Terrible engine vibration when in gear and standing still - Nissan Forums : Nissan Forum
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post #1 of 11 Old 07-14-2012, 01:31 PM Thread Starter
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Exclamation Terrible engine vibration when in gear and standing still

I know one of the engine mounts, if not more, has to have gone bad however I cannot tell which one. Far as I can see they all appear to be fine. When the car is put into either Drive or Reverse and stopped, then engine vibrates terribly...just replaced the serpentine belt because it shook so much it jumped.

Any ideas which mount could be bad? How can I determine which mount has gone bad? I can't drive the car because I'm afraid the belt will jump again and possibly cause more damage.

Thanks in advance guys.

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post #2 of 11 Old 07-14-2012, 01:54 PM
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Replace the passenger mount to fix the notorious clunking sound. This is the easiest mount to replace.

Replace both front and rear mounts to better the vibrations you're experiencing.

The driver side mount should be fine.


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post #3 of 11 Old 07-14-2012, 04:20 PM Thread Starter
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Pulled the passenger mount and it was ripped underneath the center bolt. I asked a local Nissan tech over the phone what the likelihood another mount had gone bad...he said last year he replaced 126 of the passenger mounts versus 8 of the next highest which was the transmission mount.

Will post after replacement and ensuring that was the only one that was bad.
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post #4 of 11 Old 07-14-2012, 04:24 PM
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I was hoping my passenger mount would've solved my vibration issues but not very much. But still better than before.

And the clunking sound was gone at least.


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post #5 of 11 Old 07-14-2012, 06:03 PM Thread Starter
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Replaced and violent shaking is gone HOWEVER, it's still shaking a bit. Upon inspection the automatic tensioner is vibrating and moving quite a bit. Going to replace that today or tomorrow. Also, the crank pulley appears to be off by about 1mm. Any idea which way it's threaded...clockwise or counter-clockwise?

On a side note, the engine shifts forward or backward when placed into Drive and Reverse. I don't know how much it is supposed to shift it at all, but it appears to be excessive.
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post #6 of 11 Old 08-03-2012, 07:53 AM
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if vibration stop when car is running, Vibrates while in idle or when you are in the traffic, vibration stop when you put your gear to Neutral, vibration stop when you turn off the aircon, the most likely problem is your timing chain.
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post #7 of 11 Old 08-04-2012, 02:12 AM
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no, most likely alternator clutch binding. Check for belt flop. If belt is flopping it's way more likely to be alternator than tensioner.
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post #8 of 11 Old 08-09-2012, 02:39 PM Thread Starter
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Replaced alternator and noticed significant improvement however there's still a lot of engine movement when engaging gears.

Going to replace front engine motor mount (bow-tie) and see if that keeps it steady. The rear appears to be solid so I don't think it could've gone bad..instead just acting as a pivot point for the front to move up and down.
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post #9 of 11 Old 10-18-2012, 02:55 PM
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Have you replaced the front mount and was there any imrprovement?

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post #10 of 11 Old 01-09-2016, 01:36 AM
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Solution

Hey guys, I know this is an old post, but I thought I would provide the solution to this issue for future reference. I just rebuilt my KA24de in my 1995 240sx, and I had similar issues. My car would shake violently when I first put it into any gear, and when the vehicle comes to a stop. During the rebuild, I replaced both my engine mounts, so I new that was not the problem. Also, you should be able to see the engine shaking quite a bit if it has a bad engine mount. I then replaced the transmission mount, and it did not solve it.

Solution:

(This is how I fixed my 1995 240sx with KA24DE engine)

I replaced the idle air control valve, because my old one was broken at some point. The IAC needed to be adjusted to suit my vehicle. Therefore, the TIMING and IAC should be simultaneously adjusted according to the factory service manual. Once I got it dialed in, the shaking was gone.

Basic adjustment procedure:

Disconnect the throttle position sensor

Disconnect the electric cooling fan, turn off heating/AC, and put the car in neutral to put the car in a "no load" situation.

Simultaneously adjust the IAC screw and the distributor to achieve approximately 700 rpm and 20 deg BDC.

Rev the engine above 2000 rpm for around 2-3 mins

turn the car off

re-connect the throttle position sensor and electric cooling fan

crank the car

put in neutral

the car will try to adjust for the changes that were made to the IAC. You will hear the car adjust, kind of a single click type noise.

the RPM should now read approx 750 rpm

rev the engine above 2000 rpm for 2-3 mins

verify that the car is running at 20 deg BDC and at 750 rpm

Put it in reverse, and the shaking should be gone
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Last edited by dfstack22; 01-09-2016 at 01:39 AM.
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post #11 of 11 Old 02-03-2016, 01:12 AM
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The 3rd generation Altimas have electronic throttle control and thus do not have an IAC valve.
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