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Home >> Nissan-Datsun >> 1990 >> 300ZX Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/O Codes >> Hard Start/Will Not Start >> Cold
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Hard Start/Will Not Start: Cold

  1. Ensure battery is fully charged and maintains at least 9.6 volts during cranking.
  2. Ensure fuel pressure is within specification.
  3. Check idle speed control circuit. See IDLE CONTROL SYSTEM in SYSTEM/COMP TESTS article.
  4. Perform appropriate test in INJECTOR MALFUNCTION diagnostic chart in I) SYSTEM/COMP TESTS article. Use DIAGNOSTIC CHARTS DIRECTORY table in I) SYSTEM/COMP TESTS article to locate chart.
  5. Check for spark using spark tester.
  6. Check spark plug for improper gap or fouling.
  7. Check ECU harness connector.
  8. Check ECU power source and ground circuit. See ECU POWER SOURCE & GROUND diagnostic chart in SYSTEM/COMP TESTS article. Use DIAGNOSTIC CHARTS DIRECTORY table in SYSTEM/COMP TESTS article to locate chart.
  9. Try a known good ECU.
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