Multipoint injection system
1. Start the engine and warm it up to operating temperature.
2. When the engine is idling, remove the connectors from the injectors one by one - they are in order. If the engine speed does not change when the injectors are turned off, do the work described below.
3. Using a high resistance voltmeter with the engine running, check the voltage at the injector connector.
- A) if the voltage changes from zero to two volts, the injector receives enough electricity. Check the resistance of the injector solenoid winding (see step 4).
- b) if there is no voltage, check the additional resistance of the injector (see Section 15).
- V) if the additional resistance is normal, check the wires between the resistance and the injector and between the injector and the electronic module for short circuits, breaks or poor contact.
- G) if there is voltage, but the engine does not respond to the injectors turning off, listen for the clicking sound of the injector valve opening. If the sound is the same as running injectors, check the resistance of the solenoid coil.
4. With the engine stopped, measure the resistance of the injector solenoid windings. If the resistance is out of specification, replace the injector.
Replacement
5. Disconnect the negative cable from the battery.
6. Relieve fuel pressure (see section 2).
7. Remove the air filter (see Section 7).
8. Disconnect the injector connectors.
9. Disconnect the vacuum and fuel return hoses from the pressure regulator.
10. Disconnect the two ground wires from the exhaust manifold.
11. Disconnect the fuel hose from the distributing pipeline (nozzle holder).
Pic. 15.11 Assembling the nozzle holder
12. Turn away nuts of fastening and remove the holder and nozzles.
13. Remove the nozzles from the holder. Note the position of the damping and sealing rings.
Pic. 15.13 Assembling the multipoint injection system
Note: every time you remove the injectors, replace the sealing and damping rings.
14. Lubricate a new damping ring with engine oil and put it on the nozzle.
15. Lubricate the rubber ring with engine oil and put it on the nozzle. Install the nozzle on the holder.
16. Lubricate the seals with engine oil and insert it into the nozzle hole in the intake manifold.
17. Install the injectors into the manifold. Make sure the marks on the injectors and manifold match. Tighten the fastening nuts to the torque specified in the specification.
Pic. 15.17 Location of marks on the intake manifold and injector
18. Assembly order is reverse to disassembly.
19. After completing the installation of the injectors, turn the ignition key until the fuel pump is turned on, but do not turn off the starter. Turn off the pump. Repeat this two or three times and check for fuel leaks.
Dual point injection system
Control
20. Disconnect the electrical connectors from the top (main) bottom (auxiliary) nozzles.
21. Measure the resistance of the coils of the injector solenoids and compare them with the specification data. If the resistance does not match, replace the injectors.
22. A deeper control of the condition of the fuel system should be carried out at the service station.
Replacement
23. Disconnect the negative cable from the battery
24. Remove the air filter housing from the throttle body,
25. Disconnect electric sockets from atomizers.
26. Turn away screws of the holder and extend atomizers from sockets.
Pic. 15.26 Installing the nozzles (two-point injection scheme)
27. Lubricate the seals with engine oil, put them on the nozzle and mount the nozzles in the damper housings.