Hi, I'm about to do a compression test on my 5.0 and need to know which fuse to pull to stop the injectors from firing. I don't have the cover for my fuse box and don't know which is the ECU. I've already pulled the coil plugs. Thanks.
you could also hold the gas pedel to the floor, which also cuts the injectors when cranking; flipping the inertia switch would probably be easiest though.
or make sure it is in neutral with the ebrake on, and ignition KEY in your pocket. then jump the solenoid trigger wire to the battery lug (cranks but with the KEY OFF, it wont start).
or since you are doing compression, yank all the plugs out first (which is a good thing to do anyhow).