Have you had the timing belt replaced ? If not would be advisable to get done asap . An old belt may have jumped causing timing to be out .Could also test compressions .Re spark plug intervals ,plugs nowadays dont need changing as often i,e .
MasTec 1970
Ford says 100K and if you have 100K on your plugs you have wasted engouh fuel to buy 2 sets of plugs!(and this is under perfect conditions of the mechanical condition of the engine but, they start to become inefficient way before that! (the firing voltage requirement increases and then that starts to burn-up the rest of the ignition system up (wires, coil packs etc.) I Would replace @ 60K, They are right there (it isn't like they are under the intake plenum)
Source(s):
28 Year Master, L-1 Technician
2 months ago
Rick
100,000 miles.
Source(s):
Ford Master Technician.
How often should you change spark plugs on ford focus?
Answer:
According to the owners manual, they have platinum plugs that should be changed at 100,000 miles.
Posted Dec 20, 2011 (12 years ago)