94 honda civic cx
d16a motor with t3/t4 turbo
this recently just happen, when i first turn on my motor the clutch is very soft and short. it will bite and take off almost instantly and will be like that until my car is warmed up and been driven around for a while and the clutch pedal slowly goes back to normal where its stiff and bites at a higher distance. what could be wrong?

 

bump

 

When cold does it idle at around 1500rpm? That seems to be the answer right there to me.

 

check ur clutch master cylinder. check ur clutch fluid, check ur slave cylinder. vacuum is accumulated when car is warm thus allowing ur clutch to accumulate more pressure/stiffness/rigidity.

 

i check my clutch master cylinder and there was no fluid. i filled it up. pump drove around, got stiff. but when car is cold again the softness comes back. so overall a vacuum leak might cause this?

 

Sounds like your master or slave is going out, what happens is that the seal inside the master or slave will shink up when it's cold and let a little fluid pass by. When it get warmed up, the seal expands back out, and it seals properly.

BTW, the hydrolics for the clutch release system are NOT vacuum boosted like the brakes, so engine speed has nothing to do with it. It's a VERY simple system.

 

yeah i thought the clutch master cylinder has no vacuum but when some guys start telling me my vacuum can be related i started to give it a second thought. but so you guys think it could be my clutch master?

 

if you don't have a ss clutch line, its worth looking into. I believe there is no expanding in the material compared to the standard silicone line, giving the clutch the same level of resistance, all of the time.

 

I had the same problem, it turned out to be my fluid

 

well my fluid was empty. i refilled it but the problem hasn't gone away yet. would bleeding it work?

 

im having the same problem. Did you figure it out?

i've bled my line repeatedly. my master cylinder shows no signs of leaks. shifts fine but gets annoying in traffic, since the pedal gets real stiff and engagements at the top of the clutch pedal travel.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by perseverance &raquo;</TD></TR><TR><TD CLASS="quote">check ur clutch master cylinder. check ur clutch fluid, check ur slave cylinder. vacuum is accumulated when car is warm thus allowing ur clutch to accumulate more pressure/stiffness/rigidity.</TD></TR></TABLE>

The clutch system has nothing to do with vacuum, noob

Sounds like the master's FUBAR to me. Seals warm up after a while and allow for easier movement, etc.

Truly, you only have a few parts in the system that can go bad and cause the kinds of symptoms you're describing:

1.) clutch pedal (extremely unlikely and wouldn't make any sense)

2.) clutch master cylinder

3.) clutch slave cylinder

4.) clutch fork (extremely unlikely as most everything else would kerplode first)

5.) clutch pressure plate (it happens, but not often with stock-ish applications)