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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.
(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
Last edited by dfstack22; 01-09-2016 at 01:39 AM.