GMC 12498046 Ignition Coil Kit

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On L4 engines. remove the distributor cap. On L4 engines, label the spark plug wires as to their position on the cap and remove them. On V6 engines, remove the spark plug wire retaining ring from the top of the distributor. Remove the coil cover from the distributor cap. Note the position of each wire, duly marking them if necessary. Remove the coil ground wires then push the leads from the underside of the connectors. Remove the coil from the distributor cap. Installation is the reverse of the removal procedure, but ensure that the leads are connected to their original positions. Damage to the control module and ignition coil can result if the leads are connected incorrectly.

Start by removing the distributor cap and disconnecting the coil. Use an ohmmeter to check the resistance across the primary connections, ensuring it is close to zero. Then, test the resistance between the primary ground and the coil secondary connector, using both solid wire and dotted line connections. If the readings are infinite, the coil needs to be replaced.

After removing the distributor cap on L4 engines, you should remove the coil cover from the distributor cap.

Use an ohmmeter to check for continuity between each of the pick-up coil connector terminals and the distributor body. If continuity is indicated, the pick-up coil is shorted to ground and needs to be replaced.

Testing involves connecting an ohmmeter between the pick-up coil lead connector and the distributor housing, with the ohmmeter indicating infinite resistance. Connect the ohmmeter between both terminals of the pick-up coil lead connector, and it should show a steady value between 600 and 1600 ohms.

Start by removing the distributor cap and using an ohmmeter to measure the resistance across the TACH and BAT terminals at the distributor cap.

Turn the four latches and remove the cap and coil assembly from the lower housing.