I recently bought a 1gb 94 fwd for something to drive around while I work on my other one, and the price was good, but it had what seemed like a clutch master or slave cylinder issue. The slave was definitely leaking a bit, so swapped out a known good one from a 1ga which has been sitting for a year or so but clutch was working perfectly on it prior and even pedal felt perfect before pulling it.
The issue is a strange one. Sitting with the car off, clutch feels normal resistance. Pull out onto the road, by the 2-3 shift, the clutch pedal goes pretty much to the floor with little resistance and doesn't disengage all the way. Releasing it while still in the same gear, then pressing it again will usually disengage it, sometimes takes 3 pumps. This is repeatable. The car can sit for 3 days and clutch will feel perfect, drive it and by the 2nd shift it's to the floor. Idling previously felt similar to when the car was off, but tonight I noticed some pressure loss when idling.
After no luck swapped out the master as well. Then replaced the line with a 1 piece ss flex from master to slave. Using a russell speedbleeder, all air seems to be out of the system. Even tried an extended slave rod, felt really good for the first shift
Master adjuster is out all the way as far is it will go, pedal switch backed off to give maximum travel.
So, what can it be ? fork, throw out bearing, spring issues ? crankwalk ? I'd think if it were fork, tb or spring issues, it would be either consistently bad or randomly bad, but not only bad when vehicle is moving. I tried doing left hand and right hand donuts, but no change either way.
What's the next logical step ?