Shaking vibration and all sorts of bad
Shaking vibration and all sorts of bad
I get this vibration when decelerating at around 3-2.5k rpm with my foot off the gas, if I tap the gas or put the clutch in and put it goes away.... I thought it was possibly the trans mount so I replaced it with urethane... the vibration is still there... replaced the drive shaft thinking it was the carrier bearing to a one piece aluminum and the vibration is still there... but now the whole car shakes at 80...I figure what else could it be???? The clutch works fine... engages fine and everything... no slipping...
But what else could be shaking so fu.&ing badly
But what else could be shaking so fu.&ing badly
Nope tires are balanced and car is aligned.... rear axels look good to me no visible wear or damage.... the vibration feels as though it’s coming from the the center of the car where the trans is located.... possibly dual mass failing ??
BANNED!!!
Joined: May 2017
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From: Washington State
Coupe 6MT Premium RAS
Usually when a DMFW fails they just get REALLY noisy and you have problems like it will feel normal for a few miles but after everything is heat soaked the springs go to crap and it feels like the car doesn't want to launch properly from a standstill and you have to rev the engine higher to compensate and other wonkyness. Not saying it's NOT the issue but I personally haven't seen a failure like that cause vibration, you might have a throwout bearing that completely died or some kind of issue in the transmission that is causing a massive vibration. I suggest taking it to Nissan for a diagnostic to see what their technicians think the problem is.
Keep in mind this is an INCREDIBLY noisy transmission, there is a reason Nissan decided to use an almost 30# DMFW because that's what it took to cancel out all that gear noise and vibration but if you are feeling a vibration in the chassis that's definitely not normal.
If you haven't already get under the vehicle and inspect the area around the Y-pipe for anything that may be loose and physically rattling against something, recheck torque on the propeller shaft and pull on those "new" u-joints to make sure that's not actually the problem.
Keep in mind this is an INCREDIBLY noisy transmission, there is a reason Nissan decided to use an almost 30# DMFW because that's what it took to cancel out all that gear noise and vibration but if you are feeling a vibration in the chassis that's definitely not normal.
If you haven't already get under the vehicle and inspect the area around the Y-pipe for anything that may be loose and physically rattling against something, recheck torque on the propeller shaft and pull on those "new" u-joints to make sure that's not actually the problem.
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Joined: Feb 2005
Posts: 470
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From: Severn, Maryland
You may want to inspect the motor mounts. On sudden deceleration, you are using the engine to slow the car, this causes torque on the engine and tranny assembly in the opposite direction from normal acceleration. A way to check this is to place the car in reverse and with the brakes applied, try to accelerate. Have someone watch the engine while you are doing this to see if it has excessive movement.
Last edited by Mr.GEE; Mar 25, 2018 at 12:28 PM.
Ill check that out, thanks. I switched to the poly mounts on the trans and rear diff and heard it can cause the engine mounts (if softer) to wear out quicker.
You may want to inspect the motor mounts. On sudden deceleration, you are using the engine to slow the car, this causes torque on the engine and tranny assembly in the opposite direction from normal acceleration. A way to check this is to place the car in reverse and with the brakes applied, try to accelerate. Have someone watch the engine while you are doing this to see if it has excessive movement.
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