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When I turn my engine on and off, it clicks. When I press the gas pedalgoing up a hill, you can hear the engine clicking. I use 87 octane gas in the engine, which is what I'm supposed to use. What's wrong with it?
 

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Could be a hundred things. How many miles? You need to share your profile, year, model, engine type. How often do you change your oil. How long has it been? Did it just start or has it been doing it for a while?

Does it sound like lifters or detonation or a fan blade hitting the shroud? If you're not sure, you need to take a mechanic for a ride. A local mechanic who can listen to the noise and give his professional opinion. We're not able to do that on the Internet without a sound file. Sorry.
 
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