Please Help 2 Fried Plugs Now what ?
12-13-2006, 11:38 PM
#1
Please Help 2 Fried Plugs Now what ? Well I have been haveing a Starting issue since the Colder weather has moved in.So I checked my Plugs 1-7 they are all just black soot.I got to number 2 or 4 cylinder(Drop them) and the plug is black soot and mising some of the insulator and the better half of the top hanging over the electroid is gone,Number 6 is got a little piece over the electroid is burnt away.the rest of the 6 are just black Carbon Fouled.This is in a 408 that was just built this spring,No troubles at all until the temps dropped this late fall.What do I do?
Scott
Scott
12-14-2006, 07:02 AM
#2
Sounds like ALOT of detonation has destroyed the plugs. Once that's done, they quit working, and the soot builds up... 
Once all the plugs are out, do a leakdown.
Look at the tune, and the fuel system.
As for the cold weather... Could be the tune was on the ragged edge, and when the denser air came along, the lean condition took it over the edge.
Once all the plugs are out, do a leakdown.
Look at the tune, and the fuel system.
As for the cold weather... Could be the tune was on the ragged edge, and when the denser air came along, the lean condition took it over the edge.
12-14-2006, 04:31 PM
#5
I talked to my Engine builder he said to try to borrow a Bore scope to see if the cylinder wall is ok,But I know No one with a bore scope
He thinks it could have combusted and burnt away over time.
But I will have to drain my oil because I now do Have fuel in it from trying to start it...
He thinks it could have combusted and burnt away over time. But I will have to drain my oil because I now do Have fuel in it from trying to start it...
12-16-2006, 08:30 AM
#6
Staging Lane
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Originally Posted by Pro Mouse
I talked to my Engine builder he said to try to borrow a Bore scope to see if the cylinder wall is ok,But I know No one with a bore scopeHe thinks it could have combusted and burnt away over time.
But I will have to drain my oil because I now do Have fuel in it from trying to start it...
He thinks it could have combusted and burnt away over time. But I will have to drain my oil because I now do Have fuel in it from trying to start it...
A borescope would also be handy in looking at the piston crown to see if it were damaged at all. Were your piston tops coated? That would have minimized the damage for sure and probably help save the day.