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 MANUALSCHEVROLET1986CAPRICE WAGON V6-262 4.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRENGINE CONTROL MODULE (ECM) REPLACEMENT
1986 Chevrolet Caprice Wagon V6-262 4.3L
Engine Control Module (ECM) Replacement
1986 Chevrolet Caprice Wagon V6-262 4.3LSECTION Engine Control Module (ECM) Replacement
1. Disconnect battery ground cable.
2. Disconnect two ECM electrical connectors.
3. Remove the ECM mounting hardware.
4. Remove ECM from passenger compartment.
5. Reverse procedure to install.
Replacement ECM is supplied without engine calibration unit (PROM) and, on 1984-85 models equipped with 4-121 overhead valve engine, 1985-86 models equipped with V6 engine and 1986-87 models equipped with 4-121 overhead valve engine and auto. trans., the CALPAK. 1986-87 models equipped with 4-121 overhead valve engine and man. trans. are equipped with a MEM-CAL in place of the PROM. Care must be taken when removing the PROM, CALPAK or MEM-CAL from a defective ECM as they will be used in the replacement ECM.
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.