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.
1988 Jeep Comanche Eliminator, AutomaticFACTORY OEM SERVICE PROCEDURE
Knock Sensor Test
- Start engine until engine reaches normal operating temperature. Connect Diagnostic Tester (M.S. 1700). Observe knock value on tester. Using tip of screw driver, gently tap on cylinder block next to knock sensor and observe knock sensor value on tester.
- Knock sensor value should increase while tapping on cylinder block. If knock sensor value does not increase while tapping on cylinder block, check knock sensor for proper connection. If connection is good, replace knock sensor.
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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