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Has carbon tracks on the metal tabs inside cap and rotor has carbon on metal tab. can also burn top of cap were coil wire goes . some get hair line cracks .
On the cap the contact points inside will look coroded--not square edges and burnt spots where the rotor fires against,the rotor will look burnt on the tip and have rounded edges(in other words all metal parts in the cap and just the thicker metal on the rotor)the really shinny metal on the rotor will be black in spots where it connects to the cap in the middle but doesnt always go bad there
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A bad plug wire or plug can do that. There's 20-50 thousand volts going from the coil through the coil wire then the cap to the rotor then from the rotor through the cap and into the plug wire and finally the plug where it has to jump a gap, when these secondary ignition parts go bad the high voltage is going to go somewhere so it goes through the rotor and finally to ground through the plastic of the rotor. I hope this helps. Take care.
It sounds like u have a cam correlation problem... Take ur cap off mark where ur rotor is pointing on the dist. Mark the firewall where the dist plug is pointing take the 10mm bolt out n look @ the dist gear and see how bad it's worn!! When u take the cap off some times they're so bad when u move the rotor u can tell the excessive play hope this helps!!!!
If you've got spark from the coil but not at the spark plugs, it can only be 1 of 3 things.
Bad spark plugs or plugs not gapped properly.
Bad spark plug wires.
Bad distributor cap and rotor. This is pretty easy to check. Open up the cap and look at the points on the underside of the cap and also the point on the rotor. If they look corroded or worn, then you should replace them.
probably bad incorrect cap/rotor. maybe pickup coil but probably not. pop off the cap look at the brush/contact between rotor and cap, if messy lightly pull brush from cap and also cap use fine sandpaper to clean them, then push brush in till you hear a pop and reinstall rotor & try starting. or replace cap and rotor.
Take the cap off and watch the rotor turn. If the shaft broke and the rotor was not turning, you would not get any spark. Could be the engine ground also came off, so there would be no place for the spark to go. Plug wires could also be bad, but unlikely they all went at once.
Your distributor bushing is bad, causing the distributor to wobble when running. Get it checked out for repair and/or replace the distributor. Take off the cap and check the play in the shaft that the rotor is attached to first.
If you have spark at the coil then you have a good coil. You can't measure Ohm at a spark plug since it is alway open at the gap. But you can OHM measure a spark plug wire at both end. If you have nothing mean your wire is bad. You can swap one more wire to confirm a bad wire. If your wire is not bad then I recommend to replace both rotor and distributor cap. Good luck in locating the problem.
Bad plug wires, distributor cap, or rotor. Pull the cap if the contact points on the rotor or the cap look rusty they need to be replaced. If not try replacing the wires.
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