How to check and fix a cylinder #1 firing problem. Cylinder, plug, or wiring?

You can test each spark plug, but disconnecting the wire as the engine is running. If it runs rougher, then that plug was good. If there's no change, then that plug may be bad. If it runs rougher, it could also mean the wire is bad.


To test the ignition coil (you may have one coil for each spark plug, or one for every two plugs, this part I am unsure of with your model) remove the wire from the plug and then remove the spark plug, then put the plug into the wire (DO THIS WITH THE CAR OFF). Start the car and while using INSULATED PLIERS touch the plug tip to a good ground spot such as the frame even the engine itself, but not to the battery. If there's a spark or crackling sound, then that coil is good.

You can test each wire by hooking it up to a voltmeter and setting the resistance to 20,000 OHM.
The reading will vary based on the length of wire. 12inch wire may register 6-7 while a 30inch wire may register 8-9. If it registers below 6 regardless of length, then the wire should be replaced.