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Ignition control module, pickup, coil, keyswitch, loose connections. With ignition key on (engine not running) check for 12v (battery voltage) present at Ignition Control Module (pink/black wire)

91 cavaliers use two separate coil packs so check if no spark on all 4 cylinders.

Check for a bad Crankshaft Position Sensor (CPS) Should read 800-1200 ohms between the two leads. If it's open or reads very high resistance - replace. It should be putting out a .8 to 1.4 volt ac signal during cranking. If the Ignition Control Module does not see this signal - no spark.

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โˆ™ 2009-02-16 20:34:50
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Q: What can one look for if there is no spark on a 1991 Chevy cavalier?
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