I am really hoping someone can help me as I am pulling my hair out over this problem. I have a 4.3GL Volvo Penta engine with the EST style distributor in my sports cruiser and despite replacing the plugs, leads, distributor cap and rotor all the usual service items I have an issue with intermittent missfires on plug leads number 1 and 3. I have found this while using my timing light, it fires the light consistently and evenly on all plug leads apart from these two, the timing light flash is sometimes regular but often irregular on these leads only!!!).
I found a surprising amount of build up on all the plug contacts inside the new distributor after about 20 hours running and I am also surprised at how big the gap is from the rotor arm tip to the internal cap contacts(what should the be? They are about 3mm on mine!)
Can anyone tell me what I am missing or doing wrong? Could it be a problem with the ignition module inside the distributor? I am getting very frustrated with this problem as the engine starts great, runs OK except for this annoying slight missfire which is stopping it run as smoothly as it should.
Please, please, please put me out of my misery!!!!!!!! Cheers, Simon
I found a surprising amount of build up on all the plug contacts inside the new distributor after about 20 hours running and I am also surprised at how big the gap is from the rotor arm tip to the internal cap contacts(what should the be? They are about 3mm on mine!)
Can anyone tell me what I am missing or doing wrong? Could it be a problem with the ignition module inside the distributor? I am getting very frustrated with this problem as the engine starts great, runs OK except for this annoying slight missfire which is stopping it run as smoothly as it should.
Please, please, please put me out of my misery!!!!!!!! Cheers, Simon