hey i got a 91 civic si witha 93 teg ls motor...ive had it in for a good 1000 miles after being rebuilt with the only problem of the main radiator hose falling off lol but anyway a few days ago i was driving and i noticed the motor seemed to be getting louder...or soemthing...enuf to start rattling wut seems like most of my interior panels...at idle...its no problem...its not a knocking or anything...only between 2 & 3 grand rpm that its the worst...well after that the motor is loud anyway and my chipped ecu makes it louder at higher rpm...its kinda weird but when i push the clutch in it feels like the pedal is vibrating as well or something...i dunno...my first guess is an exhaust leak...at least thats wut im hoping it is....help me plzzz

 

Might be your mounts causing the vibe.

 

another option i was considering...theyre jus loose or need replaced?....but it only does it when its warm i guess

 

not the exhaust...ill tell you that much

check the mounts ^

 

well i checked em....the drivers side mount looks like the rubber things ( dont know proper term...lol) are slightly offset from the actual mount....the other mounts look fine

 

its the mounts, my engine does the same thing. what mounts you have?