crewy Posted August 31, 2017 Report Share Posted August 31, 2017 I have spark jumping out from the top of the coil to the top terminals when reving the motor. I think it's making the car kinda lack power when trying to go threw the gears. Is it a bad coil. I tried even changing the coil wire and it still jumps could this be do to upgrading to an internal altenator. Need some thought would love to drive this thing the right way Quote Link to comment
racerx Posted August 31, 2017 Report Share Posted August 31, 2017 Have u homed it out. 1 Quote Link to comment
racerx Posted August 31, 2017 Report Share Posted August 31, 2017 Meant ohmed it out? Sure way to tell. 1 Quote Link to comment
flatcat19 Posted August 31, 2017 Report Share Posted August 31, 2017 Is this a stock coil? Have you done a dizzy upgrade? Did you change wires with a new wire? Quote Link to comment
wayno Posted August 31, 2017 Report Share Posted August 31, 2017 The only time I ever had arcing was when the distributor cap was very dirty(outside), same could likely happen if the top of the coil is dirty, older stuff with points was the worst for me, even the dirty wires would arc if they were touching anything metal. I did have it happen with a matchbox also, but only once ever, but I will admit that it likely had not had a tune-up in 10 years, I am one of them guys that thinks if it ain't broke don't fix it, but that really doesn't apply to this situation. Quote Link to comment
datzenmike Posted August 31, 2017 Report Share Posted August 31, 2017 I have spark jumping out from the top of the coil to the top terminals when reving the motor. I think it's making the car kinda lack power when trying to go threw the gears. Is it a bad coil. I tried even changing the coil wire and it still jumps could this be do to upgrading to an internal altenator. Need some thought would love to drive this thing the right way Alternator will have nothing to do with the secondary voltage of the coil. COIL Inspect the tower for cracks or carbon tracking. Be sure the high tension wire is firmly seated down into the top of the coil Be sure the nipple is tight fitting around the wire and the coil tower. Replace as needed. DISTRIBUTOR Make sure the coil wire at the distributor cap is firmly plugged down into the cap. Make sure all plug wires are firmly plugged into the cap and onto the plug ends. Don't assume. If there are any small gaps, this makes it harder for the spark to jump the plug gap and it WILL look for an easier path to ground like the coil negative terminal. What you are trying to achieve hear is the plug gap being the easiest path for the spark to get to ground. 2 Quote Link to comment
crewy Posted September 2, 2017 Author Report Share Posted September 2, 2017 Stock coil and dist. All the other wires look good from what I can tell. While idling it runs fine no arc until I Rev it up. Could it maybe a Crack cap. Quote Link to comment
datzenmike Posted September 2, 2017 Report Share Posted September 2, 2017 If jumping at the coil, then the coil is the weak link. Inspect the top of the coil for cracks or carbon tracking. Doesn't really matter if stock or new it could be damaged. You'll actually have to take a good look. Is the rubber nipple clean and undamaged and is it snug fitting? Borrow another coil to distributor wire and see if this helps. Rub the inner side of the nipple with dielectric grease and try. My hesitation was intermittent spark jumping to the coil negative terminal. Easy to overlook tha tiny crack in the coil tower. Quote Link to comment
heywier427 Posted September 5, 2017 Report Share Posted September 5, 2017 You can also try sanding the arcing area to remove the carbon tracking. Works on the rubber bits as well. Just replace it all with autozone stuffs. If its not the problem, return it. No questions asked. Quote Link to comment
datzenmike Posted September 8, 2017 Report Share Posted September 8, 2017 I've done this also with good results. It won't fix a crack though. Dielectric grease will help but not a real fix. In the '70s my Charger was a bitch to start in the winter. Next summer I pulled the intake off that had the coil on it, took it off and the underside, not visible, was carbon tracked. Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.