Rhys25

Member

• Apr 23, 2017

• #1

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?

 

Dippypud

Never Knowingly Understood

Full Member

• Apr 23, 2017

• #2

Have you checked the dizzy cap ?

 

Rhys25

Member

• Apr 23, 2017

• #3

Dippypud said:

Have you checked the dizzy cap ?

Click to expand...

Ye, it all seems pretty good, I have cleaned all of the contacts in the cap both inside and out, no cracks in it

 

Dippypud

Never Knowingly Understood

Full Member

• Apr 23, 2017

• #4

Rhys25 said:

Ye, it all seems pretty good, I have cleaned all of the contacts in the cap both inside and out, no cracks in it

Click to expand...

Centre carbon still there ?

 

Rhys25

Member

• Apr 23, 2017

• #5

Yep still in place, its got me scratching my head like a good un!

 

Dippypud

Never Knowingly Understood

Full Member

• Apr 23, 2017

• #6

Rhys25 said:

Yep still in place, its got me scratching my head like a good un!

Click to expand...

Check continuity between coil and cap see if rotor arm is short ...

 

Rhys25

Member

• Apr 23, 2017

• #7

Dippypud said:

Check continuity between coil and cap see if rotor arm is short ...

Click to expand...

Thanks for the suggestion Dippypud, I will give it a go

 

J

John S

Well-Known Member

• Apr 24, 2017

• #8

Is the module wired in correctly, something is earthing?

 

fv1620

Active Member

• Apr 24, 2017

• #9

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?

 

C

Colthebrummie

Well-Known Member

• Apr 24, 2017

• #10

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

 

Rhys25

Member

• Apr 24, 2017

• #11

Cheers for all of the suggestions, it is now working brilliantly, the culprit was the carbon brush sticking in place.

 

Rhys25

Member

• Apr 24, 2017

• #12

Colthebrummie said:

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

Click to expand...

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!