How do you adjust the dash pot if it's out of specification?

Loosen the adjusting screw lock nut, turn the adjusting screw, recheck the dash pot touch speed in the same manner, then tighten the adjusting screw lock nut.

How do you test the anti-dieseling solenoid valve?

If the engine does not stop when the lead wire is disconnected, the solenoid is stuck. Connect the solenoid valve lead wire to the battery and check for a "click" sound when the battery is connected and disconnected. If the test result is not good, replace the valve.

What should you do after replacing the anti-dieseling solenoid valve?

Always use a new washer, and after replacement start the engine and check that fuel is not leaking and that the anti-dieseling solenoid is in good condition.

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Nissan Micra Carburetor Dash Pot & Anti-Dieseling Solenoid Valve Adjustment

Carburetor dash pot and anti-dieseling solenoid valve inspection and adjustment procedure

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Service procedure for adjusting the dash pot and testing the anti-dieseling solenoid valve.

AI caption June 2005 · Photo 118 of 412

This is page EF & EC-18 from a factory service manual's Engine Fuel & Emission Control (Carburetor) section, covering two inspection and adjustment procedures. The Dash Pot section gives a four-step procedure: warm the engine to idle speed condition, turn the throttle valve by hand and read the engine speed when the dash pot just touches the stopper lever (specified touch speed 1,800–2,200 rpm), adjust by loosening the adjusting screw lock nut and turning the adjusting screw if out of specification, then retighten the lock nut. A diagram (SEF053D) identifies the dash pot, adjusting screw, and adjusting screw lock nut. The Anti-Dieseling Solenoid Valve section includes two illustrations showing the valve's location on the carburetor and a schematic with the ignition switch and battery. Test instructions state that if the engine does not stop when the lead wire is disconnected, the solenoid is stuck; connecting the lead wire to a battery should produce a "click" sound when connected and disconnected, and the valve should be replaced if the test fails. Notes call for always using a new washer and checking for fuel leaks after replacement. The anti-dieseling solenoid torque spec is 18–29 N·m (1.8–3.0 kg-m, 13–22 ft-lb).

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Frequently asked questions

What is the dash pot touch speed specification?: 1,800 - 2,200 rpm. Turn the throttle valve by hand and read the engine speed when the dash pot just touches the stopper lever.
How do you adjust the dash pot if it's out of specification?: Loosen the adjusting screw lock nut, turn the adjusting screw, recheck the dash pot touch speed in the same manner, then tighten the adjusting screw lock nut.
How do you test the anti-dieseling solenoid valve?: If the engine does not stop when the lead wire is disconnected, the solenoid is stuck. Connect the solenoid valve lead wire to the battery and check for a "click" sound when the battery is connected and disconnected. If the test result is not good, replace the valve.
What is the torque spec for the anti-dieseling solenoid?: 18 - 29 N·m (1.8 - 3.0 kg-m, 13 - 22 ft-lb).
What should you do after replacing the anti-dieseling solenoid valve?: Always use a new washer, and after replacement start the engine and check that fuel is not leaking and that the anti-dieseling solenoid is in good condition.