Changed the spark plugs and wires on my 99 Taurus with the 24V Duratec V6 and you have to take off the upper manifold for access. It only has 62,000 miles so it wasn't too dirty, but I cleaned the lower manifold.
Before,
After,
Does this make a noticeable difference in performance? The upper intake is similarly dirty. Should I clean that too?
Before,
After,
Does this make a noticeable difference in performance? The upper intake is similarly dirty. Should I clean that too?