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Re: Ticking under the hood
You didn't say what year and engine, so it's hard to know what you "see" and hear-- injectors make noise that coincides with RPM, some engines also have a cold start injector that will only operate during warm up -- injectors have electrical and fuel inputs, so they should be easy to ID.
Generally, relays should not be "ticking" very rapidly -- sure it's not the turn signal/hazard flasher? They make noise on purpose, but they're usually in the interior, but they may also operate a relay under the hood.
Lastly -- some engines have a MAF [Mass AirFlow] sensor (in the intake tract) that heats a fine wire using battery current, resistance is measured across this wire to determine airflow -- there may be a relay here that is intentionally intermittent so that the wire does not burn, and so that resistance can be read on intervals(?).
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