What is the ignition timing spec on this 1991 Ford 5.8L emissions label?

14° BTDC at 600 RPM maximum, with the distributor vacuum hose disconnected and plugged and a jumper installed across the two-wire ignition module connector, trans in Park. Reconnect the hose afterward.

What spark plug and gap does the label call for?

Spark plug ASF-42 with a gap of .042–.046.

What is the curb idle setting and how is it adjusted?

700 RPM with trans in Drive and all accessories off. First disconnect and plug the VOTM vacuum hose and set 700 RPM with the throttle stop screw, then connect manifold vacuum to the VOTM and set 700 RPM with the VOTM bracket adjusting screw, then reconnect the hose.

What is the fast idle specification?

1650 RPM with trans in Park (1500 RPM for vehicles with less than 100 miles), with the EGR hose disconnected and plugged, using the fast idle screw on the fast idle cam.

What engine oil does the label specify?

SAE 10W-30, API Service SG - Energy Conserving II.

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1991 Ford 5.8L Emission Control Label & Vacuum Hose Routing - Crown Victoria

Ford vehicle emission control information label with vacuum hose routing diagram

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Ford Vehicle Emission Control Information underhood label including a vacuum hose routing diagram for a 1991 model.

AI caption June 2003 · Photo 53 of 4215

This is a photograph of the factory Ford Motor Company Vehicle Emission Control Information (VECI) decal affixed to the underside of the hood (visible near the cooling fan shroud area). The label applies to a 5.8L carbureted engine (engine family MFM5.8V2HJF7, calibration/label code 5.8L-9EG) equipped with electronic carburetor controls (MCU/FB feedback system) and emission hardware AIP/EGR/EGS/OC/TWC, and it states the vehicle conforms to U.S. EPA regulations for the 1991 model year. The left portion gives tune-up procedures: ignition timing set to 14° BTDC at 600 RPM max with the distributor vacuum hose plugged and ignition module jumpered; fast idle 1650 RPM in Park (1500 RPM under 100 miles); curb idle 700 RPM in Drive using the throttle stop screw and VOTM bracket adjusting screw; and accelerator pump lever lash pre-load set to .010 ± .005 gap then one turn counterclockwise. It specifies spark plug ASF-42 gapped at .042–.046 and SAE 10W-30 API SG Energy Conserving II oil. The right side shows the color-coded vacuum hose routing diagram with components including the ACV, upstream/downstream air, solenoid valves, carburetor, manifold vacuum, fuel tank line, TVV, and VCV, oriented with 'Front of Vehicle' marked.

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Frequently asked questions

What is the ignition timing spec on this 1991 Ford 5.8L emissions label?: 14° BTDC at 600 RPM maximum, with the distributor vacuum hose disconnected and plugged and a jumper installed across the two-wire ignition module connector, trans in Park. Reconnect the hose afterward.
What spark plug and gap does the label call for?: Spark plug ASF-42 with a gap of .042–.046.
What is the curb idle setting and how is it adjusted?: 700 RPM with trans in Drive and all accessories off. First disconnect and plug the VOTM vacuum hose and set 700 RPM with the throttle stop screw, then connect manifold vacuum to the VOTM and set 700 RPM with the VOTM bracket adjusting screw, then reconnect the hose.
What is the fast idle specification?: 1650 RPM with trans in Park (1500 RPM for vehicles with less than 100 miles), with the EGR hose disconnected and plugged, using the fast idle screw on the fast idle cam.
What engine oil does the label specify?: SAE 10W-30, API Service SG - Energy Conserving II.