One of the most important parts of the Audi Fox emission control system is the air pump. This often-overlooked component works to maintain your vintage Audi's emissions compliance , by injecting fresh air into the exhaust stream, it promotes more complete oxidation of unburned hydrocarbons and carbon monoxide. Though small in size, the contribution this air pump makes to emissions performance and overall engine efficiency is significant. It represents 1970s automotive engineering for emissions compliance under the Clean Air Act.
For an Audi Fox enthusiast or restorer, maintaining the air pump in proper working condition is essential. It may be a small part, yet it does an important job to help the classic Audi Fox run properly in compliance with original emissions design. Not only will it help your Fox pass emission testing (where required), but it ensures the engine operates as originally designed.
The Audi Fox air pump is an integral component of the vehicle's secondary air injection system. This compact yet effective device is designed to inject additional oxygen into the exhaust stream, particularly during cold start when the engine is most likely to produce higher emissions.
The pump forces filtered atmospheric air into the exhaust manifold, ensuring that excess fuel and carbon monoxide are oxidized into less harmful compounds before they leave the tailpipe. This not only reduces emissions but also helps the engine reach proper operating conditions faster.
Operation of the pump is generally controlled by the engine and emissions system, which engages the pump whenever prevailing conditions demand additional treatment of the exhaust. Proper maintenance of this component ensures that the Fox runs within emission standards and that the overall health of the engine is maintained for smooth, long-lasting performance.
The Audi Fox is a significant part of Audi's US market history:
| Vehicle | Compatibility |
|---|---|
| Audi Fox (B1 chassis) | 1973-1978 US market with factory emissions system , the primary application |
| Audi 80 (B1 chassis, European) | 1972-1978 with secondary air injection system |
| Audi Fox Wagon | Estate/wagon variant of the same chassis |
| Related (Different Chassis) | Audi 4000 B2 (1980-1987) , see our Audi 4000 Quattro A/C Compressor listing; Audi 80/90 B3 (1986-1991) , see our Audi 80 Series A/C Condenser listing |
| Verification | Verify specific year and US/European market variant |
| Part Type | Secondary Air Injection Pump (smog pump) |
|---|---|
| Vehicle Application | Audi Fox B1 chassis 1973-1978 (US market name for Audi 80 B1) |
| Material | Metal or high-durability plastics |
| Drive Type | Belt-driven mechanical pump |
| Drive Mechanism | Belt connected to the engine's crankshaft |
| Function | Emission control by introducing fresh air into the exhaust system |
| Cold Start Assistance | Enhances emissions control during cold starts |
| Check Valve | Included to prevent exhaust gas backflow |
| Clean Air Act Context | Part of mandated emissions controls (1970s) |
| Engine | 1.5L inline-4 (ZA engine code) |
| Price | $149.00 |
Contact (240) 301-0095 within 15 days.
