Jeep 56028138AF Ignition Coil

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Follow similar steps but check all eight ignition coils. Clean the outer case, primary terminals, and high-tension terminal for any damage or corrosion. Check the primary resistance and replace the coil if it is not within range. There is no published secondary resistance value, so if the primary resistance is within range but the coil is still causing issues, try swapping it with an adjacent coil. If the misfire DTC follows the coil, it is likely defective.

Disconnect the electrical connector, remove the coil mounting nut, and detach the coil from the spark plug. For Hemi engines, follow similar steps but also clean the coil primary terminals and check for corrosion on the high-tension terminal. Measure the coil primary 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. If unsure, have the coil checked by a professional.

Start by removing the ignition coil unit. Clean the outer case and check for any damage or cracks. Clean the coil primary terminals and remove any corrosion with a wire brush. Next, check the coil primary resistance by connecting the ohmmeter leads to the outer terminals and the center terminal. Repeat this step for each coil. Then, check the coil secondary resistance by connecting one ohmmeter lead to the no. 1 terminal and the other lead to the no. 4 terminal. Repeat this step for each coil. Compare the measurements to the specified resistance values and replace the ignition coil unit if necessary. To replace the coil, remove the air filter housing and outlet hose. Mark the spark plug wires for proper firing order and remove them from the ignition coil. Disconnect the electrical connector and remove the coil pack mounting bolts. Finally, remove the coil from the engine compartment and install the new coil in reverse order.