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Ignition

Spark (sparling)noise from spark plug cap

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bhups matharu08/04/2020 12:22:04
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13 forum posts

Hi, I'm getting a sparkling noise from the spark plug cap when I turn the ignition on, this has never happened before..(or I I havnt noticed it).. I'm guessing this is not normal...any ideas?

Regards

Matt

cymaz08/04/2020 12:51:20
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9258 forum posts
1196 photos

Silly question first ( get it out of the way)...Do you have the correct plug for the ignition cap?

  • Is the cap ring still fitting snuggly
  • Loose braiding under the heat shrink, between the cap and ht lead
  • Is the cap damaged or bent
bhups matharu08/04/2020 13:17:11
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13 forum posts

Cap is not damaged in any way same for the braiding.. cap to spark plug is a tight fit.. I can see spark in the spark plug cap when I turn the ignition on, could it be the resistor in the plug wire? I will move everything further away and try again

Regards

Denis Watkins08/04/2020 13:42:24
4459 forum posts
113 photos

Matt, you often have to give a plug cap good smack to engage it fully.

The crackling sound is a gap, as you know between the plug and cap.

john stones 108/04/2020 13:47:03
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11541 forum posts
1517 photos

Sounds like it's loose or there's moisture.

bhups matharu08/04/2020 13:47:45
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13 forum posts

Denis.. the crackling noise is coming from the cap without the plug inserted as soon as I switch the ignition on the sparking noise is there

john stones 108/04/2020 13:51:24
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11541 forum posts
1517 photos

It's definitely loose then. face 1

Is it normal ? no idea, does it work when connected ?

bhups matharu08/04/2020 14:01:15
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13 forum posts

John, yes it works when I connect the cap to the plug.. it's just that everytime I switch the ignition on the spark is there regardless and I cant remember it

Doing that before:-/

Alan Gorham_08/04/2020 14:02:04
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1288 forum posts
145 photos

I don't think you are meant to power up ignition units without the plug in.

john stones 108/04/2020 14:05:54
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11541 forum posts
1517 photos

If it's working o.k, stop switching it on unconnected, jobs a good un.

Simon Chaddock08/04/2020 17:14:40
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5717 forum posts
3034 photos

It sounds like your ignition system charges itself when you switch on.

Of more concern is that the sparking may have now created a carbon 'track' across the inside cap so it now does it more easily than it used to. At some stage (damp conditions?) it could actually degrade or even kill the spark at the plug.

Clean the inside of the cap or to be safe get a new one and never switch on the ignition with the cap removed.

cymaz08/04/2020 17:54:18
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9258 forum posts
1196 photos

Some caps have a spring fitted inside to aid grounding.

bhups matharu08/04/2020 18:05:41
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13 forum posts

Simon, I've opened the cap and cleaned and put it back together, i can still hear the spark when I turn the ignition switch on, plug cap is fully inserted into plug with a tight fit, I'll get another cap and try it tomorrow

john stones 108/04/2020 18:29:52
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11541 forum posts
1517 photos

Apparently ? You can damage the hall sensor, if you turn engine over with ignition on n cap off.

Alan Gorham_08/04/2020 18:30:24
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1288 forum posts
145 photos
Posted by Alan Gorham_ on 08/04/2020 14:02:04:

I don't think you are meant to power up ignition units without the plug in.

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