What engine does this vacuum diagram cover?

The decal is marked 5.8L with the emissions system designation RDX/AIR/HO2S/EGR/MPI and calibration code MFM05.8BSA6.

What components are shown in the vacuum routing?

DIV/ASV air diverter valves, AIR BPV (air bypass valve), FPP, PCV, carbon canister with CPRV, throttle body, EGR, MAP sensor, manifold vacuum taps, two vacuum reservoirs (VRESER), EVR, and two solenoid valves (SOL V) for TAD and TAB.

What oil does the decal recommend?

The decal states 'USE SAE 10W-30 OIL' (remainder of the line is cut off in the photo).

Does this diagram show dual fuel tanks?

Yes, the diagram labels 'FUEL TANKS' (plural) connected via dashed lines to the carbon canister and canister purge valve (CPRV).

Are there ignition timing adjustment steps on the decal?

Yes, a numbered 5-step procedure is visible: (1) turn off engine, (2) disconnect, (3) re-start, (4) adjust ignition, (5) turn off engine, though the right side of each line is cut off in the photo.

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Ford 5.8L Vacuum Hose Routing Diagram - Emissions Decal MFM05.8BSA6

Photo of underhood Ford vacuum hose routing emissions decal with color-coded hose schematic

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Photo of an underhood Ford vacuum hose routing emissions decal showing the color-coded vacuum schematic and tune-up instructions.

AI caption February 2015 · Photo 55 of 89

This document is a photograph of a Ford underhood vacuum hose routing / emissions decal for a 5.8L engine with multi-port fuel injection (labeled "5.8L RDX/AIR/HO2S/EGR/MPI" with calibration code MFM05.8BSA6). The diagram shows color-coded vacuum hose routing among emissions and engine control components including: two air diverter valves (DIV/ASV), an air bypass valve (AIR BPV), fuel tanks connected to a carbon canister and canister purge valve (CPRV), the throttle body, EGR valve, MAP sensor, PCV valve, fuel pressure regulator (FPP), multiple manifold vacuum (MAN VAC) taps, two vacuum reservoirs (VRESER), an EGR vacuum regulator (EVR), and two solenoid valves (SOL V) controlling TAD and TAB functions. The right-hand text panel is partially cut off by the photo edge, but contains instructions about idle mixtures, ignition timing adjustment with the brake set at operating temperature, a five-step procedure (turn off engine, disconnect, re-start, adjust ignition, turn off engine), and a recommendation to use SAE 10W-30 oil. This decal is useful for restoring correct vacuum hose routing on a 5.8L (351W) Ford truck with dual fuel tanks and Thermactor air injection.

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Frequently asked questions

What engine does this vacuum diagram cover?: The decal is marked 5.8L with the emissions system designation RDX/AIR/HO2S/EGR/MPI and calibration code MFM05.8BSA6.
What components are shown in the vacuum routing?: DIV/ASV air diverter valves, AIR BPV (air bypass valve), FPP, PCV, carbon canister with CPRV, throttle body, EGR, MAP sensor, manifold vacuum taps, two vacuum reservoirs (VRESER), EVR, and two solenoid valves (SOL V) for TAD and TAB.
What oil does the decal recommend?: The decal states 'USE SAE 10W-30 OIL' (remainder of the line is cut off in the photo).
Does this diagram show dual fuel tanks?: Yes, the diagram labels 'FUEL TANKS' (plural) connected via dashed lines to the carbon canister and canister purge valve (CPRV).
Are there ignition timing adjustment steps on the decal?: Yes, a numbered 5-step procedure is visible: (1) turn off engine, (2) disconnect, (3) re-start, (4) adjust ignition, (5) turn off engine, though the right side of each line is cut off in the photo.