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 Everything is new....but no Spark? Please help!

 Created by: PaulMcDude
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 Posted: Sep 16, 2022 05:10AM
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Hello Gang,
First off, thanks for he help. It seems to me that the control Module for the Crane Fireball Ignition is to blame. I have 12V Power to the coil but no spark from the Center Lead wire.  The module may have gone bad over time. 

For now, I have ordered a new Electronic Ignition from Pertronix ( Mini Mania LU142 ) This unit does not have a separate module and looks a lot cleaner. I'll give feedback when it comes in.

 Posted: Sep 16, 2022 04:33AM
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CA
Ignition points are really a simple switch to turn the coil on/off, so they work on 12V and not much current. When closed, they offer no resistance.
Bluedragon mentions a "ballast resistor". Later Minis had a "ballasted ignition" where, during normal running, the coil (a "ballasted coil) operated on approx 8-9 volts. The voltage to the coil was reduced by going through a resistance wire (or device). A ballasted coil produces the proper output to the spark plugs using the reduced voltage. However, when starting a ballasted car, the ignition switch in the "start" position excites the solenoid, which as a secondary wire leading to the coil. This provides a temporary 12V supply to the coil to provide a hotter starting spark.

If your car was originally a ballasted one, you would need both the ballasted wire from the ignition switch and the direct 12V supply from the solenoid. If you put a non-ballast type coil in, and were only powering it through the ballast wire, it would produce a weak spark.  Or if you were using only the wire coming from the solenoid, you'd only get spark while cranking and lose it once you let go of the key.

You say you get 12V with the key in the run position (ignition on), so that suggests you have a non-ballasted system. In a points system, the points remain closed most of the time, providing a ground for the coil and permitting it to charge. When the points open, the coil discharges, creating a spark. Your electronic system needs to do the same thing. Basically it is either not grounding the circuit at the right time (or at all) or it is not opening the circuit to cause the spark.


.

"Hang on a minute lads....I've got a great idea."

 Posted: Sep 15, 2022 05:45PM
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If the coil works and has energy from the 12v positive, then you need to focus on the Crane unit. Check the wiring. Is the ballast resistor still in place? Isn't there a diagnostic LED on the Crane box that flashes as the engine is being cranked? If there's no flash, then you need to concentrate on what's going on with the Crane box.

If you still have the old points distributor, try putting that back in just to see if it fires. Not sure what resistance the coil has to have to work with a Mini points ignition setup.

DLY
 Posted: Sep 15, 2022 03:34PM
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CA
That kind of points (pun intended) to the electronic ignition having a problem.
Did you check for spark by removing a spark plug to observe if it fires or not?

I am not familiar with a Crane/Fireball system. Is it installed into a Mini distributor body or is it a complete unit like the 123 Ignition System? If it is the first case, it may need an internal ground to the dizzy body, like a points-ignition system.

My first guess is that it may not be properly grounded.

Second guess is the timing is out of phase, e.g. No. 1 firing when No.4 is compressed or something.
How is timing achieved? Using something inside the dizzy or a crank sensor?

.

"Hang on a minute lads....I've got a great idea."

 Posted: Sep 15, 2022 08:52AM
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Update....but still failing:

With the ignition "on", I am getting 12V to the "+" coil.
I am not getting any spark out of the coil to the distributor.

Help!

 Posted: Sep 15, 2022 08:19AM
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Hello,
I am back to fiddling with my mini after a very long break. The car is fully wired with a new loom and the engine now turns over. I am getting fuel to the carbs but I do not have spark to the plugs. Can anyone help me with trouble shooting ?

I have installed:

1) New Crane / Fireball Electronic Ignition System, Model XR700
2) New Pertronix Coil. 3.0 ohm
3) New Distributor Cap, Lead Wires, Rotor, Spark Plugs.

I have bench tested the Coil and can get spark out of it. I cannot seem to get spark once it is in the car.

Please help!!
Thanks in advance,
Paul