ive been having a problem with my car bucking lately at about 2500 rpms and other misc. parts of my power band. but today when i was on my way to work it bucked violently and my tach went ape **** and my car turned off and was hesitant to turn back on (luckily it did). but what could cause this, i was thinking dizzy or a part of the dizzy assembly (igntion coil, rotor cap, etc.), i was also thinking an o2 sensor since my car is running rich.

d15b jdm sohc VTEC - only CEL is code 21 VTEC spool solenoid (not related)

 

Possible your ignition coil

 

would there be physical evidence that it's damaged?

 

im experiencing the same problem right now with my jdm zc sohc vtec and i was thinking about the ignition coil as well. im towing it to the shop tommorow and im gonna give it a try. did ur speedometer come in and out when ur tach went crazy?, mine did lol. let me know how things go for ya, ill be sure to do the same

 

ya know im not sure, but probably. my car broke down on the freeway today but i think it was a VTEC controller ~ ecu error resulting in several blown fuses, controller is coming out tomorrow to eliminate that as a possibility.

please, no one chime in about me using a VTEC controller, unless you've owned one and done some homework on it.

 

bump

bucking went away, but now my tach goes nuts every once in a while and my motor misfires.

 

it sounds as if it is your ignitor which is located in your distributor. It runs about $100 for this part, the cheapest route would be to replace your whole dizzy for about $150 in case you have other issues with your coil or other wiring in your dizzy.