Q: How to Check the Ignition Coils of Jeep Grand Cherokee?
A: To check the 3.6L V6, 3.7L V6, and 4.7L VB engines' ignition coils, remove and clean the coil and use an ohmmeter to measure the coil's primary and secondary resistance and compare it to the specified range. If the primary resistance is within range but issues persist, try swapping the coil with an adjacent one. For Hemi engines, follow similar steps but also clean the coil primary terminals and check for corrosion on the high-tension terminal.