Fuel Pressure High
WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 1992 Oldsmobile Bravada, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.
If fuel pressure is too high, air/fuel ratio will be rich. For fuel pressure checking procedure, see BASIC TESTING article. The ECM can compensate for slight increases but if air/fuel ratio becomes too rich a Code 45 will be set.
If fuel pressure is too high, air/fuel ratio will be rich. For fuel pressure checking procedure, see TESTS W/CODES - DIESEL (for Diesel engines) or TESTS W/CODES - V6 (for Gas engines) and the article TESTS W/CODES - TRANSMISSION (if transmission codes are displayed). The ECM can compensate for slight increases but if air/fuel ratio becomes too rich a Code 45 will be set.