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Nissan Hardbody Idle Speed Too High

Q. I have a 1997 Nissan Hardbody with a 2.4 liter, manual transmission, A/C, and 89,000 miles. It idles at 1,500 rpm and does not go down after it is warm. I checked all the plugs and everything seems to be plugged correctly. Any help would be appreciated.

Thanks,
John

Nissan Hardbody Idle Speed Too High

A. The first thing you want to check for is vacuum leaks. Then make sure the throttle linkage is free and moving smoothly. Also check the fast idle cam. Make sure it is not frozen and adjusted properly. Here is the adjustment procedure.

  1. Remove air cleaner assembly.

    Nissan Hardbody Idle Speed Too High

  2. Make sure the FIC alignment mark is centered on the lever roller as shown in the figure.

    • An alignment mark is stamped on the FIC so that the top of the cam will face in the correct direction.

      Nissan Hardbody Idle Speed Too High

    • If necessary, adjust the FIC screw (A) until the alignment mark is centered on the lever roller.

  3. Start engine and warm up to operating temperature.

    Nissan Hardbody Idle Speed Too High

  4. Measure clearance (G) between the lever roller and the top of the FIC using a feeler gauge as shown in the figure. Clearance (G): M/T model: 2.0 - 2.6 mm (0.079 - 0.102 in) A/T model: 1.8 - 2.4 mm (0.071 - 0.094 in)

    Nissan Hardbody Idle Speed Too High

    • If clearance (G) is out of specification, adjust clearance (G) using adjusting screw (B) to 2.3 mm (0.091 in) (M/T) or 2.1 mm (0.083 in) (A/T).

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