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 MANUALSJEEP1985CJ-7 L6-258 4.2L VIN C 2-BBLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONSERVICE AND REPAIR
1985 Jeep CJ-7 L6-258 4.2L VIN C 2-bbl
Exhaust Gas Recirculation: Service and Repair
1985 Jeep CJ-7 L6-258 4.2L VIN C 2-bblSECTION Service and Repair
EGR VALVE, REPLACE
1. On four and eight cylinder engines, remove air cleaner assembly.
2. Disconnect vacuum lines from valve, then remove valve retaining screws and the valve.
3. Clean EGR pintle and gasket mating surfaces.
4. Reverse procedure to install.
VACUUM DUMP VALVE, REPLACE
1. Disconnect vacuum lines from valve and remove the valve.
2. Reverse procedure to install, ensuring that manifold vacuum line is connected to port A and EGR valve vacuum line is connected to port B.
TVS, REPLACE
1. Remove air cleaner and filter.
2. Remove TVS retaining clips and disconnect vacuum lines, then remove the TVS.
3. Reverse procedure to install.
CTO SWITCH, REPLACE
1. Drain coolant from radiator.
2. On V8 engines, remove air cleaner assembly. On V8 engines, it may be necessary to remove the ignition coil bracket attaching screw and move the coil away from the CTO switch.
3. Disconnect vacuum lines from valve and remove the valve.
4. Reverse procedure to install.
RENDER: 1.0x
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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.