Originally Posted by Kustumb
What would be the absolute best way to see what parts are wearing out/damaged?
I got the most aggressive tune going on (hybrid) on 93 octane, so, I want to make sure everything is top notch.
Maybe others can chime in but generally if you check for any fluid leaks under the engine and around the head. Check your coolant to see if there's anything in it other than coolant.
Rough idle could denote compromised seals or gaskets but not usually or always so. Could mean an exhaust leak. Could also be clogged injectors or filter. Rough idle and rough acceleration can also be vacuum leak.
Any metallic clacking that's loud and audible changes in pitch and frequency but so can some exhaust leak.
Smoke from the tailpipe not during cold morning startups or keeps smoking even after warm ups. Colored smoke is bad.
Knocking (aka detonation) sounds like sand in a tin can is bad. Stop driving if you hear that.
Basically, if it sounds like and leaks like an old man with a crackling metal hip joint on diapers. That joint shouldn't make a sound. Means internally not lubed sufficiently or the socket is worn and is about to bust. That diaper should be dry (minus the condensation of the AC compressor aka body sweat).