Tech Help — optispark problem

Why do Optispark distributors fail? Sandwiching any distributor between the engine block and the water pump just begs for trouble. Over the years we have discovered that several original equipment Optispark failures typically occur due to the inherent high heat and poor ventilation; distributor shaft support bearing failure being one of the most common issues. The lubrication for the distributor shaft support bearing dries up and then the ball bearings gradually turn to metallic dust. The intense heat from the failed or failing bearings eventually overheats the Optispark module resulting in poor performance or a no-start condition. Mitsubishi-grade Optispark modules...

How do you know the Optispark is failing? Let’s envision you are out in city traffic. As heat builds under the hood you first notice a minor misfire, then stalling occurs. You are most likely able to start the engine back up, but as time goes by the wait time increases before the engine will start. Eventually the engine will run when it is cool but as soon as heat builds it dies and refuses to start no matter what the engine temperature is. Before you rush to replace a component, be advised that the 1992-1993 ECM (Engine Control Module)...