Make sure this part fits

GM 1986905 Regulation, Vacuum

1988-1990 GM

Customer Questions & Expert Answers (3)
1986905 GM Regulation, Vacuum Product Photo 1 of 3
  • Part Description
    VALVE, Emission Control System
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number1986905
    Part DescriptionVALVE, Emission Control System
    Item Dimensions3.2 x 2.1 x 2.1 inches
    Item Weight0.30 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU1986905
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    1988-1990 Cadillac Deville8 Cyl 4.5L2 DOOR, 4 DOOR, 60 SPECIAL 4 DOOR, CONVERSION, FUNERAL COACH, LIMOUSINE 4 DOOR
    1988-1989 Cadillac Eldorado8 Cyl 4.5LCOMMERCIAL CHASSIS, ELDORADO
    1988-1990 Cadillac Fleetwood8 Cyl 4.5L2 DOOR, 4 DOOR, 60 SPECIAL 4 DOOR, CONVERSION, FUNERAL COACH, LIMOUSINE 4 DOOR
    1988-1989 Cadillac Seville8 Cyl 4.5LSEVILLE
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 1986905 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What is the purpose of the EGR Valve in the Exhaust Gas Recirculation (EGR) system of the 1990 Cadillac Fleetwood's engine? Posted by Ronn O.
    A:
    The purpose of the EGR system is to reduce the emission levels of oxides of nitrogen (NOx), which can have harmful environmental effects. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jeremy / Jul 12, 2026
    Q:
    How does the EGR Valve system work for the 1989 Cadillac ElDorado? Posted by Niles D.
    A:
    The EGR system works by diluting the incoming air/fuel charge with exhaust gas, which lowers the combustion temperature and reduces the formation of NOx. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Julian / Jan 15, 2024

Genuine GM Part 1986905, the Right Choice

To ensure reliability, purchase GM part # 1986905 Regulation, Vacuum. It is sometimes referred to as GM EGR Filter, GM EGR Valve. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Cadillac Deville, Fleetwood, Seville models.

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