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 MANUALSCHEVROLET1986CAVALIER RS, 2D HATCHBACK, 2.8 W, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMV6/V8 PFI TESTS W/CODESDIAGNOSTIC CHARTSCHART C5 - ELECTRONIC SPARK CONTROL (ESC) (5.0/ 5.7L)
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, Automatic
Chart C5 - Electronic Spark Control (ESC) (5.0/ 5.7L)
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, AutomaticSECTION Chart C5 - Electronic Spark Control (ESC) (5.0/ 5.7L)
NOTE:
The following step numbers refer to the numbers on the Diagnostic Flow Charts.
- Tests ESC to see if it can detect a knock and retard the timing.
- By disconnecting the ESC module, the ECM sees low voltage at terminal "B7" and should retard timing. After approximately 4 seconds, "SERVICE ENGINE SOON" light will come on and code 43 will be stored.
- This test checks for proper voltage output (measured on AC scale) of knock sensor. Low or no voltage would indicate an open circuit to terminal "E" or faulty sensor.
- Checks to see if constant retard is due to a faulty knock sensor or module, or if a false voltage signal is being transmitted on the wire from the knock sensor by induction from an adjacent wire, suck as a spark plug wire, ignition wire, etc. Reroute wires.
- This checks to see if knock sensor is reason for retard signal. If engine knock is not present and timing increases when knock sensor is disconnected, fault is an over sensitive knock sensor. Timing should not normally increase.
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.