How do you change the injectors?

Answer 1

It would be most helpful if you said what year car and which engine you are asking about. There is quite a bit of difference between changing injectors on a 2.5L 4 cylinder engine and a 2.8L V6, there is also differences between the earlier V6 (1985-

1986 and the later 1987-1990) If you have the 2.5L 4 cylinder engine write back and I will write more specific instructions for that.

If you have the 2.8L V6 this may be of use to you.

1. Disconnect the battery ground cable. Since you may spill some gasoline it would be prudent to have a proper fire extinguisher nearby. Wear protective gloves. In case you spill gasoline you want to do this in a well ventilated area. I prefer out doors.

2.Remove the air duct between the air filter and the throttle body.

3. Unplug any electrical connections on the plenum and throttle body and make note of where they go so you can put them back.

4. Disconnect cables and vacuum lines as necessary from the plenum, note where they go.

5.Remove the plenum and sit aside.

6. Bleed off the gasoline pressure from the fuel rail. Use a rag to keep the fuel from spraying, dispose of the rag properly.

7. Remove the vacuum line from the pressure regulator.

8. Unplug the electrical connections from the fuel injectors. Make note of where each goes for replacement purposes.

9. Remove the bolts that hold the fuel rail in place.

10. Remove the fuel rail by pulling it up. The fuel injectors have a clip that holds them to the fuel rail. The bottom of the injectors will be tight in the intake manifold, it may take some prying to get them out.

11. Slide the clips out to remove the injectors from the fuel rail. They will also be tight to get out, may need to be pried out. Note their orientation.

12. Clean out the ports where the fuel injectors enter both the intake manifold and the fuel rail. Do not soak the fuel rail in cleaner solution.

13. Lightly coat the new "O" rings in engine oil and slip them onto the ends of the new/replacement fuel injectors. They will slide back in much easier than they came out.

14. Push the new injectors into the fuel rail in the correct orientation and slide the retainer clips back in place.

15. Position the fuel rail over the intake manifold and make sure all of the injectors are entering their respective ports, then push down into the ports.

16. Put the bolts back in that hold the fuel rail in place.

17. Put new "O" rings on the fuel lines and reattach the fittings. Reattach the vacuum line to the pressure regulator.

18. Attach a temporary ground to the battery and turn the ignition on. The fuel pump should come on and build up pressure. Check for fuel leaks both in the fuel lines and the fuel injectors. Any leaks noted should be repaired at this point.

19. Remove the temporary ground, turn off the ignition.

20. Reattach the electric plugs to the fuel injectors.

21. Put the plenum back on with new gaskets and reattach cables, electrical fittings and vacuum hoses. Put the battery ground back in place last.

22. At this point everything should have been put back in place. Start the engine. There will be some air in the fuel rail and injectors so the engine may start hard and run rough until the air is replaced with gasoline. Check again for leaks, the smell of gasoline. Use an appropriate fuel pressure gage to measure the fuel pressure on the fuel rail. It should be about 45 psi. Use a rag to catch any fuel lost attaching the pressure gauge. Dispose of rag properly. Pressure will be a little lower at idle. If the pressure is too low or if the pressure drops when the ignition is shut off it can be an indication of a leak. Remove the fuel pressure gauge, again use a rag to catch leaks, dispose of rag properly.

I hope this will help.