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[dan-eboy]

Hi having a few issues with my ignition system, and might understand more if I knew exactly how it works.

For this example lets say it's a coil pack for a 6 cylinder engine and there are 4 wires plugged in. The coil pack works in groups on cylinders 1/4, 2/5, 3/6.  I know 1 wire is a constant 12V feed but what are the other 3? Are they a pulse signal to tell each group when to spark (so like a switch which turns on the 12V feed to each group)?  Or am i completely wrong?  Thanks, Dan
 

[Andy B]

Hi having a few issues with my ignition system, and might understand more if I knew exactly how it works. .....

What 'issues'' are you having? Coil pack generally work or they don't, if you replace it, try to dig deep & buy OE because generic often fail. 

[dan-eboy]

I already have replaced it, along with leads and plugs, I have a misfire still, just really wanna know how it works so i can work out what else it could possibly be?

[Andy B]

...... work out what else it could possibly be?

crank sensor? 

[dan-eboy]

It's possible i guess but theres no spark on 3 and 6 which leads me to think it might be ecu (as coil pack is new) or a wire (if it works in the way i think it does.

How easy is it to change the crank sensor?

[omega3000]

It's possible i guess but theres no spark on 3 and 6 which leads me to think it might be ecu (as coil pack is new) or a wire (if it works in the way i think it does.

How easy is it to change the crank sensor?

http://www.omegaowners.com/forum/index.php?topic=90573.0  This might help 

[dan-eboy]

[/quote]

http://www.omegaowners.com/forum/index.php?topic=90573.0  This might help 
[/quote]

Nice one i know where it is now, But does it have a plug to disconnect, doesn't look like it from the picture?

Also i'm still curious as to how a dis pack works - 'I like to know how something works not just how to fix it'!

[Andy B]

....
 But does it have a plug to disconnect, doesn't look like it from the picture?
 .......

http://www.omegaowners.com/forum/index.php?topic=90552.0

it ain't hard wired to the loom 

[Andy B]

.....
Also i'm still curious as to how a dis pack works - 'I like to know how something works not just how to fix it'!

Mark DTM will probably give a detailed description of current in one coil being cut inducing current in another, but it's far too many moons since I've done any theory in electrickery 
sometimes you need to just accept that some things work because they do 

[RobG]

Quote from MDTM
The coil works by energising a primary winding, this in turn effectively 'stores' energy within the magnetic core of the transformer.
When the current to the primary is removed, this stored energy induces a voltage in the secondary which fires the high voltage through the plugs.

[dan-eboy]

Yeah i only learnt electric stuff as i go along but can understand most things after reading a couple of times!  I really just want to know if it's like i think.  The 1 live wire supplies the current which builds up in 'transformer type things' inside the coil pack, and the other 3 wires send a signal in sequence to 'let out' the current into the HT leads.  Would make sense as there are 4 wires?  But then again I might have it all wrong! 

[Andy B]

Quote from MDTM
The coil works by energising a primary winding, this in turn effectively 'stores' energy within the magnetic core of the transformer.
When the current to the primary is removed, this stored energy induces a voltage in the secondary which fires the high voltage through the plugs.

I was nearly there then Rob ......... something must've stuck somewhere 

[RobG]

Nearly but not quite Andy. Should use a decent "search" facility

[dan-eboy]

Quote from MDTM
The coil works by energising a primary winding, this in turn effectively 'stores' energy within the magnetic core of the transformer.
When the current to the primary is removed, this stored energy induces a voltage in the secondary which fires the high voltage through the plugs.

So am I right?  Each one of the other 3 wires is a 'switch' (for lack of better word) to 'release' the current into each set of 2 leads?  I guess this is a pulse as opposed to a constant current? so not really measurable with a multimeter.

Please excuse my lack of terminology my electronics is a bit rusty!

[Andy B]

Yeah i only learnt electric stuff as i go along but can understand most things after reading a couple of times!  I really just want to know if it's like i think.  The 1 live wire supplies the current which builds up in 'transformer type things' inside the coil pack, and the other 3 wires send a signal in sequence to 'let out' the current into the HT leads.  Would make sense as there are 4 wires?  But then again I might have it all wrong! 

Compared to days of olde, when cars had a single dizzy there was only one LT circuit, as you say there are 3 coils within the coil pack with 3 LT circuits so it sounds reasonable that the 3 other wires are part of the 3 LT circuits with a single shared 12volt supply.