Jeep 5149049AB Ignition Coil

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To check the 3.7L V6 and 4.7L V8 engines' ignition coils, begin by removing the coil and cleaning the outer case. For the HEMI engine, clean the outer case, primary terminals, and high-tension terminal. Check the primary resistance and replace it if not within range. To replace, remove the air intake duct, resonator box, and disconnect the electrical connector, remove the coil mounting bolts. To reinstall, switch the removal steps going from the final step to the beginning step.

To check the 3.7L V6 and 4.7L V8 engines, start by removing the ignition coil and cleaning the outer case for any damage. Clean the coil primary terminals and check for corrosion. Use an ohm-meter to measure the primary resistance across the two terminals of the connector. Compare the measurement to the specified range and replace the ignition coil if necessary. To check the secondary resistance, connect one ohm-meter lead to the positive terminal of the connector and the other lead to the high-tension terminal at the coil and the spark plug wire terminal. Compare the measurements to the specified range and replace the ignition coil if needed. If the resistance values are within range but the coil is still misfiring or causing trouble codes, try swapping it with an adjacent coil. If the issue persists, consult a professional. For the 3.6L V6 and HEMI engines, follow similar steps but note that for HEMI engines, it may be easier to check certain coils on the bench. Clean the outer case and terminals, measure the primary resistance, and swap coils if necessary. For replacement, remove the necessary components, disconnect the electrical connector, and remove the ignition coil. Install the new coil by reversing the removal steps.

After inspecting the coils, you should make sure that each coil fits securely onto the spark plug(s).

If you find any damage on the coils, you should replace them.

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.

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.

Follow similar steps but note that for HEMI engines, it may be easier to check certain coils on the bench. Clean the outer case and terminals, measure the primary resistance, and swap coils if necessary. For replacement, remove the necessary components, disconnect the electrical connector, and remove the ignition coil. Install the new coil by reversing the removal steps.