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.
EGR Modulator
1991 Geo Tracker LSi, AutomaticSECTION EGR Modulator
- Remove EGR modulator. Plug one upper vacuum hose fitting while blowing air into remaining upper vacuum hose fitting. Air should pass through the filter.
- Connect vacuum pump to one of the upper vacuum hose fittings. Plug remaining upper vacuum hose fitting (exhaust gas pressure port). Blow air into the bottom vacuum hose fitting, while applying vacuum with vacuum pump. Vacuum should be obtained. Replace EGR modulator if defective.
RENDER: 1.0x
NO RELATED
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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.