how do I tell is a spark plug lead is failing?

[gbymb]

Hi guys, I've got a recurring problem , where #4 plug appears to foul often. I clean the plug with a rag and a wire brush and it works again. I am blowing a little bit of smoke, when I boot it. But I don't think it's oiling up, seems to be more full of fuel... I'm using iridium plugs . I guess I want to know if a lead was breaking down would it fix it'self if I gave the plug a bit of a clean? and how do I test for a low lead....is there a certain resistance I could expect to see on the lead? any thoughts?

T.I.A.
Mike

[Alfisto Steve]

Quote:

Originally Posted by gbymb Hi guys, I've got a recurring problem , where #4 plug appears to foul often. I clean the plug with a rag and a wire brush and it works again. I am blowing a little bit of smoke, when I boot it. But I don't think it's oiling up, seems to be more full of fuel... I'm using iridium plugs . I guess I want to know if a lead was breaking down would it fix it'self if I gave the plug a bit of a clean? and how do I test for a low lead....is there a certain resistance I could expect to see on the lead? any thoughts? T.I.A. Mike

[gbymb]

excellant! just the info I wanted, I'll get back later with my findings. thanks

[alfasrule]

I had a strange problem with NO 4 as well and believe it or not there was a Mouse Nest in my air cleaner causing no air to get to that cylinder. I looked at everything and never bothered to look inside the air cleaner. When I did I was shocked. Now it runs fine.