JZTRK

im having to replace the cap and rotor about every three months due to Excesive Carbon Build up on the contacts ive try'ed the MSD,ACCEL,Borg warner all with the brass contacts.
What would be causing that
About the car... 1990 5.0 full HCI W/Tune. stock ignition,distributor and a msd coil FRPP 8mm wires. Any insight would help

sn95_331_GT_ yellow

any water in the inside?

JZTRK

The inside is dry no moisture or condensation. i have a life time replacement on the cap and rotor so it dosent cost a penny to swapp out its a BWD nascar sieres

4rdnut

Get a new distributor, sounds like oil vapor is getting past the bushings inside the distributor, contaminating the contacts and cap. The electrical sparks inside the cap ionizes the oil vapor, turning it a powdery crusty brown or black.

droptop302

I use to go through that even with a new dizzy what worked for me was popping the breather cap off. It worked dont know why..

.boB

This has come up before. Some people really have a tough time solving it, and most people never get it at all. It seems it's a problem with either oil mist or misture. If there is a vent, remove it, so it's bigger. If there is no vent, try drilling a 3/16" hole in the back of the cap.

JZTRK

I just picked up a new MSD Billet DIST. and I will install it this week end ill se how it turns out.