Please help. Intermittent vibration '94 6-spd
Thread Starter
Intermediate
Joined: Jul 2017
Posts: 27
Likes: 0
From: Los Gatos CA
Please help. Intermittent vibration '94 6-spd
(I had a thread that was hijacked. Forgive me for reposting.)
This is a new problem, as I've had the car for 2 years and it just has begun:
Annoying intermittent vibration felt in shifter when in gear. Cycles on and off, 5 seconds vibration, 5 seconds gone.
Definitely in the driveline. Feels like a bad bearing.
At all speeds.
Vanishes when I put in clutch.
The vibration is most strongly felt in the shifter.
But it of course I feel it throughout the car.
It disappears when rolling in neutral.
Does not seem to be the clutch.
It recedes almost completely, but not quite, when the clutch is depressed.
This is a new problem, as I've had the car for 2 years.
Replaced U-joints and rear bearings. 6 month old tires all around.
Maddening. Please help me diagnose.
Thank you so much.
~Ricardo Furioso
ps-I'm sorry I've had to repost this, but I still can't figure out what it is. Thanks again for suggestions.
This is a new problem, as I've had the car for 2 years and it just has begun:
Annoying intermittent vibration felt in shifter when in gear. Cycles on and off, 5 seconds vibration, 5 seconds gone.
Definitely in the driveline. Feels like a bad bearing.
At all speeds.
Vanishes when I put in clutch.
The vibration is most strongly felt in the shifter.
But it of course I feel it throughout the car.
It disappears when rolling in neutral.
Does not seem to be the clutch.
It recedes almost completely, but not quite, when the clutch is depressed.
This is a new problem, as I've had the car for 2 years.
Replaced U-joints and rear bearings. 6 month old tires all around.
Maddening. Please help me diagnose.
Thank you so much.
~Ricardo Furioso
ps-I'm sorry I've had to repost this, but I still can't figure out what it is. Thanks again for suggestions.
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
I cannot tell from your post, did you check or replace the driveshaft u joints, or rear axle u joints? If the clutch is engaged, and you play with the throttle to apply no load to the driveshaft, does the problem change? Are the c beam bolts tight?
Last edited by bjankuski; Jun 28, 2019 at 12:48 PM.
Safety Car
Joined: May 2001
Posts: 4,759
Likes: 1,647
From: Fairfax Virginia
The little bushing or bearing they use on the Clutch pilot shaft can go bad and make some strange sounds. When you push the clutch in it could stop the noise. I have seen this happen on other manual transmission vehicles. The only way to fix it is to remove the transmission and install a new one in the flywheel. I found this description for you.
When the clutch is disengaged, the transmission's input shaft and the engine's crankshaft are rotating at different speeds. The pilot bearing allows for this difference. This is why a faulty pilot bearing makes its most noise when the clutch pedal is completely depressed and the clutch itself is completely disengaged.
I have heard noise that was from the pilot bearing that went away when you let the clutch out. I guess it happens either way.
Just another wacky idea!
Best regards,
Chris
When the clutch is disengaged, the transmission's input shaft and the engine's crankshaft are rotating at different speeds. The pilot bearing allows for this difference. This is why a faulty pilot bearing makes its most noise when the clutch pedal is completely depressed and the clutch itself is completely disengaged.
I have heard noise that was from the pilot bearing that went away when you let the clutch out. I guess it happens either way.
Just another wacky idea!
Best regards,
Chris
Instructor
Joined: Jun 2015
Posts: 128
Likes: 13
few guesses: fluid level in the trans low, causing a trans bearing to spin in it's bore? Pitted bearings in the trans causing the same thing? Or the Thrust bearing on the crankshaft bad?
I'd check the trans fluid level, and try disconnecting the A/C compressor clutch to see if it makes a difference....
Good luck.
I'd check the trans fluid level, and try disconnecting the A/C compressor clutch to see if it makes a difference....
Good luck.
