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.
1990 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE
EGR Valve Solenoid Test
- With engine at normal operating temperature, connect vacuum gauge to manifold vacuum. Vacuum gauge should read a minimum of 15 in. Hg. If vacuum is low, check hose for damage, kinks and proper connection. If vacuum is okay, proceed to next step.
- Disconnect vacuum line from transducer side of solenoid (output side) and connect vacuum gauge. If the reading is zero inches of vacuum, go to step 3) If reading is not to specification, check solenoid/ECU operation with Diagnostic Readout Box (DRB-II) and Jeep/Eagle adapter or similar scan tool, repair as necessary.
- If reading was zero inches of vacuum in step 2), disconnect electrical connector at EGR valve solenoid. Vacuum gauge should now show vacuum is present. If vacuum is not present, replace solenoid. Proceed to EGR VALVE test.
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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