pachanga_rick

My 250 Started running rough just before winter and the "check engine" light came on. I went to Auto Zone and the code read "misfire on cylinder #2". I figured this would be a easy fix once it gets warms so I put her away for winter.

Fast-forward to now.

I Changed all the plugs (they were due) and re-set the codes. Well she started missing and running rough at idle and it said "misfire on cylinder #2" again.

Next: I swapped coil packs between 1 & 2, assuming if it was the coil pack the problem would move to cylinder 1. After a short amount of time driving the code tripped again and said "misfire on cylinder #2".

Next: Last night I swapped my fuel injectors between # 1 & 2, but the code tripped again and says "misfire on cylinder #2".

I'm out of ideas ...


Any help would be great..

thefonz

I'd put my money on the plug wires. If you want to test to be sure, swap out with #1 or #3, (just make sure you change them at both ends, obviously) If the code for misfires to the other cylinder, you know it's the wire.
I just went through this with my wifes car, the wire was sparking good, but was still the problem. [2 cents]

pachanga_rick

Unless I'm missing something.. But I have no "Plug wires", only coil packs on each plug.

thefonz

Ok, difference between coil packs and coil on plugs (or COP's) I don't know about COP's. Hopefully someone else will chime in.

thefonz

I think you can use a noid light to test if the enjector is getting the signal or not.
Are the plugs wet or dry?

pachanga_rick

Thats next on the list, I'll be trying this later in the week when I have a free hour. I'm starting to think I may have a bad wire in the injector harness (the #2) and that could be the problem.

*

ebtdm

Basic question and it may be insulting, but in other threads there has been confusion as to the cylinder location on the engine. Are you sure you know where #2 cylinder is located? You seem to have swaped out all that you can (Plug, COP, and even the Injector). The next thing is to ohm out the wires.