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Discussion Starter · #1 ·
What’s up guys, I’ve done a ton of searching everywhere to try and figure this out but no definitive results, I know someone here will have some better info.
I just purchased an 06 Civic 5 speed 1.8 R18 with 125k miles.
-Issue: Intermittent chatter on clutch release that follows up thru the rpm band, meaning it’s rpm dependent. However, it’s a 50/50 issue. Sometimes it’s there sometimes it’s not.
** I drive between 2k- 3k rpm as this is my commuter car.
-Symptoms:
  • Whirring noise upon clutch pedal release in N.
  • Chatter in lower gears, rpm dependent. 50/50 time.
-Clutch pedal feels stiffer as it’s depressed further.
  • Medium level vibration between 50-65mph as well as vibration at idle and low frequency ruble noise over bumps. (Possibly unrelated due to visually bad lower rear motor/trans mount)
  • Engagements seems rough (like on/off switch if not VERY slow on release)
  • Squeal/whine on downshift as rpm increases to match lower gear (chatter comes more often than not at this point)
  • Consistent CREAK when depressing or releasing clutch pedal.
  • When applying heavy throttle, car initially bogs down for a second then continues normal accel.
  • When chatter does not present itself during normal operating rpms, continuing up past 3500rpm I get a different mechanical rattle not as loud or bad sounding.
Additional info: Car was 1 owner but handed down to college student before I purchased.
Clutch DOES hold strong and does NOT slip on heavy load.
Bad pressure plate, bearings?
Thanks in advance for the help everyone.
 

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A very common problem on this generation is the clutch hydraulic system(master, slave, and clutch line). I have a 2008 Si with 130k miles and had to replace the entire hydraulic system. In fact, it's so common that there are plenty of kits to do this. I went with the SirMoto kit and it's been great but for your non-si model, you might have to get an OEM replacement with a diaphragm.

The master has a diaphragm to help reduce clutch vibrations, when this goes bad, you can have weird engagement issues and this is a very common point of failure. All the aftermarket kits do away with this diaphragm.

This is actually an easy job to do, it's just a little awkward having to lay up under your dash.
 

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Discussion Starter · #3 ·
A very common problem on this generation is the clutch hydraulic system(master, slave, and clutch line). I have a 2008 Si with 130k miles and had to replace the entire hydraulic system. In fact, it's so common that there are plenty of kits to do this. I went with the SirMoto kit and it's been great but for your non-si model, you might have to get an OEM replacement with a diaphragm.

The master has a diaphragm to help reduce clutch vibrations, when this goes bad, you can have weird engagement issues and this is a very common point of failure. All the aftermarket kits do away with this diaphragm.

This is actually an easy job to do, it's just a little awkward having to lay up under your dash.
Thanks for the reply 👍🏼 Just this week I replaced the clutch pack and finally converted to SM flywheel in my race car to the tune of $3,100 so I’m really hoping the daily doesn’t need serious tranny work at the moment. I’m not a Honda pro by any means so I’m not sure if this is hydraulic related or mechanical. To my ears it seems mechanical. Did you have any of my same symptoms before fixing with this kit? Also I know we are talking about 2 different motors and trans and you’re saying that in both the Si and non-si the hydraulic systems are notoriously prone to failure?
 
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