1991 accord exr is shaking erractively

transmission unit is faulty, check it

best option is to replace whole thing

is it the engine itself shaking or is it more of a pulsing feel in the brakes?

hi first check your wheel balance

Sounds like an idle air control valve issue. these can stick open and cause surging. That would be my first step.

Since the 91 model is obd1 there is no scan tool that can be hook up to it,but on the right kickpanel there is a two pin connector you can jump with a simple tool like a paper clip with the key on and the engine not running and this will cause the the mil to blink your code you will get a two different blinks a long one and a short one you combine both to get the code.example two long ones followed by one short is a code 21.

I'm no expert but it sounds like it could be a bad motor mount and since it's a 91 it could have rotted out cuz i know honda's have rubber in their motor mounts.

you might wanna get your balljoints looked at

My '91 626 did the same thing. I tested the throttle position sensor, and it was good so that wasn't it. The other likely culprit is the Idle Speed Control valve, or Idle Air Control valve, which is a $500 part new (more than I paid for the whole car). I pulled one off a 626 at the salvage yard and got it for 3 bucks, put it on (it's an easy DIY, just 4 philips screws holding it to the intake manifold), however I can't be sure that solved the problem, since I haven't run the car much since then. It would seem the most likely cause, tho, and a cheap fix if you go used. Other possibilities: O2 sensor or Mass Air Flow sensor?

replace mail relay