Re: spark plug misses????

Posted by John T on December 30, 2006 at 20:05:50 from (66.244.90.5):

In Reply to: spark plug misses???? posted by jpl on December 30, 2006 at 16:16:38:

jpl, I agree with OLD n the other gents, sounds like you have a plug thats partly fouled out, try a new one bet that will cure it for a while at least.

When a plug develops a foul it has a build up of gas n oil n carbon etc on the insulator (porcelain/ceramic) which can partly conduct electricity so the plug never fires cuz that conductive current path bleeds off the coils stored energy n voltage BEFORE the voltage rises high enough as it normally does and arcs current across the open plug gap. In the normal situation the voltage across the plugs gap (since no conductive fouling material exists) ramps up until its high enough to cause a sudden current arc across the gap HOWEVER if the insulator is full of gas n oil n carbon etc as the voltage starts to ramp up the current slowly bleeds off the energy and it gets expended and the voltage never rises high enough to arc current. BUTTTTTTTT when you introduce that extra wide gap like pulling the plug wire off the plug that fouling short is out of the circuit (cant bleed off the energy) so the voltage rises high enough and then POWWWWWWWWW it can suddenly arc current across the gap n she fires yayyyyyyyyyyyyyy

NOWWWWWWW theres no free lunch (you cant create or destroy energy only change its form) and when you do things like create extra wider artificial gaps in coil n plug wires what youre doing is making the coil work harder and have to rise to higher voltage n produce n waste more heat then normal. True an otherwise fouled plug can then fire buttttttt at the expense of a hotter and harder worked coil and less energy expended across the plugs gap to better ignite the fuel cuz youre wasting stored coil energy in the form of heat (less efficient coil operation).

Try hotter plugs like Old said butttttttt if it keeps happening it could well be a broken ring or bad valve and/or low compression on that cylinder causing less efficient n complete combustion leaving more of the unspent fuel n residue on the plugs insulator n fouling it out

Ol John T and all in Indiana

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