Auto Electronics: 1990 chevy, spark plug wires, crankshaft sensor

Question
QUESTION: I have a 1990 chevy cavalier that has no spark. could you tell me the location of the ignition control module and how it comes off? Thanks.

ANSWER: Hello Bill, I'm not sure what you have already done to diagnose the no spark condition. The following link provides important information that might help you properly diagnose the problem. www.mightyautoparts.com/pdf/articles/tt76.pdf. Follow this link for instructions on module replacement. www.pfyc.com/supportfiles/GMDIS.pdf. Good luck. Don.

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QUESTION: I checked the spark plug wires, and when the engine cranks, there is no spark.There is no spark at the coil with the wire off. I just wanted to know how to get to the coil and module because I can't get to them to take them off.Is there any way you can send me a diagram of their location? Thanks

Answer
Bill, I do not have a diagram to send you. According to my information this vehicle should not have a distributor and have what is called a DIS ignition system. The DIS system consists of 2 or 3 separate ignition coils, an ignition module, a crankshaft sensor, a network of wiring and the electronic spark timing circuit. Depending on which engine you have will dictate the DIS ignition pack location. I believe the 4 cylinder pack is located toward the rear of the motor, while the 6 cylinder pack is in the front. If you have already found one of the coils, then the module is located underneath it. The second link I sent you in my first response has details on how to disassemble the pack and get to the module. Hope this helps. Don.