The current problem that has arised stated in the original post I will go into detail about again as I have done further more research today. Now before I go into some detail I will explain the problem again.
-car is running at idle not moving with no abnormal sounds/no difference with clutch engaged or disengaged.
-car is moving (in any gear, with trans in neutral clutch engaged or disengaged, at any speed ONLY with RELEASING foot from gas) the noise is still heard.
-noise is much quieter after taken out of gear (while moving with foot off gas only) it is also a lot louder in 1st and 2nd gear at high rpm engine breaking with gears and is heard most distinctive in 4th gear around 50-70MPH and noticeably quieter when trans is taken out of gear with clutch or trans but is still audible until the car is stopped.
-noise has been described by many people with all makes and models modified or unmodified cars with MT/AT AWD/RWD/FWD. Noise has been described as follows, playing cards against bicycle wheel spokes, grinding noise, rattle, trans gears non lubed with no whine, and tapping with almost perfectly exact consistency and frequency both effected by vehicle speed and rpm mainly speed both neutral or in gear MT/AT AWD/FWD. (Slower the speed slower the tapping or rattle, higher rpm faster and louder, higher speed louder faster ect) noise also described as almost always coming from trans/driveline from front of car alternating from left or right side.
-I have noticed a slight vibration from the stick alternating with speed and volume of the noise described following the stipulations above especially pulling it out of 4th gear into neutral from 50-70 the vibration is noticeably less. The vibration has only been described by 30% of people INCLUDING myself. Vibration is almost completely gone and back to normal when car is stopped.
-CONDITIONS 1 no change in sound when car cold or normal 2 has been cold here 3 no change from road bumpy smooth ect
with all detailed above I will share some things ive found on the internet regarding what people have commented on what this noise could be.
-Exhaust rubbing or rattling
-Resonator separation (Noted TSB on 99-00 Civic Si for stock exhaust, but noise seems to always come from front of car)
-Subframe bolts lose (bolts rattle after load is taken off driveline by releasing gas pedal)
-lose rattling heat shield (I would think it would be too irregular of a noise, more distict, happen under acceleration as well not just decel)
-Clutch Disk Springs rattling (many people with same clutch installed as me "Exedy OE Replacement"+"Lightweight Flywheel" have described this happening shortly after install, didn't start happening to me for 3-5kmiles as well as I would think it wouldn't be as consistent of a sound and more irregular
-exhaust (cat breaking apart) lose bolt or separation from header/manifold at cat
-lightweight flywheel + clutch pressure plate combination is unbalanced together or install of lightweight flywheel altogether (claimed to be unfixable issues/normal without factory parts) but as I described the sound is still heard with the clutch is engaged or disengaged, sound only gets quieter by trans being put in neutral. Almost makes me rule out clutch or flywheel
-timing belt or timing belt tensioner or pulley bearing
-EGR Cooler flex lines (releasing gas petal causes backpressure or a stuck throttle plate or intake exhaust flutter inside intake manifold)
-loose bolts somewhere on suspension
I cant rule out some of these without further Inspection of the car. With the warmer weather on its way it will be put on a lift and looked over entirely I will also attempt to move the car down a hill without the engine running to duplicate the sound. With more inspection I will check back and rule out some noted things as well as note findings or fix.
Please any feedback or thoughts/questions are greatly appreciated I also promise to help pass this on to whomever is having similar problems as it seems to be effecting a lot of people without many really having answers
some people also have done transmission replacements and still have had the same problem with even a brand new transmission. Thanks again
Tuesday, March 17th, 2015 AT 8:00 PM