BMW 3 Series E21 V6 engine injection system

Fuel injection system characteristics
The 323i engine uses the K-Jetronic mechanical fuel injection system from Bosch. The principle of operation of the fuel injection system The fuel pump takes...

Features of the device and operating principle
The fuel pump takes fuel from the fuel tank and delivers it through the filter and accumulator to the fuel distributor. The amount of air sucked into the...

Fuel dispenser and dispenser
Fuel dispenser: 1 — fuel dispenser; 2 - air flow meter; 3 — mixture regulator housing; 4 - gaskets; 5 - quality (mixture) adjustment screw plug; 6 — air supply...

Adjusting the throttle position
Remove the air intake housing and disconnect the throttle control rod from the lever. After loosening lock nut 1, unscrew screw 2 until stop 3 is released....

Adjusting engine idle speed
Warm up the engine. Using the mixture quantity adjusting screw 1, set the crankshaft speed within 900±50 rpm. Remove the plugs from the exhaust manifolds and...

Checking the air flow meter pressure disc
Make sure that in the initial position the upper edge of the air flow meter pressure disc is level with the base of the air flow meter body cone or no more...

Checking the fuel dispenser
Remove the diode relay and the fuel pump relay from the mounting block. Connect the contact "87" of the fuel pump relay holder with a wire to the "+" terminal...

Checking the performance of the fuel pump
Disconnect the fuel drain hose from the fuel dispenser. Attach a hose to the fuel drain fitting of the fuel dispenser and place a measuring cup under its free...

Checking the starting injector
Unscrew the starting nozzle and place a container underneath it. Turn the engine crankshaft with the starter and check whether the starting injector is...

Checking the thermal time relay
Disconnect the thermal time relay plug. Connect the test lamp with one wire to the "+" terminal of the battery, and the other to the "W" plug of the thermal...

Checking the control pressure regulator
Disconnect the connector from the control pressure regulator and connect the BMW 61 1 440 control wire to it. Connect an ohmmeter to the connecting contacts of...

Pressure check
Connect one hose of pressure gauge 13 3 060 with fittings 13 3 065 and 13 3 066 and with a two-way valve to the control pressure fitting of the fuel...

Checking the tightness of the system
Wait at least 30 minutes after stopping the engine. Attach the pressure gauge, as stated above , opening the two-way valve. Turn on the fuel pump directly and...

Checking the injection nozzles
Unscrew the injectors. Mount the injector on the injector testing and adjustment device and check the injection start pressure. Check the injector for leaks....

Possible malfunctions and methods of their elimination
Troubleshooting of the injection system and their elimination must be carried out with normal compression in all cylinders, with adjusted gaps in the valve...

Intake Manifold and Air Filter Parts
Intake Manifold Parts: 1 - intake manifold; 2,3 - gaskets; 4 - starting nozzle; 5 - connecting tube. Air filter parts: 1 - air filter assembly; 2 - filter...

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