The demands for better emissions and fuel economy in the mid 1970s necessitated leaner fuel mixtures. These leaner mixtures required greater voltage and more spark to ignite. This challenge led GM ...

Let’s start by looking at the evolution of the GM High Energy Ignition (HEI) system. This system became available as an option in 1974 and was standard in all 1975-and-later vehicles, with the ...

General Motors Co. more than doubled the size of a recall, to 1.6 million vehicles world-wide, after consumer complaints pushed the company to expand a replacement of faulty ignition switches to ...