GMC 19418996 COIL ASM,IGN

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Detach the cable from the negative terminal of the battery. Remove the distributor cap and rotor. Remove the distributor from the engine. Detach the pick-up coil leads from the module. Connect one lead of an ohmmeter to the terminal of the pick-up coil lead and the other to ground as shown. Flex the leads by hand to check for intermittent opens. The ohmmeter should indicate infinite resistance at all times. If it doesn't, the pick-up coil is defective and must be replaced. Connect the ohmmeter leads to both terminals of the pick-up coil lead. Flex the leads by hand to check for intermittent opens. The ohmmeter should read one steady value between 500 and 1500 ohms as the leads are flexed by hand. If it doesn't, the pick-up coil is defective and must be replaced. Remove the spring from the distributor shaft. Mark the distributor tang drive and shaft so that they can be reassembled in the same position. If the distributor is equipped with a Hall Effect switch attached to the top of the pick-up coil, remove the two retaining screws. Carefully mount the distributor in a soft-jawed vise and, using a hammer and punch, remove the roll pin from the distributor shaft and gear. Remove the distributor shaft. Remove the driven gear and spacer washers from the end of the shaft, making sure to note the order in which you remove any spacers. Remove the shaft from the distributor. To remove the pick-up coil, remove the thin "C" washer (on four-cylinder models) or the retaining clip. Lift the pick-up coil assembly straight up and remove it from the distributor. Note the order in which you remove the pieces. Reassembly is the reverse of disassembly. Installation is the reverse of removal.

To check the High Energy Ignition System (HEI), begin by disconnecting the battery's negative terminal. Test the coil for opens and grounds. On the high scale, connect the ohmmeter leads; it should show a very high or infinite resistance value. On the low scale, check the coil's primary resistance, which should indicate a very low or zero resistance value. Also, check the coil's secondary resistance on the high scale; it should not show an infinite resistance. If any values are off, replace the coil. For removal, unplug the coil's high-tension wire and electrical leads, and remove the mounting nuts to take out the coil. The installation process is the reverse of removal.

To check the ignition coil, start by connecting one lead of an ohmmeter to the terminal of the ignition coil lead and the other lead to the ground. Flex the leads by hand to check for intermittent opens, and the ohmmeter should always indicate infinite resistance. If it doesn't, the ignition coil is defective and needs to be replaced. Next, connect the ohmmeter leads to both terminals of the ignition coil lead and flex the leads by hand again. The ohmmeter should read a steady value between 500 and 1,500 ohms as the leads are flexed. If it doesn't, the ignition coil is defective and should be replaced. To remove the ignition coil, start by detaching the cable from the negative terminal of the battery. Then, remove the distributor cap and rotor, and if necessary, remove the distributor itself. Remove the spring clip from the distributor shaft and mark the distributor tang drive and shaft for reassembly. Set the distributor in a vise with a shop rag to protect the shaft, and use a hammer and punch to remove the roll pin from the distributor shaft and gear. Lift the ignition coil assembly straight up and remove it from the distributor, noting the order in which the pieces were removed. Reassembly is the reverse of disassembly.

You should measure the coil resistances with an ohmmeter. If any of these resistance checks fail, you should replace the coil.

To check the Distributorless Ignition System (DIS), make sure the coil receives battery voltage with the ignition key ON (engine not running).

Start by detaching the cable from the negative terminal of the battery.

Remove the distributor from the engine.

Remove the mounting fasteners to separate the coil from the engine.

To separate the ignition coil from the bracket, you should drill out the centers of both rivets with an appropriate drill bit, then use a punch to knock out the rivets. After that, attach the new ignition coil to the bracket using screws, which should be provided with the new ignition coil. Finally, reattach the ignition module to the bracket.

Detach the coil high tension lead and primary wire connector.

Remove the driven gear and spacer washers or springs from the end of the shaft - be sure to note their installed order.

Start by detaching the cable from the negative terminal of the battery. Then, remove the distributor cap and rotor, and if necessary, remove the distributor itself. Remove the spring clip from the distributor shaft and mark the distributor tang drive and shaft for reassembly. Set the distributor in a vise with a shop rag to protect the shaft, and use a hammer and punch to remove the roll pin from the distributor shaft and gear. Lift the pick-up coil assembly straight up and remove it from the distributor, noting the order in which the pieces were removed.

If the ohmmeter does not indicate infinite resistance, it means the pick-up coil is defective and needs to be replaced.

After the initial steps, you should remove the air filter housing and disconnect various electrical connectors and wiring harness clips.

Before removing the ignition coil pack assembly, it is recommended to mark the positions of the spark plug wires.

To check the Distributorless Ignition System (DIS), make sure the coil receives battery voltage with the ignition key ON (engine not running). Use an ohmmeter to check the secondary resistance for each coil pack and the primary resistance for each coil pack. Refer to the specifications for the correct resistance values. For removal, detach the battery cable, unplug the electrical connectors from the module, label and detach the plug wires at the coil assembly if not numbered, and remove the module/coil assembly by taking out the mounting bolts. Installation is the reverse of removal, ensuring proper connection of the coils to the module and fully seating all plug wires.

To check the High Energy Ignition System (HEI), start by disconnecting the battery's negative terminal. Use an ohmmeter to test the coil for opens and grounds. First, on the high scale, connect the ohmmeter leads; it should show a very high or infinite resistance value. Then, on the low scale, check the coil's primary resistance, which should indicate a very low or zero resistance value. Also, check the coil's secondary resistance on the high scale; it should not show an infinite resistance. If any values are off, replace the coil. For removal, unplug the coil's high tension wire and electrical leads, and remove the mounting nuts to take out the coil. The installation process is the reverse of removal.