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 MANUALSFORD1997EXPLORER 4D UTILITY, 4.0 E, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 6 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 5.0L)EMISSION SYSTEMS & SUBSYSTEMSPOSITIVE CRANKCASE VENTILATION (PCV)
1997 Ford Explorer 4D Utility, 4.0 E, 4WD
Positive Crankcase Ventilation (PCV)
1997 Ford Explorer 4D Utility, 4.0 E, 4WDSECTION Positive Crankcase Ventilation (PCV)
WARNING: This page is about a different variant/trim than selected.
- Check PCV Valve Remove PCV valve. Shake valve and listen for rattle. If PCV valve rattles when shaken, go to next step. Replace PCV valve if it does not rattle when shaken.
- Check PCV System Start engine and warm to normal operating temperature. Disconnect hose from remote air cleaner or outlet tube. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, go to next step. If vacuum from hose holds paper in place for one minute, PCV system is okay and testing is complete.
- Check Evaporative Emission System
Disconnect evaporative emission hose from PCV system and plug connector. Place a stiff piece of paper over end of hose. If vacuum from hose does not hold paper in place for one minute, isolate vacuum leak or restriction and repair as necessary. If vacuum from hose holds paper in place for one minute, proceed as follows:
- On models equipped with Fuel Tank Pressure (FTP) sensor, see step 47) of CIRCUIT TEST HX in TESTS W/CODES - 5.0L article.
- On models not equipped with Fuel Tank Pressure (FTP) sensor, go to step 10) of CIRCUIT TEST HW in TESTS W/CODES - 5.0L article.
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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.