Spark Timing Control: Description
Spark timing control system is used on 1977-78 1.8L and 1979 2.0L engines. This system aids in reduction of exhaust emissions by delaying spark port vacuum to distributor vacuum advance unit during acceleration. On 1979 models, system is operated by a spark delay valve, which is located in line between carburetor and distributor (Federal) or between water thermo valve and distributor (California).