STANDARD MOTOR PRODUCTS Daily Driver Auxiliary Air / Intake Change Over Valve — direct fit for Ford Expedition 4.6L V8 (1998-2000). Genuine quality replacement built to OEM tolerances, ships to all 50 USA states from RevXSC.
Engineered by STANDARD MOTOR PRODUCTS as a daily driver grade auxiliary air / intake change over valve for the 4.6L V8 engine, this AC158 matches factory mounting points and form factor so install requires no modification. Direct OEM-style replacement. Standard replacement spec — the same dimensions, materials and performance envelope as the original factory part.
Search by any number below — they all match STANDARD MOTOR PRODUCTS AC158:
| Year | Make / Model | Engine | Notes |
|---|---|---|---|
| 1998 | Ford Expedition | 4.6L V8 | Auxiliary Air / Intake Change Over Valve |
| 1999 | Ford Expedition | 4.6L V8 | Auxiliary Air / Intake Change Over Valve |
| 2000 | Ford Expedition | 4.6L V8 | Auxiliary Air / Intake Change Over Valve |
Always replace auxiliary air / intake change over valve components in matched sets where applicable, torque fasteners to factory spec, and inspect adjacent exhaust & emission components for wear during installation. If you're not sure which variant matches your VIN, send us the last 8 digits of the VIN before checkout and we will confirm fitment.
Is AC158 a direct replacement?
Yes — STANDARD MOTOR PRODUCTS AC158 is built to OEM form/fit/function for the Ford Expedition 4.6L V8 (1998-2000).
Do you ship to my state?
We ship to all 50 USA states. Tracking is provided.
What's the difference between Economy, Standard Replacement and Heavy Duty?
Economy is the value-priced option for everyday driving; Standard Replacement matches OEM spec; Heavy Duty uses upgraded materials for towing, fleet and severe service.
How can I confirm fitment?
Match year, make, model and engine (1998-2000 Ford Expedition 4.6L V8). When in doubt, send your VIN — we verify before dispatch.
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Note: The product image is for illustrative purposes only. Actual product may vary slightly in appearance, packaging, or labeling. Fitment and specifications are guaranteed to OEM standards.