FIRST, replace or swap the plug to a different cylinder. Heck, replace them
all! I've got a 2004 T&C that idled like crap. Dealer said it was normal. It
and finally threw a misfire code. I swapped wires, same cylinder. I checked
the plug, and it looked and fired fine in open air. Same resistance as the
others. I swapped the plug to a different cylinder, and the misfire code
folllowed the plug. Ran fine ever since. DC finally came out with a TSB that
says replace plugs and wires if the 2K4 T&C shows up with a misfire code.
Looks and open air firing isn't everything.
Injector replacement? Alot harder and more $$$$$ than plug replacement.
It's probably the wire. With the car off, pull the wire loose from the
plug and let it just rest back on the plug. Then start the car.
Gradually lift the wire back off the plug and look for arcing. You
probably have an arc out the side of the insulator tube to the metal tube
on the head.
I have had an ongoing issue with my '02. It was finally determined that
air in the fuel line was causing a false misfire code. The most common
causes of misfiring is the plugs/wires. Get Hyundai brand only, many
dealers "claim" that non-factory plugs/wires can cause misfiring. If
the issues persist is may be a dirty injector (try using injector
cleaner.) There can also be a very large number of other possible
causes, low compression, bad coil...
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