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I just changed my oxygen, speed, ref, and CHT sensors. Did this mainly because of age, while I am also chasing the cause of an occasional temporary no-start problem/stall problem when the motor is warm. DME relay is next.
As others have noted, the last three sensors are a bit awkward to replace and take some time. For the ref and speed sensors, it is easiest if you just remove the whole bracket with the old sensors in it, though this means you will have to gap the new sensors properly (see below).
The crucial step is to leave the cylinder/flywheel ends of the old sensor wires dangling by the flywheel so you can use those old wires to pull the new sensor wires through the engine bay and up to where the sensors plug into the connectors for the wires that feed the information to the DME. Another important step is to gap the sensors properly, which can be done easily by cleaning off your old sensors and gluing a 0.8 mm washer to the end; then slip that old sensor back in your bracket, position the bracket so that sensor, with washer, is up against the flywheel teeth; tighten down the bracket; remove the old sensor and insert you new sensors, and then pull the plug ends of those new sensors up through the engine bay.
Good luck and please don't hesitate to send any specific questions you may have as my memory is very fresh on this job.
Jonathan
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