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-   -   85 300ZXT Backfires (https://www.askmehelpdesk.com/showthread.php?t=219338)

  • May 24, 2008, 12:12 PM
    DanPatrick10
    85 300ZXT Backfires
    Aside from needing a tune-up, my 300zx backfires after shifting at low speeds. It does not backfire while driving on the highway.
  • May 24, 2008, 12:45 PM
    TxGreaseMonkey
    Selected Possibilities:

    . Check for vacuum leaks at intake manifold or vacuum hoses.
    . Check idle rpm with a tach.
    . Check timing with a timing light.
    . Ensure spark plugs are in good shape.
    . Perform compression test on engine.
    . Check EGR system.
    . Check for damaged valve springs or sticking valves.
    . Check oxygen sensor.

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