RPMs don't drop when clutch disengaged

[kingoftheroses]

Is this normal and if yes, why does it happen?:

When I press the clutch pedal to coast to a light, the RPMs drop slowly in relation to the car's movement - the harder I stop, the faster the RPMs drop. It only settles at idle when the car is completely stopped. This doesn't make sense to me because the clutch plate and the flywheel are no longer connected when the pedal is pressed, right??

 

[BigRand]

Okay, so this is a really poor explanation, but I really just wanted to see if I was thinking on the right track.

1 reason the car's rpm's don't drop right away is because the ECU doesn't set right at idle, it will idle at about 1000-1300 before it comes back down

2. The motor in the car spins like your mixing koolaid in a jar, your hand(aka clutch) has got a lock on the handle, but when you let go of the handle (aka motor) it just spins for a little longer due to inertia and momentum.

What do you guys think>
and who's got the real explanation?

 

[Breaksteel]

hum, did you try this with your ac off?

 

[420a16g]

My Centerforce DF clutch does the same thing. I think BigRand is on the right track with his second explanation. especially at high rpms when you push the clutch in the rpms will not return to idle until completely stopped. Usually what happens to mine is that after reving at high rpms (going to redline frequently) the rpms will idle at about 1000-1300 until i completely stop then return to 800-900. but then again it never seemed to mess anything up so i didnt worry about it.

 

[selmerguy]

mine does the same thing and i just built it. don't worrie about it.

 

[siueclipse]

This is all BS.


The moment you press on the clutch the RPMs should fall to idle within a few seconds. The speed that you are going doesn't play any part in this activity. It sounds to me that you have a clutch that is going bad and is stay disengaged. This is not a good thing obviously.

My clutchmasters clutch was doing the same thing, I replaced it.

 

[dsmrunnah95]

Try going out and pressing the clutch in, then popping it in neutral. If the rpm's drop then, I'd bet that the clutch is going and isn't fully engaging.

 

[SnoopySLR]

The moment you press on the clutch the RPMs should fall to idle within a few seconds. The speed that you are going doesn't play any part in this activity. It sounds to me that you have a clutch that is going bad and is stay disengaged. This is not a good thing obviously.

My clutchmasters clutch was doing the same thing, I replaced it.

I agree with him. Mine does the same thing, and my clutch is about toast.

 

[Geno]

test master cylinder for leaks. pull back the "fore skin" WTF and if fluid is coming out replace the unit.

make sure your hydraulic clutch system has no air bubbles in it.

make sure (if you haven't upgraded to steel braded) your rubber line in your hydraulic clutch lines isn't bulging or expanding.

if this is a new clutch and pressure plate and nothing else works. check your pledal linkage for stress and ware. my act 2600 doesnt do what you guys are complaining about.

a act 2600 will ware out a clutch pedals linkage and will need to be re welded. see vfaq.com for further help.

 

[SnoopySLR]

test master cylinder for leaks. pull back the "fore skin" WTF and if fluid is coming out replace the unit.

make sure your hydraulic clutch system has no air bubbles in it.

make sure (if you haven't upgraded to steel braded) your rubber line in your hydraulic clutch lines isn't bulging or expanding.

if this is a new clutch and pressure plate and nothing else works. check your pledal linkage for stress and ware. my act 2600 doesnt do what you guys are complaining about.

a act 2600 will ware out a clutch pedals linkage and will need to be re welded. see vfaq.com for further help.

Very helpful... why didn't I think of that....

 

[Slammed0]

Hmmm, wierd. Half of you say your cars do it and the other don't. Mine does it. I have been told its normal. And I also just got my transmission rebuilt. Did it before the transmission rebuild as well.

 

[SonySlave]

I had a vacuum leak after I went onto the dyno because we didn't replug the vacuum nipple we used on the intake manifold and my RPMs would do something similar to this. As I would push the clutch in to stop, my RPMs wouldn't drop real quick like they normally would, they went down real slow, with the movement of the car EXACTLY like kingoftheroses mentioned in the first post. And as soon as I plugged it back up, VOILA! It stopped doing it... I'd check your vacuum lines under the hood... The intake manifold is a good starting point!