Low energy to the plug? If it's not sparking properly, it will foul. Have you measured the resistance of the wires, you might have one marginal wire..
Sent from my iPad On Feb 10, 2011, at 6:41 PM, George Graves <[email protected]> wrote: > Thanks to everyone who responded. The miss is caused by a badly fouled plug (passenger side nearest the firewall). This is the second time that this particular plug has fouled (although the symptoms were slightly different last time, with the Lodge plugs, that it was happening again was my first thought and the first thing I looked at). The missing occurs when the fouling gets real hot. It's a funny ash color, there is no sign of oil on the plug and it doesn't seem to running too rich. But since these plugs are only a few months old, I can't imagine what's causing the fouling????!!!!! > > George Graves > '86 GTV-6 3.0 'S' > > > > > On Feb 10, 2011, at 4:58 PM, Ed wrote: > >> Hi George, >> I suggest that you connect a pressure gauge into the hose to the cold start >> injector with a T coupling. Then rev the engine hard and see if you start to >> lose pressure at higher rpm. Suspect the filter or pump if you lose pressure. >> Suspect the coil, plug wires or distributor cap/rotor if the pressure is >> steady and to spec. Quite a few folks report poor performance from Bosch >> platinum plugs. NGK copper core plugs are cheap and they work well. >> Ed Prytherch >> -- >> to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi >> or email "unsubscribe alfa" to [email protected] > -- > to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi > or email "unsubscribe alfa" to [email protected] -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
