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 MANUALSFORD1991PROBE V6-182 3.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEVAPORATIVE EMISSIONS SYSTEMTESTING AND INSPECTION
1991 Ford Probe V6-182 3.0L
Evaporative Emissions System: Testing and Inspection
1991 Ford Probe V6-182 3.0LSECTION Testing and Inspection
TANK VENTILATION INSPECTION
1. Check for broken seals at the filler cap, filler neck, the tank vapor vent valve, and between hose/tubing connections. Make repairs as necessary.
2. Check the vacuum and vapor hoses for kinks, cuts, cracks, and blockage. Make repairs as necessary.
3. Connect a hand vacuum pump to the fuel tank vapor vent line at the canister.
4. Apply 2.5 inches of vacuum.
CAUTION: DO NOT apply any more than 2.5" vacuum. Vacuum should hold. If not, inspect hoses for leakage points.
5. Open the fuel tank filler cap.
Applied vacuum at the pump should drop to 0 immediately. If not, inspect hoses for blockage.
PURGE SOLENOID TEST
1. Disconnect the electrical connector at the canister purge solenoid.
2. Connect a vacuum pump to the source vacuum nipple of the solenoid, and apply 5" vacuum.
Vacuum should NOT leak. If it does, replace the solenoid.
3. Connect jumper wires to the electrical terminals of the solenoid.
4. While applying vacuum to the source vacuum nipple, energize the solenoid by connecting jumper wires from a 12 volt battery to the electrical terminals of the solenoid.
The valve should open, allowing vacuum to pass through. If it does not, replace the solenoid.
Testing Fuel Tank Ventilation System:
1. Check for broken seals at the filler cap, filler neck, the tank vapor vent valve, and between hose/tubing connections. Make repairs as necessary.
2. Check the vacuum and vapor hoses for kinks, cuts, cracks, and blockage. Make repairs as necessary.
3. Connect a hand vacuum pump to the fuel tank vapor vent line at the canister.
4. Apply 2.5 inches of vacuum.
CAUTION: DO NOT apply any more than 2.5" vacuum. Vacuum should hold. If not, inspect hoses for leakage points.
5. Open the fuel tank filler cap.
Applied vacuum at the pump should drop to 0 immediately. If not, inspect hoses for blockage.
PURGE SOLENOID TEST
Testing The Purge Solenoid:
1. Disconnect the electrical connector at the canister purge solenoid.
2. Connect a vacuum pump to the source vacuum nipple of the solenoid, and apply 5" vacuum.
Vacuum should NOT leak. If it does, replace the solenoid.
3. Connect jumper wires to the electrical terminals of the solenoid.
4. While applying vacuum to the source vacuum nipple, energize the solenoid by connecting jumper wires from a 12 volt battery to the electrical terminals of the solenoid.
The valve should open, allowing vacuum to pass through. If it does not, replace the solenoid.
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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.