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Weak Spark With Electronic Ignition


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#1 Broomer

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Posted 02 September 2008 - 07:27 PM

Metro leccy dizzy. standerd non ballast coil and new plugs. decent leads.

really weak spark, the engine will not even fire up.

how often does the module on the side of the distributer go wrong?

what else could be wrong?

#2 Broomer

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Posted 02 September 2008 - 08:15 PM

And does any one have a module kicking around i could buy? mini spares are out of stock

#3 dklawson

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Posted 02 September 2008 - 08:31 PM

Before you give up on your module, what else has changed recently? Have you replaced the spark plugs, the plug wires, or the plug wire terminals?

Generally, one (1) of those components needs to be resistive to suppress radio noise. It's very common to forget and use resistor plugs with resistive wires. If you make your own plug wires you can also use the wrong terminals (some have resistors built in). Measure the resistance between the distributor cap end of the plug wires and the center (firing) tip of the spark plugs. You should find something perhaps around 5000-7000 Ohms. If you find something over 10,000 Ohms you may need to replace one of the three components I mentioned as the total series resistance will be high enough to weaken the spark.

#4 Broomer

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Posted 02 September 2008 - 08:33 PM

I had the head off. put it back on and a weak crappy spark? dried a differnt coil and its no better.

#5 m1n1

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Posted 02 September 2008 - 08:40 PM

think i got mine from partco a few years back. If you take a trip to the breakers you will find them on all sorts of vehicles - range rovers, maestros, both A and k series engined metros.
Ive had a few problems in the past with them, now put it down to iffy wiring.



also - resisted leads with resisted plugs lead to a weaker spark, might be worth checking.

#6 Broomer

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Posted 02 September 2008 - 08:43 PM

ive tried all the components it had before i took it apart, i had all new stuff to fit any way so i fitted them after it wouldnt start. im guessing it could just be coincidence it died the day i took it apart?

i didnt know k series metros shared the same module. ill try that one evening.

#7 taffy1967

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Posted 02 September 2008 - 08:43 PM

You can get a module from Somerford Minis.

#8 Broomer

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Posted 05 September 2008 - 04:06 PM

tried a new module still no luck.

can some one post up a check list of all the things i could check ?

#9 m1n1

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Posted 05 September 2008 - 08:51 PM

maybe ive read ur post a bit wrong; but shouldn't you have the electronic ignition coil rather than a standard type?

are you getting power to the coil?
are the wires properly connected into the plug that goes into the module?




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