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 PERFORMANCESYSTEMFUEL INJECTION SYSTEM - PFIADJUSTMENTSMINIMUM IDLE SPEED ADJUSTMENT5.0L & 5.7L
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, Automatic
5.0L & 5.7L
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, AutomaticSECTION 5.0L & 5.7L
- Pierce the idle stop screw plug with an awl, and remove plug. With IAC motor connected, ground diagnostic lead.
- Turn ignition on, but do not start engine. Wait at least 30 seconds. Disconnect IAC electrical connector. Disconnect the distributor set-timing connector. Start engine and allow to go to closed loop.
- Remove ground from diagnostic connector. Adjust idle stop screw to 400 RPM in drive on automatic transmission and to 450 RPM in neutral with manual transmission. Turn ignition off and reconnect connector at IAC motor.
- Adjust TPS to .62 volt. See THROTTLE POSITION SENSOR ADJUSTMENT in this article.
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.