My wife's PT cruiser has been setting code P0304 (mis-fire cylinder #4). If I
clear the code it will come back in 2 or 3 days. It's not impacting the way the
car runs in any noticiable way.
Since the car was due for new plugs I figured that would be a good place to
start no sets code. I thought maybe I had a wire going bad so I swapped wires
for cylinder 1 & 4 to see if the code would move to cylinder #1 (P0304), nope
still P0304.
My question is how does the ecm sense that there has been a mis-fire? Is it
strikely looking to see if there has been a spark or is it looking for some
sort of change in rotationaly speed of the crank that would indicate the
mixture did not ignite (i.e. bad injector). I begining to think it might be an
injector issue but don't want to did that far into it unless I know that the
ecm could sense this.
I am past the 3/36 bumper to bumper warranty and into the 7/70 power train
emissions warranty which I belive would cover this but with a deductable. If
it's as simple as a new injector (about $45) I will do it myself.
Thanks in advance for any input.
Dave Clement
99 SLT+ CC 4x4
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