High Power Ignition System (HEI)
1. Disconnect the wire from the negative battery terminal.
Examination
2. Check ignition coil for open and short to "mass", by doing the following three checks with an ohmmeter (see illustration).
7.2. To test the ignition coil, use an ohmmeter to perform the following three tests: 1 - when installing an ohmmeter to measure high resistances, the arrow of the device should point to "infinity", 2 - when setting the ohmmeter to measure low resistances, the arrow of the device should indicate a value close to zero, 3 - when setting the ohmmeter to measure high resistances, the arrow of the device should not point to "infinity". If the meter readings differ from those given above, the coil should be replaced
3. Having set the high resistance measurement scale on the ohmmeter, connect its leads as shown in the illustration (see check N1 in illustration 7.2). The ohmmeter should show a very high resistance value or even "infinity". If the reading is different, replace the coil.
4. Having set the scale of measuring low resistances on the ohmmeter, connect its leads as shown in the illustration (see check N2 in illustration 7.2). The ohmmeter should show a very low, down to zero, resistance value. If the reading is different, replace the coil.
5. Having set the high resistance measurement scale on the ohmmeter, connect its leads as shown in the illustration (see check N3 in illustration 7.2). The ohmmeter should not show "infinity". If the measured resistance is "infinity", replace the coil.
Withdrawal
6. Disconnect the high voltage wire and both electrical outlets from the ignition coil.
7. Loosen nuts (see illustration), remove the ignition coil from the engine.
7.7. Places of installation of bolts of fastening of the coil of ignition (shown by arrows) on 3.1 l engine
Installation
8. Installation of the ignition coil is carried out in reverse order.
Direct ignition system (DIS)
Examination
9. First of all, refer to section 6 and perform the checks of the ignition system described in it.
10. Using an ohmmeter, measure the resistance of the secondary winding of each coil (see illustration). The resistance ratings are listed in the technical data in this chapter.
7.10. Measure the resistance of the secondary winding of each ignition coil
11. Then measure the resistance of the primary winding of each ignition coil (see illustration). The resistance ratings are listed in the technical data in this chapter.
7.11. Measure the primary resistance of each ignition coil
Replacement
12. Disconnect a wire from a negative conclusion of the storage battery.
13. Disconnect all electrical contacts from the unit.
14. If the high voltage wires are not numbered, number them and disconnect them from the coils (see illustration).
7.14. Each high voltage wire has its own number stamped on the top of the ignition coil
15. Turn away bolts and remove coils and the block of ignition from the car (see illustration).
7.15. Carefully remove the coils from the ignition unit
16. Having unscrewed the bolts, disconnect the ignition coils from the block (see illustration 7.14).
17. Installation is carried out in the reverse order.
18. At installation of coils of ignition watch correctness of connection of their conclusions.