Mazda MX-5 NA silhouetteMX-5 NA

DECELERATION CONTROL SYSTEM

F-121prose procedure

DESCRIPTION

The deceleration control system consists of the fuel cut operation and the dashpot.
1. Dashpot: To prevent the throttle valves from suddenly closing.
2. Fuel cut: To improve the fuel economy and to prevent engine bucking during deceleration.

DASHPOT

Inspection

Dashpot Inspection

  1. 1
    Open the throttle valve fully. Push the dashpot rod with a finger and verify that it goes into the dashpot slowly.
    Close-up illustration of the dashpot mounted near the throttle body, with a double-headed arrow showing the rod movement to be tested by finger.
    05U0FX-190
  2. 2
    Release the rod and check that it comes out quickly.
  3. 3
    Replace the dashpot if necessary.
  4. 4
    Warm up the engine and run it at idle.
    Close-up illustration of the dashpot and throttle linkage with the lever-to-dashpot-rod contact point highlighted for the engine-speed adjustment procedure.
    05U0FX-191
  5. 5
    Connect a tachometer to the engine, and increase the engine speed to 4,000 rpm.
  6. 6
    Slowly decrease the engine speed and check that the lever touches the dashpot rod as specified.
    Specification: 2,500 ± 150 rpm
  7. 7
    If not as specified, loosen the locknut and turn the dashpot to adjust.
Dashpot set engine speedSlow decrease from 4,000 rpm — lever touches dashpot rod
2,500 ± 150rpm
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