Gene K

This is actually on a 5.0 but the clutch setup is supposedly identical on all 2005+ GT's so I posted it here for more visibility.

I have a new 2011 5.0 Mustang GT with the Manual 6-Speed. Im having a clutch issue. The clutch is sticking to the floor during high rpm shifts.

Experimenting to reproduce the symptoms resulted in the following:

1. Reving the engine out of gear with clutch in results in no issue.
2. Reving the engine in gear with clutch on floor results in stuck clutch.
3. Reving the engine in gear with clutch 1-2" off the floor results in pedal beginning to get light around 6000 rpm and being sucked to floor at 6500 rpm.
4. Putting trans in neutral while retaining 6500+ rpm with stuck clutch results in clutch pedal remaining stuck.
5. It takes significant effort to pull clutch pedal up to the point it "pops" up when its stuck if you maintain 6500+ rpm in neutral.
6. If you let off the throttle the clutch will pop up between 6500 rpm and 4000 rpm on its on. It seems "more stuck" sometimes than others.

Tried bleeding the old fashioned way (Drivers side front raised 10" with cap off and slow cycles of the clutch pedal for 20 minutes). Didnt seem to help.

It feels like its over-centering. Is this the pressure plate or is this just a symptom of another problem (hence not hanging in neutral).

Thoughts?

PS The tech at the dealer tried to claim this is a Ford Safety Feature (Yeah right!).

UPDATE:
https://mustangforums.com/forum/2005...ml#post7045374

Simon1

I wouldn't doubt that. I would have asked him to show me in writing where they say that. Even though it is mechanical, there maybe some way they figured to out hot to screw with the clutch feature.

Gene K

Ohhh.... Its pretty simple if its over-centering. The question is if its caused directly by the pressure plate or a symptom of something else being out of spec. That would be very easy to design in. After all they spent years and millions of dollars to get it out of diaphragm clutches,.

However the fact that none of the other 2011 5.0's have this feature is a hint in my opinion.

ShaneM

was it you that posted about this issue before, or are you the second guy here to have teh same prob? Your dealer tech soudns about as smart as the one at my dealer that wanted to flash teh ecm to stock on a blown car.

hammeron

i have to go with the pressure plate as the culprit
and a machining tolerance as the root cause. nothing
else seems to make any sense. i was thinking maybe
a rotating assembly imbalance, but am not sure exactly
how that would cause the pressure plate to malfunction.

Gene K

It was me. I was hoping it was something really simple (although knowing it wasnt likely).

Gene K

That it only occurs when trans is in gear (even when stationary) makes me wonder what the input shaft is doing. I also noticed it seems to be worse when placed in some gears than others.

hammeron

yeah i was wondering about the input shaft too....

during the vehicle stopped, in gear and engine reving scenario:
we would think the input shaft is absolutely still. the difference
between your pedal staying down or not at high rpms, seems to
only depend on how much rotational resistance the pressure plate
friction surface feels as it's returning to it's natural state.

svastano

I would park myself at the dealer until it was fixed. Otherwise It might get driven thru the showroom. Then the excuse would be the clutch was stuck!

Gene K

Contacted By Ford Powertrain Engineer. Parts on the Way.