Yes - plug wires are a wear-item and will ultimately fail.
The good news is they last a whole lot longer than the 'old days'.
Since sparkplugs have a 100,000 mile change interval, I just do my wires at the same time - especially considering the effort it takes to get at the Windstar plugs/wires.
See "Related Questions" below for more
take it to dealer
Since the Monterey is the direct spin off of the 2003 Windstar, the information for the same question regarding the Windstar might be very applicable. (see below)
Is this a trick question ( as far as I know the last model year of the Ford Windstar was 2003 )
If you do not have any problems with plugs, change them when you replace the timing belt (do not forget to replace the spark plug wires too).
You should never need to replace the wires leading to the spark plugs. The 2003 Miata has a coil pack at each spark plug (inside the spark plug hole). The wires leading to the coils are low voltage and should never break down.
Broken spark plug wires will keep almost any car from starting.
The Toyota echo does not have wires or a rotor, each spark plug has its own ignition coil (coil pack). So really, all you can do is change the spark plugs.
How do I change spark plugs on Toyota rav 4 2003
No, it is not necessary to change the spark plugs on your 2003 Ford Winstar at 30,000 miles. It has Platinum Plugs from the factory and they have a life span of approximately 100,000 miles. I suggest checking the gap and cleaning them at 50-60M miles, but not replacing until around 100K.
i have an 03 aztek. i change plugs myself, i have skinny arms to reach from underneath the car.
What is the firing order of a 2003 or cruiser
At the end of the plug wires that don't connect to the spark module.