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 MANUALSISUZU1985I-MARK 2D HATCHBACK, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR FUNCTION TESTING - DIESELCOMPONENT TESTINGEGR VALVE
1985 Isuzu I-Mark 2D Hatchback, Standard
EGR Valve
1985 Isuzu I-Mark 2D Hatchback, StandardSECTION EGR Valve
- Detach vacuum hose from EGR valve and connect outside vacuum source, such as hand pump with gauge. Apply vacuum, EGR valve should not leak down.
- While applying vacuum, watch movement of valve stem. At 13.8 in. Hg (I-Mark), stem should move diaphragm to full up position. If valve does not respond as indicated, replace EGR valve.
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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.