The manufacturing process is a complex one and demands considerable technical expertise, but the result is an extremely durable distributor cap
with excellent insulation properties.
In your case, what's happening is that the moisture that's stuck inside the distributor cap
is compromising your spark.
I replaced the spark plugs, spark plug wires, distributor cap
and water/fuel separator.
Likely, it's something you've seen before: a loose plug, moisture under the distributor cap
, dirt in the carburetor.
When I'm working on my car I'll look at my distributor cap
and it will give me ideas for my next figure.
I discovered that the HT leads, the distributor cap
and the alternator were also malfunctioning.
A cracked distributor cap
lead meant they couldn't start the car up on the morning of the rally - but once that problem was solved they had a fairly straightforward day.
Make sure that the distributor cap
is moisture and dirt-free.
Putting rubber gloves on the distributor cap
to stop damp.