[risgate]

This is kinda a dovetail off of my horn relay post, but i am not sure if they are related or not.

I fried the horn relay. Once i fried it, the engine started to miss. I replaced it today, and still the same thing. It seems like it goes away once i get up to 40mph or so - which makes me think the higher rpm solves the issue.

I put a multimeter on the battery, 12.6. Cranked it over, never got above 13.4. I have a MSD 6BTM box in the car with billet dist.

Is this lower voltage enough to cause havoc with the msd box? If so, how can i trace where the issue is? I am figuring when i cooked the relay, i did some other type of damage - or its just one hell of a coincidence.

Electrical is not my strong suit, so any help anyone can give would be greatly appreciated.
Thanks

Ron

 

[bracketchev1221]

The MSD should run fine at 12 volts. Many race cars run without alternators and only on battery volts. Granted, an MSD will work better at 14.5 volts but it should not misfire at 12.

 

[teddisnoke]

I always go for a sparkplug wire check on a low speed misfire that clears up as you go faster....

Trace all your associated wiring out, frays, shorts, otherwise. It may be something very simple.