ignition problem

[dhla40]

Had a few ignition problems lately, the pertronix ignitor I fitted a few weeks ago started to fire erratically and could not be trusted so I fitted a spare points dizzy.  The car ran ok for fifty miles but I could feel a slight misfire at light throttle and on removing the cap found that all four contacts had a small v groove in them presumably from spark erosion?  I rechecked the rotor alignment at the static timing point and it looked close enough and the advance operated normally using strobe gun.  I am sure the contacts were ok when I fitted the points dizzy which came off another car but looks the same as my old one.  Has anyone had any cap contact burning issues before?

Sean

[angelorange]

Cap no4 terminal to modified inlet manifold - had arc there but am running MSD6AL multi spark box through original set up.

Apparently, Cap (plastic) groves caused by arc can be fixed with nail varnish!

For a tenner you can get a new cap

[dhla40]

I am talking about the internal contacts where the spark jumps from the rotor arm, have fitted an old cap and will monitor the situation.

Sean

[angelorange]

Is cap a good fit?

A slight groove in each is not a big issue as long as they all wear the same.

Best.

[dhla40]

It is a marelli cap but the contact erosion is all on the same side as if the rotor is too far away when the spark jumps but I have checked the alignment with the cap off and using a reference mark on the side of the dizzy and all seems to be in order.  Just another one of those mysteries of Italian electrics I guess?

Sean