Misfiring car? Not sure what to do next?
I went to autozone and then ran a test on the code reader. I got back the P0303 or whichever one is the third coil. I tested the coil by pulling each cover off and testing the difference of each on the engines sound, no difference. So now I think it might be the spark plug on the third coil position? The car is a 2003 honda civic with 140k on it. Spark plugs haven't been changed as far as I know, bought this car used.
What do you think?
Thanks
Added (1). What I meant was that each time I removed a cover I heard a difference, so I've crossed out the ignition coils as a culprit.
If you are not hearing a difference in engine speed/sound when you are "pulling each cover off" you aren't doing anything! If you disable a coil, the engine will skip. If you already have a skip, and disable a good cylinder, it will Really skip!
Spark plugs are cheap. Be sure to not crack them when installing (that happens when the plug socket is too shirt for the plug).
To further isolate, learn how to disable a coil (just unplug the electrical connector) and find which cylinder is skipping. If #3 skips, move that coil to #4 and see if the skip moves.
If the skip stays on #3 you have eliminated nearly all electrical issues (very slight possibility of computer trouble, very, very, very slight!). The other issues would be a serious vacuum leak enough to be causing a whistle, bad injector, or most likely low compression due to a burnt valve.
I'd agree, invest in new plugs anyway. That may or may not do the trick but it probably needs them.
Do the cheapest easiest things first (spark plugs would be on of those item especially if suspected).
Could be - maybe you will have to try it as it probably needs new plugs anyway
At 140.000 miles it needs more. Your mechanic/dealer will do it. YOU are clueless… If you diconect a coil. You will KNOW it. At least buy a 30 dollar shop manual.It will save you money and teach you something
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