Q: How do you remove the ignition coil assembly on Cadillac DeVille and DTS?
A: To remove the ignition coil assembly, start by disconnecting the negative Battery Cable and removing the intake manifold service cover. Then, disconnect the electrical connector from the ignition control module and remove the radiator support cover, moving the radiator hose out of the way. Next, remove the ignition coil assembly bolts in the indicated sequence and take out the assembly from the valve cover. Inspect the spark plug boots for carbon tracking and deterioration. When installing the ignition coil assembly, tighten the mounting bolts gradually and evenly. For the rear ignition coil assembly, follow the same steps but also remove the Air Injection Reaction (AIR) vent solenoid. If replacing the ignition control module, tighten the mounting bolts in the indicated sequence. Finally, install the AIR vent solenoid and reverse the removal process for installation.