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 MANUALSPONTIAC1987J2000/SUNBIRD L4-121 2.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESPORT FUEL INJECTION MODELSFUNCTION SELECTOR POSITIONSIAC - IDLE AIR CONTROL
1987 Pontiac J2000/Sunbird L4-121 2.0L
IAC - Idle Air Control
1987 Pontiac J2000/Sunbird L4-121 2.0LSECTION IAC - Idle Air Control
The IAC is controlled by the ECM to maintain specified idle speed. The ECM controls the IAC in with voltage pulses (counts) and these counts are displayed in this position. The number of counts displayed represents the position the ECM ``thinks'' the IAC is in. Normal readings are in the 5-50 range.
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.