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 MANUALSCHEVROLET1987R 30 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION COILTESTING AND INSPECTION
1987 Chevrolet R 30 P/U 2WD V8-350 5.7L
Ignition Coil: Testing and Inspection
1987 Chevrolet R 30 P/U 2WD V8-350 5.7LSECTION Testing and Inspection
Tester J-24624 is required to test the module. If this tester is not available, and malfunction still exists after performing the following checks, replace module.
Fig. 3 Ignition coil test connections:
IGNITION COIL TEST
1. Connect ohmmeter as shown in step 1, Fig. 3, and set meter on high scale. Meter should indicate very high or infinite resistance. If not, coil is defective.
2. Connect ohmmeter as shown in step 2, Fig. 3, and set meter on low scale. Meter should indicate low or no resistance. If not, coil is defective.
3. Connect ohmmeter as shown in step 3, Fig. 3, and set meter on high scale. If meter indicates infinite resistance, coil is defective.
Fig. 4 Pickup coil test connections:
PICKUP COIL TEST
1. Remove distributor cap and rotor, and disconnect pickup coil leads from module.
2. Connect ohmmeter as shown in step 1, Fig. 4, and flex pickup coil leads while observing meter. Meter should indicate infinite resistance at all times. If not, pickup coil is defective.
3. Connect ohmmeter as shown in step 2, Fig. 4, and flex pickup coil leads while observing meter. Meter reading should remain constant between 500 and 1500 ohms. If not, replace pickup coil.
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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.