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No need to remove the intake manifold to do this job unless you want to do other stuff also. It's not easy to see the sensor.
I removed a few things to get better access. I opened the coolant fill cap and screwed back on. I also unhooked battery ground when changing sensors. My preference, don't know if absolutely necessary. I also remove the 25 amp fuel injector fuse, but perhaps that's also not necessary.
1. Remove the hose from the IAC to the intake manifold.
2. Remove whatever other vacuum hoses are in the way (EGR in my case).
3. Label the fuel injector wires (I use different color twist ties) and pull these off the injectors. Unscrew the ground wires on the fuel rail (there are two), then put the screws back in to hold the fuel rail.
4. Pull off wire connectors to the knock sensor, temperature gauge sensor, cold start injector. Keep track of which is which.
5. Remove the distributor cap and rotor.
6. Now pull the fuel injector wiring harness down below the level of the ECT sensor. Push all the other wiring down. You should be seeing the sensor better at this point.
7. Remove the knock sensor.
8. I believe I used a 19 mm (3/4 inch) open end wrench--regular size and a stubby version to accomplish the ECT sensor change
9. The ECT sensor uses a copper gasket. I personally like to use new gaskets.
10. You will lose only a minimal amount of coolant.
11. Search on the internet for the knock sensor tightening torque.
Hope I have not left anything out. I also used a Bosch OEM sensor.
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