I have a 1990 Honda Accord EX 2.2L automatic. I have had a problem with the engine vibrating while it is in gear at idle. I have read through past posts and almost all have suggested that motor mounts are the problem. Indeed, I have replaced three of the four mounts ( the rear, the transmission and the torque mount.) and still have the same vibration problem, although slight slightly improved. I bought all the mounts on-line from eBay, including the rear mount with the vacuum solenoid. Originally, I replaced the torque mount first after noticing that it was ripped. A month later I replaced the rear mount believing that would fix the problem. When that failed to stop the vibration, I replaced the transmission mount. All that is left is the driver's side mount, but it looks like it is good. I have replaced the wires and plugs and I have replaced the spark plug tube gaskets and valve cover gasket as well as having the valves adjusted. (These were needed repairs having nothing to do with the vibration.) The car does not vibrate when in park or neutral where it idles at about 850 rpm. when it is in gear, the car idles at about 750 rpm and I have the vibration problem, which disappears if I give it just a touch of gas. I have read that this could be an IACV problem. Does this sound like it is my next step? I am selling the car and truthfully, I'm most likely already going to lose a little money on the car so I don't want to spend much more money or time on it, but I would really like to have this problem fixed before I put it up for sale. I would appreciate an help I can get with this problem.
Thanks!

 

My old Accord did the same thing, I don't think they fixed that until the 94 and up models. I'm not sure if there is an idle adjustment screw on the throttle body or not, if there is I would just turn it up. Cheap and easy fix.

 

Clean the throttle body and do an idle reset. When the car is stone cold, pull off the battery cable for 10 min, replace the cable and start it up and let it idle till it warms up fully.

 

I have a 2002 accord which is also vibrating in gear at idle and subsides when in neutral. I just got my transmission rebuilt as well as the front and back mounts replaced. The garage took another look at my car to check for anything loose or things touching that may be transferring a vibration. They couldn't determine anything, the only other possibility they offered is that with my new torque converter I am feeling the motor working more (as opposed to when there was more gaps and slipping with the old TC?!). The car seems to run fine and isn't doing anything else strange, it's only when I'm stopped at a red light that I really notice the vibrations (which sometimes can be felt in the seats). Is this a concern I need to pursue? Any suggestions?