How to replace the Ignition Coil in a DeLorean DMC-12 V6 PRV BOSCH скачать в хорошем качестве

How to replace the Ignition Coil in a DeLorean DMC-12 V6 PRV BOSCH

Preventative maintenance replacement of the BOSCH ignition coil in an '83 DeLorean. One of the easiest replacements you can do on your own. Remember to always disconnect the battery before doing any electrical work on the car. An ignition coil (also called a spark coil) is an induction coil in an automobile's ignition system that transforms the battery's low voltage to the thousands of volts needed to create an electric spark in the spark plugs to ignite the fuel. Some coils have an internal resistor, while others rely on a resistor wire or an external resistor to limit the current flowing into the coil from the car's 12-volt supply (as is the case in a DeLorean, using a compensating resistor). The wire that goes from the ignition coil to the distributor and the high voltage wires that go from the distributor to each of the spark plugs are called spark plug wires or high tension leads. Originally, every ignition coil system required mechanical contact breaker points and a capacitor. More recent electronic ignition systems use a power transistor to provide pulses to the ignition coil. A modern passenger automobile may use one ignition coil for each engine cylinder (or pair of cylinders), eliminating fault-prone spark plug cables and a distributor to route the high voltage pulses. The DeLorean uses one ignition coil for all six cylinders. The DeLorean is equipped with a Bosch electronic ignition system. This breakerless ignition system is similar to a conventional ignition system except for the following modifications: The breaker points in the distributor. have been replaced by.a pulse generator consisting of a stator. an induction coil and a trigger wheel. The pulse generator is connected to an electronic control unit (ECU) module in which the signal f rain the distributor is converted and amplified. The ECU module is connected to a high voltage ignition coil. DeLorean Ignition System Components COMPENSATING RESISTOR: A dual resistance ballast resistor is used to control primary circuit voltage and current flow. When the ignition switch is in the run position, the current flow is reduced by the resistor to prevent overheating of the coil during operation. To provide increased coil voltage for starting the engine, one-half of the resistor is bypassed.during the engine cranking process. By reducing the circuit resistance, the coil primary voltage and current will increase, thus increasing the secondary output voltage. IGNITION TIMING ADVANCE: The Bosch distributor provides timing advance by means of a centrifugal advance unit and a vacuum advance unit the same as a conventional distributor. SPARK PLUGS AND WIRES: Bosch HR6DS spark plugs are used with carbon core secondary wiring. Spark plugs are gapped to 0.6 - 0.7 mm (0.024 - 0.028 in). DISTRIBUTOR CAP AND ROTOR: A conventional distributor cap is used with a 5,000 ohm rotor for radio suppression. ''CAUTION" When the engine is running, dangerously high voltage which may prove fatal may be present in the primary circuit of the coil and in all wires connected to terminal # 1 of the coil. System Repair Notes 1. Before working on the vehicle with the ignition switch in the "run" position and the engine not running. disconnect ter·minal #15 on the coiI. 2. Before working on the ignition system. always ensure that the ignition is in the ··off" position. 3. The ignition timing is adjusted in the same manner as ~a conventional system using the timing marks on the crankshaft pulley and the timing chain cover. Connect timing light to # 1 cylinder plug wire. 4. If it is necessary to replace the ignition coil. use the proper replacement part designed for this particular system. 5. The ignition distributor is serviceable and repair parts are available. The cap and rotor can be removed without removing any engine components. To remove the complete distributor, it is necessary lo loosen the fuel inlet system to provide sufficient clearance for remov'al of the distributor assembly. 6. THE ECU module cannot be repaired or adjusted. It is located in the bottom of the module compartment behind the driv.er's seat. The ignition ECU module is silver in color and is mounted under the black idle speed ECU module. 7. The ignition coil is located behind the black plastic cover in the right front corner of the engine compartment. 8. The compensating resistor is attached to the firewall at the left front corner of the engine. 9. The ignition distributor is located under the intake manifold on the L.H. cylinder head and is driven by the L.H. camshaft. 10. A defective or improperly wired compensating resistor will cause premature ignition coil failure. Before replacing a coil, refer to the wiring diagram for proper wiring and resistance values. 11. When replacing spark plugs. it is extremely important to install the new plugs without lubricating the plug threads and torque tighten them to the proper specification.