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 MANUALSFORD1985E 150 VAN L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSAIR INJECTIONTESTING AND INSPECTIONSECONDARY AIR INJECTION SYSTEMIDLE DUMP DELAY VALVE
1985 Ford E 150 Van L6-300 4.9L
Idle Dump Delay Valve
1985 Ford E 150 Van L6-300 4.9LSECTION Idle Dump Delay Valve
NORMALLY CLOSED (TYPE 1) SOLENOID VACUUM VALVE
A type 1 solenoid vacuum valve is used in conjunction with a type 1 air cleaner temperature switch.
1. Start engine and allow to reach normal operating temperature. Make sure that ambient air around air cleaner is above 65° F.
2. With engine idling, disconnect vacuum hose to thermactor air bypass valve. Thermactor air should exhaust in atmosphere through exhaust ports in end of valve silencer cover. Reconnect vacuum hose. Vacuum supply hose must always be connected to bottom vacuum fitting on solenoid vacuum valve.
3. Disconnect vacuum supply hose at solenoid valve, and check for vacuum by placing finger over end of hose. There should be vacuum with engine idling. If not, check vacuum hose and vacuum source for leaks or obstructions.
4. Disconnect solenoid vacuum valve wiring connector and determine which terminal has 12 volts with ignition in the run position. Use a test light; connect one end to terminal and other end to ground.
5. Connect wire with 12 volts battery voltage to solenoid vacuum valve. With engine idling, ground other exposed terminal on solenoid vacuum valve to chassis ground. Thermactor air should not be dumped.
6. Reconnect wire disconnected in step 4 to solenoid vacuum valve. Thermactor air should not be dumped.
7. Replace solenoid vacuum valve if operation is not as specified in steps 5 and 6.
NORMALLY OPEN (TYPE 2) SOLENOID VACUUM VALVE
A type 2 solenoid vacuum valve is used in conjunction with a type 2 air cleaner temperature switch.
1. Start engine and allow to reach normal operating temperature. Make sure that ambient air around air cleaner is above 65° F.
2. With engine idling, disconnect vacuum hose to thermactor air bypass valve. Thermactor air should exhaust to atmosphere through exhaust ports in end of valve silencer cover. Reconnect vacuum hose. Vacuum hose must be connected to black input nozzle on solenoid valve.
3. Disconnect wiring to solenoid valve and determine which wire has 12 volts when ignition switch is in the run position. Use a test light; connect one end to wire and other end to ground.
4. Connect wire power supply wire to solenoid vacuum valve, then with engine at normal idle, ground other exposed terminal on solenoid vacuum valve to ground. Thermactor air should be exhausted to atmosphere.
5. Reconnect other wire to solenoid vacuum valve. Thermactor air should not be dumped to atmosphere.
6. Replace solenoid vacuum valve if operation is not as specified in steps 4 and 5.
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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.