Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSFUEL EVAPORATION VALVE
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Fuel Evaporation Valve
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Fuel Evaporation Valve
Check electrical function:
[D] 300 - The fuel evaporation valve is driven at intervals of one second. The actuation cycles can be felt with the hand.
Check for leaks:
Release hoses from valve, switch on vacuum pump at service tester and connect to valve (8 mm connection) (note arrow indicating direction of flow). Set vacuum to 600 mbar and apply a voltage of 12 V to the valve. Switch off vacuum pump, after 20 sec, the pressure drop must not exceed 50 mbar.
When power is not applied, the fuel evaporation valve is dosed by a non - return valve to a vacuum of 20 mbar.
Check drive phases:
[D] 100 - The valve is driven at idle speed (display: ON or CLOSED) and is therefore closed. As soon as the oxygen control is active and the engine speed is increased, the valve can be observed to open step-by-step (display: OFF or OPEN).
After switching oft the engine, the valve is held closed for 3...5 sec.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.