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chrispy 8/30/2010
2003 Nissan 350Z Touring 6Cyl3.5L - Engine
how do I find which coil is breaking up, miss firing
Engine at idle, you can hear breaking up, missfiring and fluctuating idle. Possible loss in performance.
1 Answer
  • Nissan Technical Advisor
    Individual ignition coils can be tested with an ohmmeter the same as those on a conventional distributor or DIS ignition system. Measure primary and secondary resistance and compared to specifications. If resistance is out of specifications, the coil is bad and needs to be replaced.Also, pay close attention to the tube that wraps around the spark plug. Cracks can allow voltage to jump to ground causing a misfire. The spark plug terminal should also fit tightly. If a COP coil tests bad and is replaced, future problems can often be avoided by cleaning the COP connector and wiring harness terminals. Corrosion at either place can cause intermittent operation and loss of continuity, which may contribute to component failure. Applying dielectric grease to these connections can help prevent corrosion and assure a good electrical connection.

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