Shaking whole car vibrates while moving

[zitupbaby]

Hi Guys!

Say here is my problem: NOTE this car may have been in an accident before I owned it!!!

I have a 1993 Nissan 300zx with a few issues. This is my dream car and has served me well for many years until a few months ago.

I live in Wisconsin and plan to move to AZ, and I want to take this car. However, the thing that most worries me is a strong vibration through the whole car while I am driving down the road.

I have asked my mechanic and he kind of brushes me off like it’s no big deal. I think my car scares him; my car repairs always seem to be more complicated and complex then he first thinks.

The car only shakes when it is moving. The vibration gets worse just before the car s*** into the next higher gear. I have noticed that the shiatsu massage (the car shake/vibration) really kicks in when I keep the car at about 50 mph. I think this is because the transmission has not slipped into 5th gear yet. I could be wrong. Can this get worse with time?

If I accelerate slowly the vibration is worse. If I floor it the vibration is much less noticeable. I have to tell you that while driving down the road I have taken the car out of gear and stepped on the gas, the car runs smooth and vibration of any kind disappears. Put the car back in gear and give it gas, the vibration is back. I have noticed that any speed over 50 mph the vibration is very minimum, however if I accelerate slowly to get to any speed over 50 mph the car shakes (goes into shiatsu mode). If I floor it, once I reach my cruising speed it is smooth as silk, as long as I am going faster than 50 mph.

I think the culprit might be the drive shaft, or the balancer shaft (or something is out of balance). If it is one of these things what is wrong with the car and will it cost me a small fortune to fix?


1993 300zx
2+2 auto non-turbo
171,000 miles

[GrilledCheese33]

There are so many things this could be. For starters:

-Driveshaft
-Trans output shaft
-Motor Mounts
-Bent Wheels

etc, etc.

Judging by your description though it really sounds like a transmission or driveshaft issue to me. Good luck!

[Ace2cool]

I responded in the other thread.

car-shaking-while-driving-at-2000rpm-af ... 64208.html

[es.biggs]

Would you say the vibration happens at a certain RPM (for example 2200-2400) in each gear?

[BigTDogg (MA)]

From what you've described I'd say driveshaft center bearing or your transmission mount.

Both of which are easy fixes

[CrazedZ32Owner]

mine did that last year... turns out 2 of my lug nuts were loose, causing the wheel to come loose.... and it did the exact same thing yours is doing, i'd accelerate and it would appear to get better but as soon as i let off the throttle it started vibrating REALLY bad.... its may sound stupid but i'd check em

[zitupbaby]

hey thanks guys................looked under her on Friday and the center bearing is shot!

ordered a new one from Mitch at EPracing

Nick

[zitupbaby]

Hey guys had a the new drive-shaft installed today! Much better! thanks for the good advice!

[BigTDogg (MA)]

No worries, glad it was a relatively eazy fix.

[zain1003]

Would you say the vibration happens at a certain RPM (for example 2200-2400) in each gear?

i seem to have a similar problem, more specifically the one you described Es.
between 13-1900 rpm in any gear, my car SOMETIMES gets jumpy, the same feeling like when a car is about to stall. also my gas pedal starts feeling spongy and isnt responsive as its normally supposed to be. as soon as im out of that rpm range it seems fine, but it does it all the way up to 2500 rpm sometimes. any ideas? i asked a mechanic and its not my fuel pump as i thought before. he said fuel pumps are electric and should have a consistent flow rate. maybe fuel injectors? any ideas? again this only happen sometimes but i think it happens more often when my gas tank is low. maybe thats my imagination.