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Author Topic: ignition problem  (Read 936 times)
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dhla40
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« on: 04 September, 2009, 05:49:25 PM »

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
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1976 1.3s coupe
1973 1.3s coupe
1982 montecarlo project
1976 alfa GT
1981 alfa spider
angelorange
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« Reply #1 on: 08 September, 2009, 11:04:14 AM »

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
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dhla40
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« Reply #2 on: 08 September, 2009, 05:36:02 PM »

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
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1976 1.3s coupe
1973 1.3s coupe
1982 montecarlo project
1976 alfa GT
1981 alfa spider
angelorange
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« Reply #3 on: 08 September, 2009, 09:26:42 PM »

Is cap a good fit?

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

Best.

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dhla40
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« Reply #4 on: 09 September, 2009, 10:29:11 AM »

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
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1976 1.3s coupe
1973 1.3s coupe
1982 montecarlo project
1976 alfa GT
1981 alfa spider
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