Miks15
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| posted on 4/1/10 at 03:51 PM |
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no spark... coil or dizzy?
Just tried firing my car up and it turns over nicely, but wont fire...
using an ignition tester thingy i could see i wasnt getting any spark, anyway i can check if its my coil or my dizzy at fault?
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RichardK
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| posted on 4/1/10 at 03:58 PM |
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Cant you try to get a spark just using the king lead from the coil to the dizzy, (the one normally in the middle)?
Rich
Gallery updated 11/01/2011
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Miks15
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| posted on 4/1/10 at 04:09 PM |
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How would that work then? Surely it would just be a constant weak spark because the coil isnt pulsing without the dizzy?
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RichardK
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| posted on 4/1/10 at 04:20 PM |
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But it prove that the coil is functioning though wouldn't it?
Gallery updated 11/01/2011
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bbwales
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| posted on 4/1/10 at 04:21 PM |
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Hi,
Hold the king lead, disconnected from dizzy, and hold it towards earth and turn the engine over you should get a healthy spark.
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IanBrace
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| posted on 4/1/10 at 04:32 PM |
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I'm only a few miles away, so if you've a problem still by the end of the week send me a u2u and I could pop over if you like..
www.aerialphotography.org.uk
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twinturbo
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| posted on 4/1/10 at 08:28 PM |
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Don't hold it with your hand use an insulated pliers.
Better still put a spark plug on the lead, then a jump lead from the plug thread to the negative on the battery.
TT
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Miks15
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| posted on 4/1/10 at 08:41 PM |
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so are we tlaking about just having the coil completely on its own? just connected to the battery +ve and -ve on the coil... then the king lead into a
spark plug, spark plug then with a jump lead connected to the threads on the spark plug and to the negative on the battery?
what will i see, just it sparking?
Many thanks for the offer Ian, but unfortunatly i am working everyday this week, so will only have a few hours in the evening to look at it, and then
i am off to uni again at the weekend. Hopefully i can shine some light on before then.
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twinturbo
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| posted on 4/1/10 at 10:34 PM |
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+12v to the coil, and the negative of the coil to the Dizzy as normal.
Crank and see if you get a spark.
If not,
Take a cable from the negative on the coil and keep taping it against the negative on the battery. That should induce a spark.
If not then try a different king lead.
TT
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Miks15
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| posted on 4/1/10 at 11:35 PM |
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negative of the coil to the dizzy? surely the negative of the coil goes to earth (negative of battery) ??
then the output goes to thedizzy?
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twinturbo
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| posted on 4/1/10 at 11:39 PM |
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Ok, you should have a single wire from the condensor on the dizzy. This goes to the negative on the coil. The coil should not normaly be earthed
directly.
TT
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Miks15
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| posted on 5/1/10 at 12:05 AM |
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there are no wires coming from the dizzy, there are only 5 outlets, one for the king lead, 4 for the HT leads to the spark plug, surely the dizzy
doesnts need earthing? its just transmitting the the high voltage along the HT leads to the plug which is earthed...
at the minute ive had the coil earth on to the engine block
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twinturbo
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| posted on 5/1/10 at 08:57 AM |
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Right, oldsckool dizzys had points that open and close as the rotor arm rotates. This earths the coil to produce the spark.
Later dizzys have electronics to replace the points. Via an ignition amp. ( electronic ignition )
Later still, distributors became ver simple a shaft rotor arm and cap. The spark timing was controled again by an igntion module using timing
information usualy from a toothed wheel ( 36-1 commonly ) and crank position sensor.
Which goes back to my question earlier. What ignition system.
The replys from others saying jsut connect it disregards the many different systems.
If there are no small conectors or wires comming from the dizzy then you probably have a toothed wheel and picup. you will need the apropriate
ignition control. If you have replaced EFI with a carb, then your going to need a third party ignition controler such as megajolt.
TT
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twinturbo
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| posted on 5/1/10 at 09:00 AM |
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Coils work by inducin a voltage in the secondary ( high tension ) wiring. This can only happen with an alternating current. Switching DC on and off
provids this. the points switch on/off the DC.
http://auto.howstuffworks.com/ignition-system4.htm
TT
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Miks15
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| posted on 5/1/10 at 11:11 AM |
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OK sorry tt,
The car was originally EFI, now converted to run on carbs. It has a distributor on the end on the cylinder head, run off the cams i believe. looks
likes this:
Image deleted by owner
I cant see any connectors on the distributor that the coil should connect to?
this is a pic of my coil:
 
i have tried just having the coil connected directly to 12v, but i guess this is where i am going wrong?
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Miks15
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| posted on 5/1/10 at 11:23 AM |
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having a look online i found this:
does this mean im missing the contact braker and capacitor?
I assume that in standard setup this would have been controlled by the ECU?
Is that comething simple i can get?
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twinturbo
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| posted on 5/1/10 at 11:37 AM |
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which engine is it?
Your going to need megajolt or another aftermarket ignition controler.
You will have a crank pickup somewhere or maybe a cam sensor.
Does the front pully have a toothed wheel and a sensor ( usualy 2 pin? )
Sometimes they are on the flywheel. with the sensor either on the back of the block or on the gearbox.
TT
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twinturbo
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| posted on 5/1/10 at 11:52 AM |
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You can see your toothed wheel on the lower front pully.
I think you can make out the crank sensor too.
TT
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Miks15
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| posted on 5/1/10 at 01:53 PM |
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Ok thanks TT, sorry for all the bother!
Right where do i get megajolt then?
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IanBrace
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| posted on 7/1/10 at 03:04 PM |
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If you've had it wired with the coil + connected and earthed for any length of time there's a fair chance of burning the coil out too...
sorry..
www.aerialphotography.org.uk
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twinturbo
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| posted on 7/1/10 at 03:10 PM |
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I was hoping he possibly had not done that.
Especialy if it was a balasted coil which is a posibility..
TT
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Miks15
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| posted on 8/1/10 at 11:05 AM |
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I think i have done that acutally, checking the resistance its only at about 5000 ohms, when it should be abround 10000 i believe?
nevermind ive gone with Edis now so using those coilpacks
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