Jeep 56029129AF Ignition Coil

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First of all, to remove ignition coils on 2.7L, 3.5L, or 3.6L models, remove the air intake duct or upper intake manifold as needed. Disconnect the coil's electrical connector and remove the mounting bolt. For 2005 and earlier V8 models, disconnect the spark plug wire boot and remove the coil. For 2006 and later models, remove the engine cover(s), and air cleaner housing, and detach the coolant reservoir before removing the coil. Inspect the rubber spark plug boot and wire condition. Use a DVOM to test the coil's resistance and replace it if necessary.

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.

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.

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

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.

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.