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Home › GMC › 1982 › S15 Pickup 1.9L Eng VIN A, Automatic Trans › Repair and Diagnosis › Engine Performance › Ignition System › NIPPONDENSO Electronic Ignition System › Testing › Ignition System Check When Engine Runs Rough

Ignition System Check When Engine Runs Rough

  1. Remove spark plug wire from spark plug. Attach ignition spark tester to end of spark plug wire. Crank engine and watch for spark at tester.
  2. If there is no spark, refer to  "IGNITION SYSTEM NO-START CHECK. " If spark occurs, check ignition timing. If necessary, adjust to correct. If timing is to specifications, check to see if dwell angle increased. If so, problem is not with ignition system. Check fuel system and spark plugs.
  3. If dwell angle did not increase, check distributor pick-up coil air gap. See " PICK-UP COIL AIR GAP  " under "Adjustments".  Adjust if necessary. If air gap is normal, replace control module.
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