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The design engineering team was very precise about the size of this hole.Īfter the design was completed the unit was passed on to what is called validation engineering. This would allow any condensation formed within the distributor to drain out. The casing of the Opti-Spark, which was mounted to the front of the engine, just behind the water pump, was designed with a small hole at the base. The Problemįor all of its innovations, one major problem occurred in the transition to actual production. This reduced cap and rotor wear by reducing the ozone formed when the spark is jumping large rotor-to-cap gaps. Spark errors also occur during transient movements such as acceleration, deceleration and transmission shifts.Ī key element in this Opti-Spark system was the increased overall diameter of the distributor which allowed for greater separation between the secondary terminals within the cap.
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Contrary to what many people believe, most spark errors actually occur at low speeds, especially starting, not at high rpm.
#How to install spark plug wires in a 93 firebird lt1 driver#
The Opti-Spark is a distributor with a two track optical position sensor, a keyed drive shaft, an ECM, a single ignition coil and driver and conventional secondary wires and park plugs. This was a traditional problem with magnetic reluctance timing sensors. GM also wanted to eliminate the large timing errors that happen during starting. One of the goals was to control spark scatter during transient maneuvers, such as acceleration. Instead there was an internal mistake and the Opti-Spark caused Corvette owners a tremendous amount of aggravation. This new Opti-Spark distributor was supposed to be the greatest thing since GM did away with ignition points. I would install the new Opti-Spark and when you’re sure the engine runs properly get started on the spark plugs and the spark plug wires. Spark plug wires on the LT1 are a major effort. Tip: Don’t ever let any water get in the area of the Opti-Spark if you detail your engine compartment.Ĭomplementary Work: This would be a good time to install new spark plug wires. Tools: A Visa card with a large credit line.