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Engine Only Runs With Ignition Switch Held On


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#1 T.Dog

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Posted 17 April 2017 - 09:36 PM

So I've recently pulled my mini out after a few years but she wouldn't start.

Long story short I got her running but only when the ignition key is held in the start position. (starter motor spinning with engine)

Before I go and buy a new ignition switch is there anything else I should check for? Theres a constant 12v to the coil.

Thanks, T.

#2 Wim Fournier

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Posted 17 April 2017 - 10:13 PM

It's obvious that you have a two way current circuit to your coil. When you apply the starter mode with the schwitch key, there is going 12 volt to the coil. And when you let loose the key there should go 9 volts via a 'resistance' line to the coil. This circuit is broken obviously.



#3 Boycie

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Posted 17 April 2017 - 10:25 PM

Yes, as above- the pink wire to the coil isn't connect/ is broken/ or the ballast resistor itself is broken or faulty.



#4 T.Dog

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Posted 18 April 2017 - 06:56 PM

Cheers dudes, so I should be chasing this resistance line for shorting and don't need a new switch?

#5 Boycie

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Posted 18 April 2017 - 07:07 PM

Yes, trace the wire back.  The resistor itself is an inline ceramic item, they can and do break, either from physical damage or if they get wet etc.



#6 cal844

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Posted 18 April 2017 - 07:20 PM

Yes, trace the wire back.  The resistor itself is an inline ceramic item, they can and do break, either from physical damage or if they get wet etc.


On a mini the wire itself is the resistor ;)

#7 dyshipfakta

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Posted 18 April 2017 - 07:20 PM

Yes, trace the wire back.  The resistor itself is an inline ceramic item, they can and do break, either from physical damage or if they get wet etc.


Is the resistor not the pink and white wire itself?

#8 T.Dog

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Posted 18 April 2017 - 07:21 PM

Thanks for your help Boycie :-)

#9 T.Dog

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Posted 18 April 2017 - 07:22 PM

So I'm not looking for a ceramic object? The coil is non ballast...

#10 Boycie

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Posted 18 April 2017 - 07:22 PM

I thought there was an inline resistor?  A ceramic-cased piece of wire?  Sure I broke one once?!

 

Have you checked voltage at the pink/ white wire t.Dog?



#11 Boycie

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Posted 18 April 2017 - 07:23 PM

Edit- non ballast?  What year is the car?



#12 T.Dog

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Posted 18 April 2017 - 07:39 PM

It's a Metro engine setup with the factory electronic ignition. No I haven't checked the pink wire but when I move the key between on and start the tacho needle flicks round... Not sure if this would indicate a duff earth?

#13 T.Dog

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Posted 18 April 2017 - 07:40 PM

Or the ignition switch is faulty?




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