Testing the ignition control module is a little trickier. When the module is exposed to a specific heat range—which can vary—it tends to fail. Therefore, the test may not be accurate.

The HEI distributor is an inductive-discharge-style ignition, but with the points replaced by a solid-state switching device called an electronic ignition-control module.

Instead, if possible, you’ll want to test the ignition module to verify it’s the issue. The process of testing your module is heavily reliant on the model you have to work with.

CD ignition use a separate coil and ignition box along with the distributor, and the system makes it easy to fire a really hot spark all the way through the rpm range.

Each distributor features Pertronix's exclusive Flame Thrower module and coil, which is said to operate without misfire through at least 7,500 rpm, as well as the company's centrifugal advance ...

[Dan] wanted to learn a bit about solid state ignition in engines; to get started he needed a test subject, so he decided he would upgrade his old 12 horsepower lawnmower. Originally the lawnmower … ...

In contrast to points, HEI ignition is considerably more maintenance-free. The task previously accomplished by fragile points is taken over by a reliable solid-state electronic module that can ...