Jeep 5149168AI Electrical Ignition Coil

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Remove the engine cover(s) as necessary to access the components. Disconnect the negative battery cable from the remote ground terminal or battery. For the 2.4L engine, disconnect the electrical connector from the ignition coil and remove the bolt attaching the ignition coil to the valve cover. Grasp the ignition coil firmly and pull off the spark plug using a twisting motion. Installation is the reverse of removal. For the 2.7L/3.5L V6 engine, remove the upper intake manifold to access the coils. Disconnect the electrical connector from the ignition coil and remove the bolt attaching the ignition coil to the valve cover.

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.

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.

Installation is the reverse of removal. Tighten the ignition coil bolts securely.

To remove these coils, you need to remove the upper intake manifold.

After cleaning the coils, you should inspect each one for cracks, damage, and carbon tracking.

For an earlier type coil on the fenderwell, disconnect the primary wires and high-tension cable, and remove the mounting bracket bolts. If the coil is bad, loosen the clamp pinch screw and transfer the clamp/mounting bracket to the new coil.

Remove the distributor cap and rotor.

To replace the ignition coil on 1999 and earlier models, start by detaching the cable from the negative battery terminal. Mark the wires and terminals with numbered tape, then remove the primary wires and high-tension cable from the coil. Disconnect the coil mounting bracket and remove the coil/bracket assembly. Clean the outer case and check for damage. Clean the coil primary terminals and check for corrosion. Check the coil primary resistance by attaching an ohmmeter to the positive and negative terminals. Check the coil secondary resistance by hooking one ohmmeter lead to the primary terminals and the other to the high-tension terminal. If the resistances are not as specified, replace the coil. Install the new coil and hook up the wires, then reattach the cable to the negative battery terminal.