The problem:
At certain points during the acceleration curve, when its at the highest stress level, my 01 civic starts to have some serious misfiring issues. Usually between 3 - 4k rpms the engine in my civic starts to have random (per the engine codes) misfiring on all of its cylinders.

Its not the plugs or the fuel pump. Can anyone think of where I should go next? I am absolutely stumped on this one.


Any help is greatly appreciated.
Thanks

 

CEL on?

 

Well, if the codes say misfiring on cylinders, then you have to look at your ignition system. Somewhere along it, there is a problem. Problems can include bad spark plug wires (arching all over the place), alot of moisture under the hood (affecting your coil or wires) and a slue of others. I would go with the cheap way first and use some ignition dry and go, it helps protect the wires from moisture and usually in a couple treatments, it stops the misfiring. But thats not a fix, its temporary, but if it solves the problem, you need to get new wires. You said you already checked the spark plugs.....have you checked for spark from each plug manually? Maybe a coil might be fouling up?

 

Possibly ignition module.

Fun way to check to see if the wires are arcing. After dark, leave all lights off and start car. Observe for arcing, dancing lights. None? Using a spray bottle on 'SPRAY', spritz down the wires. Dancing lights? No, then it's likely not the wires.

 

Red Hot got it right on the penny. Looking for arching is simple and should be tried before you go buying parts. Let us know how it turns up!!

 

and just throw on some new ground wires. you can make them for a couple bucks, or buy a premade set. its not a bad idea anyway. stock engine grounding wires are barely adequate when new, once they age, you can get all sorts of nasty habits.