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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE PERFORMANCE SYSTEM ADJUSTMENTS - 5.0L)IDLE SPEED & MIXTURECONTROLLED IDLE SPEED CHECK
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
Controlled Idle Speed Check
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Controlled Idle Speed Check
WARNING: This page is about a different variant/trim than selected.
- Ensure no trouble code(s) are present, IAC system is okay, and ignition timing is correct. Block drive wheels. Apply parking brake. Connect Tech 1 scan tool to Data Link Connector (DLC). Put scan tool into OPEN mode.
- Start engine and bring to normal operating temperature. Check for correct state of transmission range switch on scan tool. Check if idle speed and IAC valve pintle position (counts) are as specified. See CONTROLLED IDLE SPEED & IAC COUNT table.
- If idle speed is not within specification, refer to the TESTS W/O CODES - 5.0L article.
CONTROLLED IDLE SPEED & IAC COUNT
| Application | Idle RPM | (1) IAC Counts | ||||||
|---|---|---|---|---|---|---|---|---|
| Auto. Trans. (2) | 675-725 | Varies | ||||||
| Man. Trans. (3) | 675-725 | Varies | ||||||
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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.