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.
2.8L (Except Fiero), 3.0L & 3.8L
1987 Pontiac 6000 STESECTION 2.8L (Except Fiero), 3.0L & 3.8L
- With IAC motor connected, ground diagnostic test lead. Turn ignition on, but do not start engine. Wait at least 30 seconds.
- With ignition on, disconnect IAC electrical connector. Remove ground from diagnostic lead and start engine. Pierce idle stop screw plug with an awl, and remove plug.
- Adjust minimum idle speed screw to obtain an idle speed of 550 RPM on models equipped with 2.8L automatic transmission (in Drive) and 650 RPM on models equipped with 2.8L manual transmission. Adjust to 450-550 RPM (in Drive) on all 3.0 and 3.8L vehicles. See Figure .
NOTE:
On 5.0L and 5.7L engines, the distributor set timing connector should be unplugged before the following procedure is attempted. See Figure
.
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.