STP1005

    Effects of an Unstable Diesel Fuel on Injector Coking and Vehicle Performance

    Published: Jan 1988


      Format Pages Price  
    PDF Version (396K) 19 $25   ADD TO CART
    Complete Source PDF (4.9M) 19 $55   ADD TO CART


    Abstract

    The short-term effects of an oxidatively unstable diesel fuel were investigated in a 1982 General Motors 4.3-L V-6 diesel vehicle in city-suburban service. Effects on injector coking, Federal Test Procedure (FTP) emissions, fuel economy, cold-idle passenger compartment sound pressure, and driveability were monitored. The unstable test fuel caused frequent severe vehicle fuel filter plugging, despite the fuel having been pre-filtered with a filter having a pore size half that of the vehicle fuel filter. Filter plugging caused by fuel gum resulted in excessive smoke emission and power loss in highway operation and a tendency for the engine to stall easily when cold. It was concluded that vehicle fuel filter plugging can cause some of the complaints (for example, poor driveability and excessive smoke) attributed to injector coking. Injector coking was also observed, but the extent was insufficient to cause adverse effects on the measured parameters.

    Keywords:

    diesel fuels, injector coking, unstable diesel fuels, diesel emissions, cold idle noise, fuel filter plugging, fuel gum, driveability


    Author Information:

    Halsall, R
    Project scientist, General Motors Research Laboratories, Warren, MI


    Paper ID: STP10042S

    Committee/Subcommittee: D02.E0

    DOI: 10.1520/STP10042S


    CrossRef ASTM International is a member of CrossRef.