Editing Duraspark ignition (section)
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==DuraSpark-I ignition system== This California only version of the DuraSpark system is very similar to the DS-II, with the following exceptions: *DY204 module (red sealing block, a.k.a. "grommet") *Deleted coil resistor *Low-impedance high-energy ignition coil The DuraSpark-I system coil charging currents are higher than the DuraSpark-II, and designed to achieve better emissions and mileage through more complete charge burning, and improved ignition of lean air/fuel mixtures. To allow increased coil output, the coil resistor was deleted, and an electronic dwell circuit added to allow full saturation of the coil, yet prevent coil overheating. While the equivalent to GM's original HEI, it was limited to California-only as it was more advanced and expensive to produce. This high cost and limited availability is one reason the less-powerful DuraSpark-II conversions have historically been more popular. With the much greater availability in today's market, and prices reduced to DS-II equivalents, the DuraSpark-I is seeing a large increase in popularity for upgrades and conversions. The large distributor cap designed for the DS-I to help prevent terminal spark jumping was also standardized for all DuraSpark versions to reduce long-term maintenance. While the DS-I is capable of firing over 0.080" spark plug gaps, the factory recommended gap was 0.055-0.060" in most models - much wider than the DS-II. Ford part numbers for the DuraSpark-I module are D7AE-12A199-A1B, D7AE-12A199-A1E, D7AE-12A199-A2B, and D7AZ-12A199-A. Ford part number for the low-impedance DS-1 ignition coil is D7AZ-12029-A. However, due to the special dwell circuit, many other high-energy coils may be used, such as the GM HEI external coil, the Ford TFI coil, and many aftermarket equivalents. Ford models using the DuraSpark-I (California-only) include: *1977 Custom *1978-'79 Fairmont *1977-'79 Granada *1977-'79 LTD *1977-'79 LTD II *1977 Maverick *1979 Mustang *1977-'78 Mustang II *1977-'79 Thunderbird Lincoln and Mercury equivalent models are similarly equipped.
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