Genuine Motorcraft DY-258 Spark Delay Valve (NOS)
Restore factory-correct emissions performance and smooth timing advance in your classic 1979-1980 Ford or Mercury with this genuine Motorcraft DY-258 Spark Delay Valve. This authentic New Old Stock (NOS) distributor vacuum control valve, identified by Ford engineering number D9TE-CA, is designed to regulate the vacuum signal to vehicles equipped with DuraSpark II ignition systems. Specifically engineered for use on Ford F-150, F-250, and F-350 pickups, the full-size Bronco, and passenger cars like the Fairmont, Granada, and Thunderbird, this valve slows the vacuum signal during quick acceleration to manage spark timing for optimal emissions control. Manufactured in the USA to original equipment standards, this vintage component is essential for maintaining the performance and factory accuracy of your late 1970s restoration project.
Key Features:
- Brand: Motorcraft
- Part Number: DY-258
- OEM Number: D9TE-CA
- Interchange: Distributor Vacuum Control Valve, D9TECA
- Position: Distributor Vacuum Line (Inline)
- Engine Fitment: V8 (255, 302, 351W, 400) and I6 Models
- Origin: Made in USA
- Condition: New Old Stock (NOS)
Verified Vehicle Fitment:
| Make |
Model |
Year |
Engine |
Notes |
| Ford |
F-150 / F-250 / F-350 (F-Series) |
1979-1980 |
V8 & I6 |
Inline with Distributor Vacuum Line |
| Ford |
Bronco (Full Size) |
1979-1980 |
V8 & I6 |
DuraSpark II Systems |
| Ford |
Fairmont / Granada / LTD / Thunderbird |
1979-1980 |
4.2L / 5.0L / 5.8L |
V8 & I6 Models |
| Mercury |
Cougar / Marquis / Zephyr |
1979-1980 |
V8 & I6 |
Distributor Vacuum Control |
Fits Years:
1979 1980
Note on Stock Photos: Due to our inventory of multiple identical units for this specific part number, we utilize representative stock photos for this listing. You will receive a component that strictly meets all listed specifications and fitment requirements. Please be aware that because these are vintage parts, minor cosmetic variations—such as surface finish, color, or production markings—may exist between different manufacturing runs. These slight aesthetic differences are a result of historical production processes and do not impact the part's integrity, performance, or authenticity.
A Note on Fitment Accuracy: We manually research and cross-reference our fitment data using vintage manufacturer catalogs. While we strive for 100% accuracy, these decades-old resources—and the humans reading them—can occasionally contain errors. Additionally, these parts may fit other vehicles and years not explicitly listed in our data. To ensure a seamless restoration, we kindly ask that you perform your own due diligence and verify that this specific part number is correct for your application prior to purchase.
Unbeatable Prices & Expectations
While many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Some original boxes may show signs of shelf-wear, such as dust, tape, or surface distress from years of storage. Rest assured, the components inside have been inspected to ensure they are complete and ready to help you finish your project without breaking the bank.
