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 MANUALSCHEVROLET1982FORWARD CONTROL 4.8L ENG VIN T, AUTOMATIC TRANS, TRANS MFR CD 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMDELCO-REMY HIGH ENERGY IGNITIONTESTINGELECTRONIC SPARK CONTROL (ESC) TESTINGDETONATION PROBLEMS
1982 Chevrolet Forward Control 4.8L Eng VIN T, Automatic Trans, Trans Mfr CD 475/M40
Detonation Problems
1982 Chevrolet Forward Control 4.8L Eng VIN T, Automatic Trans, Trans Mfr CD 475/M40SECTION Detonation Problems
- With engine running at fast idle speed and transmission in Neutral or Park, tap exhaust manifold lightly and repeatedly. Check for spark timing retard with a timing light. If retard is noted, check other engine detonation causes.
- If no retard occurs, disconnect 10-pin connector from ESC controller in passenger compartment. Connect ohmmeter leads between pins "B" and "K" of connector. Resistance should be 175-375 ohms. If so, proceed to step 4).
- If resistance reading was either high or low, disconnect detonation sensor wire. Measure resistance by connecting ohmmeter leads to sensor terminal and ground. Reading should be 175-375 ohms.
- If high or low, replace sensor. If OK, check wires from pins "A", "B", and "K" of 10-pin connector for opens or shorts. If OK, repair sensor connector. If not OK, replace or repair wiring harness.
- If resistance reading in step 2) was OK, try to start engine with 10-pin connector disconnected. If it starts, replace distributor's HEI module.
- If engine will not start, reconnect 10-pin connector to controller. Disconnect sensor wire from sensor, and insert a jumper wire into sensor wire connector. With engine running at fast idle speed, lay wire on top of distributor over ignition coil. If spark timing retard occurs, replace sensor.
- If no spark retard occurs, connect voltmeter positive lead to pin "H" of 10-pin connector and negative lead to pin "K". With ignition switch "ON", voltage should read more than 0.2 volt. If voltage is more than 0.2 volt, replace ESC controller. If less than 0.2 volt, repair open wire from pin "H" in ESC harness.
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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.