so i gave my sister my 2002 acura cl type s. She did not know that she needed to put in 91+ octane and i forgot to mention it to her. so she put regular unleaded for the last 3 months and now she has all 6 cylinder misfires and random misfires. Can anyone help me get started?

 

you don't 'need' to put 91 in.. but that's a debate for another thread. the car will adjust its timing to the lower octane. i've never had a CEL from using 87 octane.


it's possible that one of the coil packs is out giving you this CEL though.. although it is unlikely as you said all cylinders misfire.

 

One bad coil pack will throw codes that more or all cylinders are misfiring. Check to see if the engine changes sound when u unplug each coil one by one. If the noise doesn't change its either the coil pack or spark plug. then swap the coil pack with a dif one (a good one that's on the engine). If the misfire moves to the cylinder that u swapped the coil pack with. Then that coil pack is bad

 

thanks guys will check it out and report back