00' cutlass misfiring

I got new plugs new wires and my 6th cylinder is still miss firing. I'm basical asking what should check out next. I'm down for anything.


thanks

Just make sure that the 6th spark plug hole around it is not wet.

Usually the best way to replace the spark plugs is to use a pressurize air to blow away any dirt, debris, water, etc., at the base of the spark plug before removing it.

You can swap the ignition coils and see if the mis-firing follows the new location. Normally for V6 engines, there are 3 ignition coils. One coil controls 1 & 4, another coil controls 3 & 6, then another coil controls 5 & 2.

Since the problem you are having is the 6th cylinder then you have to remove the ignition coil that controls 3 & 6. You can either remove the ignition coil that controls 1 & 4 or the ignition coil that controls 5 & 2 and put that in place of the ignition coil that controls 3 & 6.

If you decided to swap the ignition coil that controls 1 & 4 with the ignition coil that controls 3 & 6, don't move around the spark plug wires. Just make note where the spark plug wires go and write it down. Again, you are just swapping the ignition coil.


Once you have swapped the ignition coil and if the mis-fire has moved to their 1 & 4 cylinder then you know that the ignition coil with a mark 3 & 6 is bad and you need to replace it.

Go to a junkyard or get a new replacement ignition coil. BTW, you might want to remove the ignition coils and clean the connectors.

If the mis-fire did not moved to the cylinders 1 & 4 then probably the ICM (Ignition Control Module) is failing. Make sure that the fuel injector is not acting up. Use a bottle of fuel injector cleaner and water remover in the gas tank and see if that helps.