Adjusting the high pressure fuel pump (Peugeot 406)

Control lever adjustments

Attention! The described adjustment applies only to the Bosch fuel pump. The Lucas fuel pump does not require adjustment, as it is controlled by the ECU electronic system.

Since the usual type of tachometer, which operates from the ignition system pulses, cannot be used on diesel engines, a diagnostic connector is installed on them for connecting special measuring equipment that is not available at home. If the idle speed differs from the required one, it is necessary to use a special tachometer or contact a Peugeot station.

Adjusting the accelerator cable

1. Before making adjustments, warm up the engine to normal operating temperature so that the radiator fan comes on at least twice.

2. Check the accelerator cable adjustment as follows.



3. The lever on the fuel pump must come into contact with the maximum speed adjustment screw (indicated by the arrow), otherwise remove the accelerator cable adjusting clamp and install it in the required groove to ensure normal accelerator cable tension.



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4. Remove the accelerator cable and check that the control lever is in contact with the fuel metering screw.

Adjusting the idle speed

1. Loosen the lock nut and back off the fuel metering screw until it clears the control lever.

2. Loosen the lock nut and turn the idle speed adjustment screw until the desired engine speed is set. Tighten the lock nut.

Adjusting the fuel dosage

1. Insert a 1mm thick spacer or feeler gauge blade between the pump control lever and the fuel metering adjustment screw.

2. Start the engine in idle mode. The engine speed should correspond to the required values.

3. If necessary, loosen the lock nut and set the required engine speed with the fuel metering screw. Retighten the lock nut.

4. Remove the gasket or dipstick blade and check the idle speed.

Fast Idle Speed Adjustment

1. Turn off the engine and check that the lever is in contact with the adjusting screw. If necessary, loosen the lock nut and move the nut (B) of the idle speed increase control cable. Tighten the lock nut (A).

2. Remove the vacuum hose from the idle speed increase control diaphragm and start the engine. Check that the engine runs at a high idle. If necessary, loosen the lock nut and move the idle speed increase control cable nut. Tighten the lock nut. Turn off the engine and reconnect the vacuum hose to the diaphragm.



3. Finally, turn off the tachometer.

4. If the idle speed increase adjustments are made, adjust the shock absorber.

Shock absorber adjustment

Bosch High Pressure Fuel Pump Adjustment Elements

1. Make all adjustments described above.

2. Loosen the lock nut and remove the control arm damper adjustment screw located at the rear of the arm and insert a 1.0 mm thick spacer or feeler gauge blade between the damper rod and the adjusting screw (see figure Bosch high pressure fuel pump adjustment elements).

3. Turn the adjusting screw until the gap is set so that the blade of the feeler gauge can easily move between the shock absorber rod and the screw. Tighten the lock nut.