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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICS
1985 Jeep CJ-7 L6-258 4.2L VIN C 2-bbl
Component Tests and General Diagnostics
1985 Jeep CJ-7 L6-258 4.2L VIN C 2-bblSECTION Component Tests and General Diagnostics
The CEC system should be considered as a possible source of trouble for engine performance, fuel economy and exhaust emission problems only after performing normal tests which would apply to a vehicle without the CEC system.
On all engine except 4-150 and 1984-87 6-258, the following equipment is needed to perform the diagnostic tests: a tachometer, a hand vacuum pump, a digital volt/ohmmeter with a minimum ohms-per-volt input impedance of 10 meg-ohms and jumper wires.
On 4-150 and 1984-87 6-258 engines, an electrical fuel feedback system tester, tool No. ET-501, is available to aid in system diagnosis. In the event tool No. ET-501 is not available, the following equipment is needed to perform the diagnostic tests: tachometer, hand vacuum pump, standard volt-ohmmeter, dwell meter and an inspection stethoscope.
On all models, after completing a repair, ensure that the malfunction has been eliminated.
On all engine except 4-150 and 1984-87 6-258, the following equipment is needed to perform the diagnostic tests: a tachometer, a hand vacuum pump, a digital volt/ohmmeter with a minimum ohms-per-volt input impedance of 10 meg-ohms and jumper wires.
On 4-150 and 1984-87 6-258 engines, an electrical fuel feedback system tester, tool No. ET-501, is available to aid in system diagnosis. In the event tool No. ET-501 is not available, the following equipment is needed to perform the diagnostic tests: tachometer, hand vacuum pump, standard volt-ohmmeter, dwell meter and an inspection stethoscope.
On all models, after completing a repair, ensure that the malfunction has been eliminated.
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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.