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 MANUALSFORD1994AEROSTAR AWD V6-245 4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSPOSITIVE CRANKCASE VENTILATIONTESTING AND INSPECTIONPCV 3 - EVAPORATIVE EMISSION SYSTEM CHECK
1994 Ford Aerostar AWD V6-245 4.0L
PCV 3 - Evaporative Emission System Check
1994 Ford Aerostar AWD V6-245 4.0LSECTION PCV 3 - Evaporative Emission System Check
NOTE: If the evaporative hose is not connected to the PCV system, follow the "No" Action To Take in this test step.
^ Disconnect evaporative hose at connection to PCV hose (if equipped). Cap the connector and retest.
^ Place a stiff piece of paper over the hose/nipple, as in PCV2. Wait one minute.
^ Does vacuum hold the paper in place?
YES -- Go to evaporative emission systems. Symptom Related Diagnostic Procedures
NO -- Check for vacuum leaks/obstruction in the system (ex. oil cap PCV valve, hoses, cut grommets, oil separator). Service as necessary.
^ Disconnect evaporative hose at connection to PCV hose (if equipped). Cap the connector and retest.
^ Place a stiff piece of paper over the hose/nipple, as in PCV2. Wait one minute.
^ Does vacuum hold the paper in place?
YES -- Go to evaporative emission systems. Symptom Related Diagnostic Procedures
NO -- Check for vacuum leaks/obstruction in the system (ex. oil cap PCV valve, hoses, cut grommets, oil separator). Service as necessary.
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.