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 & SUBSYSTEMSSECONDARY AIR INJECTION
1997 Ford Explorer 4D Utility, 4.0 E, 4WD
Secondary Air Injection
1997 Ford Explorer 4D Utility, 4.0 E, 4WDSECTION Secondary Air Injection
WARNING: This page is about a different variant/trim than selected.
Faults in idle control system or circuit should set a Diagnostic Trouble Code (DTC). See QUICK TEST in TESTS W/CODES - 5.0L article. If DTC has not been set:
- On models equipped with Electronic Air Injection System (EAIR), go to step 1) of CIRCUIT TEST HM in TESTS W/CODES - 5.0L article.
- On models equipped with mechanical secondary air injection system (EAIR), go to step 40) of CIRCUIT TEST HM in TESTS W/CODES - 5.0L article.
RENDER: 1.0x
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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.