If it's really injector noise, you might put small toroids around the injector control wires, or shield them. Your engine uses electrically-controlled injectors that are rather fancy. The injectors are controlled by the engine computer, which sends 110-volt pulses to the injector to turn it on. These pulses, of varying duration depending on how much fuel is to be injected, actuate solenoid valves that admit high-pressure oil (about 3000 psi, I think) to a large piston. That piston, in turn, actuates a small piston that in turn actuates a valve that admits fuel at very high pressure (over 20,000 psi) into the engine cylinder.
Anyway, the 110-volt pulse to the injector's oil valve could be pretty noisy. A toroid on the control wire might help, or maybe you could shield those wires.
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-- Carl
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