No spark at plugs?!

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Rhys25

Member
Posts
68
Location
Buckingham
Hi,

I am putting my 2.25 engine back in after a rebuild and i have no spark at the plugs, before the engine seized it was running. I have checked for a spark at the coil by putting a spark plug in the HT lead coming from the coil and earthing it in the engine bay and there is a spark. I have fitted an accuspark electronic ignition module, I have cleaned the contacts within the dizzy cap but when i put a spark plug in the individual ht leads and earth within the engine bay there is no spark, the low tension side of the circuit has 12v and the HT side seems good to the dizzy cap, it is from here that the spark appears to fail. I have added an extra earth strap to the engine just in case it was poorly earthed but that doesn't seem to have made a difference. Any ideas?
 
The gap on a spark plug is quite narrow & not a reliable test that you have enough HT. It would be better to take the king lead from the coil & hold the end of it 5mm from an earthing point. I can get a spark of 10mm but less than 5mm you have low HT.
You need to test the rotor arm, you cannot do this with a multimeter, you need to test it at the voltage it will be running at. Again with your lead from the coil HT hold the end of it 2mm from the metal of the rotor arm whilst is still on the distributor shaft. You should get no sparking at all.
You say the carbon brush is still in the cap, but is it free to move on its spring?
 
I think if I had gone to the trouble of rebuilding an engine, I would have replaced the leads, dizzy cap and rota arm at the least.
Col
 
I think if I had gone to the trouble of rebuilding an engine, I would have replaced the leads, dizzy cap and rota arm at the least.
Col
Leads were new 18 months back, rotor and dizzy cap performed fine before rebuild, i get what you are saying but in my opinion if it ain't broke don't fix it!
 
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