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The distributor CAP is what is arcing. Non-AC Delco caps will do this. I chased my own "arcing" for months. Evidently there is a known problem with aftermarket caps arcing. I went through many caps until I learned of this. Swapped to AC Delco brand, solved all problems.
Sounds like you have concentrated on the HT items.
Time to go back and check out the LT circuit from the ignition switch through to the points in the distributor.
disconnect the feed going to the coil from the ignition switch. Switch on the ignition and 'flash' the lead to earth (ground)
You should get a healthy spark you would expect from the battery. If all is OK switch off the ignition and reconnect the lead. Remove the distributor cap. Worth checking the spring loaded carbon brush in the top of the distributor cap at this stage
Rotate the engine until the points are closed. Switch on the ignition and with a small insulated screwdriver open and close the points, a healthy spark should be seen every time you open the points. Check the condition of the points while here to make sure there has not been an excessive build up due to arcing, Clean or renew if necessary, Some distributors are fitted with a capacitor near the points - these can break down in time and always suspect.
If the spark across the points is good get a friend to turn the engine over while you watch the points. A good spark should be seen every time the cam opens the points. Clean the corrosion from the rotor and the segments on the distributor cap.
Sometimes the points are badly adjusted and prevent a good spark or the heel that runs on the cam gets badly worn.
The distributor cap may be faulty, it could be cracked or the spark is arcing to ground, or the rotor button is faulty. Also check the spark plug leads from the distributor to the spark plugs. If the distributor is faulty (ie cracked or there is a carbon track on the inside of the distributor cap) then replace the distributor. If the rotor button is faulty, then replace the rotor button.
sounds like the distributor cap could be cracked and is arcing out on the nearest metal object, probably the distributor body, if it is you will have to replace the distributor cap. Try and get the vehicle in a drker place as possible and run the engine with the bonnet/hood up and look for small bright blue sparks, if not from the distributor, check plug leads and plug caps
What year, make, model is your vehicle and what eng? I would suspect the spark distribution components (Distributor cap & rotor 1st, then plug wires & spark plugs) If it is an older vehicle - the vacuum advance in the distributor may be faulty. The distributor cap could be arcing (carbon arc) if old and or worn out. The ignition module (if newer) may be your problem - although - in most cases they usually just quit.
Several possibles: Plug wires arcing (run engine in a very dark area and open hood to see is there is arcing) Bad coil (same test look for arcing sometimes you can hear spark jumping) Distributor cap arcing inside or outside ( remove cap and inspect for carbon tracks inside cap). Module inside distributor bad (not too expensive to replace). Lean toward wires or coil.
on the caravan tranny here is list of external parts . stand in front of the van facing the driver kinda little of the center to the driver side... look down . between the rad and tranny there are two tranny cooler rubber hoses . one input sensor/two wire plug on your left and on your right is output sensor/two wire plug. directly look down and you ll see an eight wire rectangular plug/bolt in center plugged into the shift solenoid . again on your right is another smaller rectangular plug/no part which is your selector switch and safety switch which is internal and that my friend is the story.