IntroductionThe ignition systems used on the gasoline-engine cars covered by this manual incorporate many technologically advanced components to maximize engine performance and reliability in the face of increasing restrictions on engine exhaust emissions. The ignition system, in cooperation with the fuel system, precisely controls engine operation to ensure maximum power and efficiency from the engine under all operating conditions. While diesel-engined cars do not have a spark-ignition system, the glow plug system is essentially an ignition assist system, and is therefore covered here also. Proper function of the glow plug system is essential for starting a cold diesel engine, and greatly enhances the starting process at any temperature. Due to the use of sophisticated electronics to operate and control these modern ignition systems, the need for routine maintenance is reduced and troubleshooting can be more difficult. Any service or repair work must be carried out carefully, with special attention to the cautions and warnings and proper working procedures. Most necessary service and repair information is provided here, although some of the operations that are described may be of practical value only to professional mechanics. If you lack the skills, or the special tools and equipment, we suggest you leave the service and repair of the ignition system to an authorized Volkswagen dealer or other qualified repair shop. We especially urge you to consult your authorized Volkswagen dealer before attempting any repairs on a vehicle still covered by any warranties. |
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