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Mercruiser 4.3L 262 1994 intermittent spark.

S

Steveevans

New member
Hi

i have just finished rebuild my boat engine and am now trying to get her running.

The engine turns over and firer but run really rough. I have to keep the choke pretty much shut.

Today I attempted to set the timing using a timing light and notice the patten was irregular on cyinder 1. I attach the timing light between the coil and distributor and notice I was losing the spark after about 20 seconds It would sometimes come back and other time just stall the engine.

I disconnect the grey cable to the tact and the white / green from cut out switch and the same thing happened.

Anyone got got any ideas what could be causing this to happen?

How can can I test the ignition sensor ? coil? And the ignition module?


Its it's almost like something is shorting to earth causing the ignition module to shut down.

I thank you all in advance for your help

cheers


Steve
 
Last edited:
Check all your grounds on all electronics",mounting points" for bad contacts also. Check all wiring harnesses for security and possible corrosion inside
 
johnnygjr said:
Check all your grounds on all electronics",mounting points" for bad contacts also. Check all wiring harnesses for security and possible corrosion inside
Click to expand...

Thanks for you advice. I will try this tonight. If the kill cord connection was playing up would this cause the module not to spark?


Cheers

Steve
 
so today, I checked all the earthing point and the highest reading I got was 0.3ohms. I then disconnected the pulple wire from the ignition coil and installed a fused direct freed from the positive of the battery. (So, powered the ignition circuit direct). I am still getting intermittent spark from the coil to the distributor.

What would you guys check next?

Cheers

Steve
 
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