posted - 23 Aug 2021 :  12:06:00 Show Profile Reply with Quote
I read that the Accuspark system had circuitry that protected it against miswiring the + and - wires. This kills a Pertronix. If that isn't the case you may have killed the Accuspark somehow. The Petronix dies as soon as you switch on the ignition but the Accuspark may have survived long enough for you to have got one flash as you saw. Might be worth talking to them.
The coil body doesn't need earthing, although the bracket does just that if the case isn't painted. Extra earths on the dizzy not needed either. If you Low tension wiring is via a bolt with various insulating washers. make sure they insulate/isolate so that the they don't short to the body. Also make sure that the spring doesn't touch the body when clamped by that bolt. I have had that happen. Bolt form points/module plate most be short. a longer replacement can short or jam the advance mechanism. With points you should get a very small spark across them when you flick them with the ignition on. A big spark indicates a dodgy condenser. Make sure the condenser is earthing properly to the dizzy, especially if you've given it a coat of paint. The length of the attachment screw is important too as it mustn't protrude inside the case.
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GeoffC
V4 Fanatic

United Kingdom
495 Posts

Posted - 23 Aug 2021 :  13:54:20 Show Profile Reply with Quote
Thanks Derek I'm pretty certain the Acuspark is wired correctly, it does warn you that it will burn out if wired the wrong way. I'm hoping that once the points arrive it will be easier to check everything, as you say I should see the spark. Hoping that they will arrive Thursday so will update again then. It's really annoying especially so with my other Saab off the road waiting to have springs made as you can't get the 9-3x 2.0T wagon ones anymore!
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GeoffC
V4 Fanatic

United Kingdom
495 Posts

Posted - 24 Aug 2021 :  13:31:52 Show Profile Reply with Quote
Points arrived a day early!! But smashed in the post, bag half ripped open and points bent out of shape - the job is doomed!!! #128544;
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john-ayr
Starting Member

4 Posts

Posted - 30 Aug 2021 :  21:13:36 Show Profile Reply with Quote
Greetings,---a new member from the West of Scotland.
I have followed this topic with some interest as I have a 96 that runs on an Accuspark system.
It covers about 10 miles, starts to back fire, and stops. If left it starts up again.
I have fitted 4 replacment units all returned to Accuspark, none of which would fire up at all!
I wonder if they have had a bad batch in some way.
Am now stuck with my "10 mile" unit,--hope someone can help.

I have replaced the coil.

Regards Ayr-John.
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chris steeden
V4 Fan

United Kingdom
147 Posts

Posted - 31 Aug 2021 :  09:21:25 Show Profile Reply with Quote
Sounds like it could be rust particles in the fuel tank. My friend had the same with his 96. He had to remove the tank and cut a panel in the top and grit blast the inside. Might not be the problem but I would inspect the in-line filter and the diaphragm of the fuel pump just in case.
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chris steeden
V4 Fan

United Kingdom
147 Posts

Posted - 31 Aug 2021 :  13:34:41 Show Profile Reply with Quote
Just had a reply about the fuel tank from my friend. His is a two stroke model but he thinks that the tank and line is simular. He has an electric S.U. pump in his engine bay.
He sent me a link to what he found and his repair. A few years ago now and the car hasn't faulted since. It showed the same conditions as you have stated, but of course it could be a lot of different things.
http://saab-v4.co.uk/speedball/topic.asp?TOPIC_ID=2804
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john-ayr
Starting Member

4 Posts

Posted - 31 Aug 2021 :  14:14:19 Show Profile Reply with Quote
Chris,
many thanks for your reply. My car is an ex rally car that was completely rebuilt.-Has a Facet pump,-- filter looks O.K. Must check whither the guy who built the car had a look at the tank.
Thanks again.
regards, john-ayr
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GeoffC
V4 Fanatic

United Kingdom
495 Posts

Posted - 31 Aug 2021 :  17:53:06 Show Profile Reply with Quote
Any pics John, would be interested to know which rally car you have got.
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GeoffC
V4 Fanatic

United Kingdom
495 Posts

Posted - 31 Aug 2021 :  18:06:50 Show Profile Reply with Quote
Update - got a super fast delivery from Steve at Malbrads, new points, plugs, cap and rotor arm. However in my haste to try out the points I stupidly wired them to the positive side of the coil!!! Don't ask me why just a moment of madness - anyway I watched them melt - what a wally!!!
However in spite of the melted nylon and burnt insulation once wired correctly to the -ve side of the coil I got a response from the strobe so at last a spark!! However they were too badly damaged to get the timing right so another phone call to Steve was going to be needed! Worse was to come, as on removing the points I dropped the screw which bounced on the garage floor out onto the road. It's a dead end so sees little traffic however the Law of the Sod was very much present that day as just as I was about to retrieve said screw a car came past, picked it up in it's tyre tread and disappeared into the distance .
Only one thing left to do shut the garage up and get a stiff drink!

Fortunately Steve is sending me a screw together with his last remaining points set.
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john-ayr
Starting Member

4 Posts

Posted - 31 Aug 2021 :  20:07:55 Show Profile Reply with Quote
GeoffC,
the car was owned by Gavin Chisholm who lives quite near to me. I bought it just before lock-down so no chance to use it.
Will try to post some pics. Am a ludit with computers,so may not manage.
I have a feeling to go back to points like yourself.

Regards John.
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GeoffC
V4 Fanatic

United Kingdom
495 Posts

Posted - 31 Aug 2021 :  22:29:14 Show Profile Reply with Quote
Hi John I know Gavin and you have got yourself a very well prepared rally car there.
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GeoffC
V4 Fanatic

United Kingdom
495 Posts

Posted - 31 Aug 2021 :  22:50:34 Show Profile Reply with Quote
John, ditch the Acuspark and try the points, hopefully that will help. Unlikely to be a fuel problem as I believe that car has a bespoke tank. Let us know how you get on.
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Derek
V4 Guru

United Kingdom
2041 Posts

Posted - 01 Sep 2021 :  13:09:19 Show Profile Reply with Quote
I'd be interested to know why the "points" melted. With standard ignition the car should run but not optimally if the + and - wires are reversed. This is LT, it shouldn't have the power to melt anything.
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