For 1993 and 1994 models, start by turning off the ignition and disconnecting the electrical connector from the coil. Check the coil primary resistance by connecting an ohmmeter across the two terminals of the coil connector. If the results are not as expected, replace the coil. Next, connect an ohmmeter across the secondary terminal and to the positive primary terminal. If the results are not as expected, replace the coil. To replace the coil, disconnect the cable from the negative terminal of the battery, disconnect the ignition coil electrical connector, disconnect the secondary high tension wire from the coil, remove the coil mounting bolts and detach it from the engine. Installation is the reverse of the removal procedure. Before installing the spark plug wire connector into the ignition coil, coat the interior of the boot with silicone dielectric compound. For 1995 and later models, with the ignition off, disconnect the electrical connector from the ignition coil. Connect the positive probe of an ohmmeter to terminal no. 1 and the negative probe to terminal no. 2 of the coil connector - the meter should indicate infinite resistance. Reverse the meter leads - continuity should be indicated, but not zero ohms. If the results are not as specified, replace the coil. Connect an ohmmeter between the secondary terminal and terminal no. 1 - the meter should indicate infinite resistance. If not, replace the coil. Check each coil in the same manner. To replace the coil, disconnect the cable from the negative terminal of the battery, disconnect the ignition coil electrical connector, remove the coil mounting screws and pull the coil up with a twisting motion. Installation is the reverse of the removal procedure. Before installing the ignition coil, coat the interior of the boot with silicone dielectric compound.