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.
1989 Jeep WagoneerFACTORY OEM SERVICE PROCEDURE
EGR Valve System Test
- Start engine and verify that vacuum is present at vacuum fitting "C" (vacuum source) of EGR valve solenoid. See Fig 1 . Remove vacuum connector from fittings "A" and "B". Connect a vacuum gauge to vacuum fitting "B".
- Start and idle engine. There should be no vacuum at fitting "B". Disconnect electrical connector "D" from solenoid. There should now be vacuum at "B".
Factory Service Tools
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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.
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