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theoldwizard1 wrote:enblethen wrote:
Plugs are not monitored by the ECM. the coil pack is the last point.
That is not an accurate statement.
What is actually monitored is does each cylinder give an equal amount of power for each combustion event. There are literally dozens of reasons why a cylinder is not "contributing" equally. Bad plug or bad coil are two. Admittedly they are easy items to replace.
If you have not replaced the plugs, do that first. Do all 8 as you are overdue. Stick with the EXACT SAME PLUGS ! (Motorcraft SP548 Why not ? The first set gave you good life !) Before you reinstall the coils, carefully inspect the inside of each boot. If you see any carbon tracking YOU MUST REPLACE THE BOOT ! Many auto parts stores do not stock just the boots (they would rather sell you the much more expensive coil) but they are available online.
Also put a dab of dielectric grease on the inside of each boot. They will side on easier and will be less likely to arc. If you do choose to replace the coil or can not find just the boot, again, stick with the exact same Motorcraft coil (DG542).
Amazon has good prices on both.
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