LAvetteman

I have an MSD 6 setup with a MSD blaster coil. I have been noticing when I do spark leakage tests (spark in the dark) that there is spark leakage from both the positive and negative terminals of the coil, up the output (neck) of the coil. Maybe this is causing my low primary voltage that is giving me my 3000 rpm fits. Any suggestions?

71coupe

How low is your primary voltage? With that MSD, it should be around 450 volts (that may be hard to read on a multimeter unless it has the freeze setting)
I would check to make sure that the primary leads are on the right lugs. Coils will work when hooked up backwards, but not too good. (ask me how I know this) I think the primary pos wire on the MSD is orange - not sure.

As far as the spark leak, you have high resistance in the secondary circuit (high voltage side). The primary circuit doesn't have enough juice to climb up the coil like that. Maybe you are due for a new set of plug wires. It could also be a rotor or cap issue. Just remember, electricity is always looking for a ground (-), and will always take the path of least resistance, hopefully the gap at the spark plugs, but sometimes it will go after primary lugs (+-) on the coil - not good.
Good luck




[Modified by 71coupe, 12:16 AM 3/16/2003]

Larry B.

I agree... High resistance somewhere caused it. In any event you may now have a condition known as carbon tracking on the coil. The arcing actually imbeds carboon particals in the coil housing, usually under the rubber boot. This now provides a path for the spark to follow. Inspect the coil real close. Carbon tracks will get so bad they are often mistaken for cracks. They are almost inpossible to get rid of as they have become fused to the coil.. If you see these, just toss the coil and get a new one and be sure check the cap and rotor for the same condition as well as corrosion. Also do a "Ohm" chack on the plug wires.

Jvette73

Its also possible that the sparkplugs can be the cause of high resistance.

LAvetteman

Well, I guess I will try the coil next. So far the cap, rotor, plugs, and wires have been changed. No difference was made with the changes. I did try a new coil a while back, but not an MSD blaster. I know someone with a new one they are not using yet, I may try that. Thanks for all your advise guys. :)

Russ Bellinis

Make sure the outside of the coil is clean. Dirt and oil coating the outside of the coil make a fine conductor to create carbon tracks.