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1991 Ford F-150

1991 Ford F-150 Air Inject Check Valves

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Standard OE Replacement Air Inject Check Valve - Direct Fit, Sold individually
Part Number: SIAV23
Guaranteed to Fit
$33.49
Vehicle Fitment
  • 1991 Ford F-150 Custom 8 Cyl 5.0L Hose Nipple One End
  • 1991 Ford F-150 XLT Lariat 8 Cyl 5.0L Hose Nipple One End
  • 1991 Ford F-150 XL 8 Cyl 5.0L Hose Nipple One End
Product Details
Notes : 0.75 in. hose sizeWarranty : 3-year or 36,000-mile Standard limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Standard OE ReplacementProduct Fit : Direct Fit
Standard OE Replacement Air Inject Check Valve - Direct Fit, Sold individually
Part Number: SIAV30
Guaranteed to Fit
$69.49
Vehicle Fitment
  • 1991 Ford F-150 Custom 8 Cyl 5.8L Without External Thread
  • 1991 Ford F-150 XL 8 Cyl 5.8L Without External Thread
  • 1991 Ford F-150 XLT Lariat 8 Cyl 5.8L Without External Thread
Product Details
Warranty : 3-year or 36,000-mile Standard limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Standard OE ReplacementProduct Fit : Direct Fit
Standard OE Replacement Air Inject Check Valve - Direct Fit, Sold individually
Part Number: SIAV1
Guaranteed to Fit
$17.99
Vehicle Fitment
  • 1991 Ford F-150 XL 8 Cyl 5.8L Without Tube, With External Thread
  • 1991 Ford F-150 Custom 8 Cyl 5.8L Without Tube, With External Thread
  • 1991 Ford F-150 XLT Lariat 8 Cyl 5.8L Without Tube, With External Thread
Product Details
Notes : 1.24 in. hose sizeWarranty : 3-year or 36,000-mile Standard limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Standard OE ReplacementProduct Fit : Direct Fit
Standard OE Replacement Air Inject Check Valve - Direct Fit, Sold individually
Part Number: SIAV12
Guaranteed to Fit
$51.49
Vehicle Fitment
  • 1991 Ford F-150 Custom 8 Cyl 5.0L
  • 1991 Ford F-150 XLT Lariat 8 Cyl 5.0L
  • 1991 Ford F-150 XL 8 Cyl 5.0L
Product Details
Notes : 1.24 in. hose size; 1/2 in.-14 thread sizeWarranty : 3-year or 36,000-mile Standard limited warrantyQuantity Sold : Sold individuallyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Standard OE ReplacementProduct Fit : Direct Fit
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Helpful Automotive Resources

Symptoms of a Bad Air Injection Check Valve
Symptoms of a Bad Air Injection Check ValveCommon symptoms of a bad AIR check valve include: Illuminated Check Engine Light
Emission Control Systems
Emission Control SystemsThe purpose of the exhaust gas recirculation valve (EGR) valve is to meter a small amount of exhaust gas into the intake system, this dilutes the air/fuel mixture so as to lower the combustion chamber temperature. Excessive combustion chamber temperature creates oxides of nitrogen, which is a major pollutant. While