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Old 03-16-2017, 10:19 PM   #322
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Join Date: Feb 2008
Location: Kansas, USA

Originally Posted by Duder View Post
but think about installing a wasted spark system on a Volvo redblock engine. We are using wasted spark.....
GM used wasted spark for years...I still own two vehicles with wasted spark.

Repair Guide - GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

The Direct Ignition System (DIS) or Electronic Ignition (EI) is used on the 1987-92 2.0L (VIN 1 and H), 2.2L (VIN G and 4), and all 1987 and later 2.8L (VIN W) and 3.1L (VIN T) engines.

The DIS or EI system does not use the conventional distributor and ignition coil. The system consists of two (4-cylinder) or 3 (6-cylinder) separate ignition coils, an ignition module, DIS ignition module or Ignition Control Module (ICM) as applicable, crankshaft sensor or combination sensor, along with the related connecting wires and Electronic Spark Timing (EST) or Ignition Control (IC) portion of the computer control module (ECM/PCM).

The distributorless system uses a "waste spark" method of spark distribution. Companion cylinders are paired and the spark occurs simultaneously in the cylinder with the piston coming up on the compression stroke and in the companion cylinder with the piston coming up on the exhaust stroke.
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