Mopar 5149049AB Ignition Coil

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To check the 3.7L V6 and 4.7L V8 engines' ignition coils, start by removing the ignition coil and cleaning the outer case for any damage. Clean the coil primary terminals and check for corrosion on the coil tower terminal. Use a wire brush to clean any corrosion found. Next, check the coil primary resistance by attaching the leads of an ohmmeter to the two terminals of the connector. Compare the measured resistance to the specified range and replace the ignition coil if it is not within range. To check the coil secondary resistance, connect one ohmmeter lead to the positive terminal of the connector and the other lead to the high-tension terminal. Compare the measured resistance to the specified range and replace the ignition coil if necessary. If the primary and secondary resistance values are within specification but the coil is still misfiring or causing a Diagnostic Trouble Code (DTC), try swapping it with an adjacent coil. If the misfire DTC follows the coil, it is likely defective. For the HEMI engine, 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. To remove and install the coils, remove the air intake duct and resonator box for the 3.7L V6 and 4.7L V8 engines. For the HEMI engine, remove the air intake duct and resonator box for cylinders 2, 4, 6, and/or Disconnect the electrical connector, remove the coil mounting bolts, and carefully pull the coil up to disengage the rubber spark plug boots. Inspect the condition of the rubber spark plug boots and replace if necessary. Installation is the reverse of removal.

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.