Clutch Disengaging at high RPM?

Ben370 · 01-26-2017, 02:14 AM

On my way home today, all of a sudden my car starting losing power around 4000 rpm. Almost like it’s in neutral but not quite since the shifter is in gear and the pedal comes all the way back up.
If I stay below that, it’s fine.
I checked the clutch fluid and it’s full and in good condition. Also checked the other fluids while I was at it and those are fine.

Can someone help me figure this out? Dragging clutch maybe? Could it be the linkage? The clutch worked just fine until today.

BGTV8 · 01-26-2017, 03:05 AM

Clutch slip ....... how many miles has the car done

Ben370 · 01-26-2017, 03:17 AM

86k miles. Does clutch slip normally happen so abruptly? I'd figure it'd be a gradual thing. This is my first manual btw...

It shifts fine but once I rev up to 4k it bucks and doesn't have throttle response...but back to normal once the revs drop.

Cyber370 · 01-26-2017, 04:55 AM

Yep. Time for a new clutch.

Ghostvette · 01-26-2017, 09:11 AM

Quote:

Originally Posted by Ben370

On my way home today, all of a sudden my car starting losing power around 4000 rpm. Almost like it’s in neutral but not quite since the shifter is in gear and the pedal comes all the way back up.
If I stay below that, it’s fine.
I checked the clutch fluid and it’s full and in good condition. Also checked the other fluids while I was at it and those are fine.

Can someone help me figure this out? Dragging clutch maybe? Could it be the linkage? The clutch worked just fine until today.

Quote:

Originally Posted by Cyber370

Yep. Time for a new clutch.

Great time to upgrade to either the HDCSC or Z1's elimination kit. GL

Jayhovah · 01-26-2017, 09:15 AM

Quote:

Originally Posted by Ghostvette

Great time to upgrade to either the HDCSC or Z1's elimination kit. GL

Yup, no-brainer. The most expensive part of this process is the labor.

Might as well upgrade the clutch too, if only because I'd imagine a Z1 street clutch is probably far cheaper than OEM.

Ghostvette · 01-26-2017, 09:29 AM

Quote:

Originally Posted by Jayhovah

Yup, no-brainer. The most expensive part of this process is the labor.

Might as well upgrade the clutch too, if only because I'd imagine a Z1 street clutch is probably far cheaper than OEM.

Hopefully, OP can find a shop that lets him provide the parts.

Ben370 · 01-27-2017, 01:43 PM

Yeah I ordered the Z1 clutch kit, Zspeed HD CSC, and OEM Master Cylinder. For fluids I got Motul RBF600 and Redline MT85.

Ben370 · 02-09-2017, 12:01 PM

I did the pressure plate but not the bushing or flywheel because they looked fine. I did it myself. It drove well at first but the next day on a cold start, the issue reappeared. I drove it today and it's fine again. Seems to only happen on cold start.

Wilson2608 · 02-09-2017, 02:52 PM

I think the fuel pump stays at a constant pressure like someone posted before. If not it should only have two settings (high/low). I don't think it's a fuel pump related problem though. If your car is not making a connection to the driveshaft it has to be the clutch or some other component related to driveshaft function. Flywheels have surface areas that can get worn as well.

ragtopz · 02-10-2017, 01:21 PM

No power above 4k RPM and bucking does not sound like clutch slip. With clutch slip your car will rev but not accelerate, worse effect in higher gears.

Any misfire or other codes? May be cam/crank position sensors, but codes would help narrow the issue down.

Ben370 · 02-10-2017, 01:38 PM

Quote:

Originally Posted by ragtopz

No power above 4k RPM and bucking does not sound like clutch slip. With clutch slip your car will rev but not accelerate, worse effect in higher gears.

Any misfire or other codes? May be cam/crank position sensors, but codes would help narrow the issue down.

No codes. Could it be the flywheel since I didn't change that?

Wilson2608 · 02-10-2017, 09:34 PM

Is the car still revving and not accelerating or is it just bucking down around 4K?. I thought you said the clutch was slipping

Ben370 · 02-11-2017, 08:35 PM

Quote:

Originally Posted by Wilson2608

Is the car still revving and not accelerating or is it just bucking down around 4K?. I thought you said the clutch was slipping

revving and not accelerating. but there's a a sudden jolt when it happens. Also now that I installed the new clutch, I think it's sometimes still making contact with the flywheel when the clutch pedal is all way down because it's harder to shift. Could just need some bleeding for that issue though...

rovert · 02-12-2017, 04:35 PM

Hi, just noticed you mentioned you fitted the clutch yourself.
No idea of your mechanical skill level so please don't take this as any sort of a dig.
Could you have possibly fitted the clutch disc the wrong way around.
This could possibly explain some of your issues, if it is backwards, the hub of the clutch disc could be riding slightly on the flywheel, which would cause bad engagement & slipping under load.

01-26-2017, 02:14 AM	#1 (permalink)
Ben370 Base Member Join Date: Mar 2016 Location: Virginia Posts: 72 Drives: [SOLD] 09 Tour/Sport Rep Power: 3365	Clutch Disengaging at high RPM? On my way home today, all of a sudden my car starting losing power around 4000 rpm. Almost like it’s in neutral but not quite since the shifter is in gear and the pedal comes all the way back up. If I stay below that, it’s fine. I checked the clutch fluid and it’s full and in good condition. Also checked the other fluids while I was at it and those are fine. Can someone help me figure this out? Dragging clutch maybe? Could it be the linkage? The clutch worked just fine until today. Last edited by Ben370; 01-26-2017 at 02:48 AM.

01-26-2017, 03:17 AM	#3 (permalink)
Ben370 Base Member Join Date: Mar 2016 Location: Virginia Posts: 72 Drives: [SOLD] 09 Tour/Sport Rep Power: 3365	86k miles. Does clutch slip normally happen so abruptly? I'd figure it'd be a gradual thing. This is my first manual btw... It shifts fine but once I rev up to 4k it bucks and doesn't have throttle response...but back to normal once the revs drop. Last edited by Ben370; 01-26-2017 at 03:27 AM.

01-26-2017, 04:55 AM	#4 (permalink)
Cyber370 Track Member Join Date: Jul 2016 Location: Montreal, QC Canada Posts: 679 Drives: 2016 370Z Nismo 6MT Rep Power: 19372	Yep. Time for a new clutch. Ghostvette and NISMO IX like this. __________________ "That’s when you know you’ve found somebody special. When you can just shut the fck up for a minute and comfortably enjoy the silence.”-Mia (Pulp Fiction)*

02-09-2017, 12:01 PM	#9 (permalink)
Ben370 Base Member Join Date: Mar 2016 Location: Virginia Posts: 72 Drives: [SOLD] 09 Tour/Sport Rep Power: 3365	I did the pressure plate but not the bushing or flywheel because they looked fine. I did it myself. It drove well at first but the next day on a cold start, the issue reappeared. I drove it today and it's fine again. Seems to only happen on cold start. Last edited by Ben370; 02-09-2017 at 02:39 PM.

02-09-2017, 02:52 PM	#10 (permalink)
Wilson2608 Enthusiast Member Join Date: Dec 2014 Location: Nashville Posts: 301 Drives: Nissan 370Z Sport Rep Power: 11	I think the fuel pump stays at a constant pressure like someone posted before. If not it should only have two settings (high/low). I don't think it's a fuel pump related problem though. If your car is not making a connection to the driveshaft it has to be the clutch or some other component related to driveshaft function. Flywheels have surface areas that can get worn as well. __________________ Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

01-26-2017, 03:05 AM	#2 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,515 Drives: 09 Nissan 370Z M6 Rep Power: 39974	Clutch slip ....... how many miles has the car done

01-27-2017, 01:43 PM	#8 (permalink)
Ben370 Base Member Join Date: Mar 2016 Location: Virginia Posts: 72 Drives: [SOLD] 09 Tour/Sport Rep Power: 3365	Yeah I ordered the Z1 clutch kit, Zspeed HD CSC, and OEM Master Cylinder. For fluids I got Motul RBF600 and Redline MT85.

02-10-2017, 01:21 PM	#11 (permalink)
ragtopz Base Member Join Date: Dec 2016 Location: Colorado Posts: 1 Drives: 11 370Z BK-A7 Rep Power: 9	No power above 4k RPM and bucking does not sound like clutch slip. With clutch slip your car will rev but not accelerate, worse effect in higher gears. Any misfire or other codes? May be cam/crank position sensors, but codes would help narrow the issue down. Rusty likes this.

02-10-2017, 09:34 PM	#13 (permalink)
Wilson2608 Enthusiast Member Join Date: Dec 2014 Location: Nashville Posts: 301 Drives: Nissan 370Z Sport Rep Power: 11	Is the car still revving and not accelerating or is it just bucking down around 4K?. I thought you said the clutch was slipping __________________ Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

02-12-2017, 04:35 PM	#15 (permalink)
rovert Base Member Join Date: Nov 2015 Location: Australia Posts: 64 Drives: 08 Skyline 370GT Rep Power: 10	Hi, just noticed you mentioned you fitted the clutch yourself. No idea of your mechanical skill level so please don't take this as any sort of a dig. Could you have possibly fitted the clutch disc the wrong way around. This could possibly explain some of your issues, if it is backwards, the hub of the clutch disc could be riding slightly on the flywheel, which would cause bad engagement & slipping under load. __________________ 08 Skyline 370GT SP Coupe 5AT: Diy TT

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