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 MANUALSGMC1992VALUE VAN 4.3 Z, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - SPECIFICATIONSFUEL SYSTEMIDLE SPEED & MIXTURE
1992 GMC Value Van 4.3 Z, Automatic
Idle Speed & Mixture
1992 GMC Value Van 4.3 Z, AutomaticSECTION Idle Speed & Mixture
NOTE:
Idle mixture on fuel injected models is controlled by the Electronic Control Module (ECM) and is not adjustable. Controlled idle speed and IAC count can be checked using scan tester. See CONTROLLED IDLE SPEED & IAC COUNT table.
CONTROLLED IDLE SPEED & IAC COUNT
| Application | Idle RPM | (1) IAC Counts | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.5L TBI "S" Series | |||||||||||||||
| Auto. Trans. (2) | 800 | 15-40 | |||||||||||||
| Man. Trans. (3) | 900 | 5-20 | |||||||||||||
| 2.8L TBI "S" Series | |||||||||||||||
| Auto. Trans. (2) | 800 | 5-20 | |||||||||||||
| 3.1L TBI "U" Series | |||||||||||||||
| Auto. Trans. (2) | 600-700 | 5-15 | |||||||||||||
| 3.8L PFI "U" Series | |||||||||||||||
| Auto. Trans. (2) | 650-750 | 16-20 | |||||||||||||
| 4.3L CPI | |||||||||||||||
| "L" Series Auto. Trans. (2) | 625 | 5-50 | |||||||||||||
| "M", "S" & "T" Series Auto. Trans. (2) | 550 | 5-40 | |||||||||||||
| 4.3L PFI Turbo "S" & "T" Series | |||||||||||||||
| Auto. Trans. (2) | (4) | 1-50 | |||||||||||||
| 4.3L TBI | |||||||||||||||
| "C" & "K" Series | |||||||||||||||
| Auto. Trans. (2)(5) | 537 | 5-30 | |||||||||||||
| Auto. Trans. (2)(5) | 650 | 20-35 | |||||||||||||
| Man. Trans. (3) | 550 | 2-20 | |||||||||||||
| "G" Series | |||||||||||||||
| Auto. Trans. (2) | 538 | 5-30 | |||||||||||||
| Man. Trans. (3) | 650 | 5-30 | |||||||||||||
| "L" Series | |||||||||||||||
| Auto. Trans. (2) | 625 | 5-50 | |||||||||||||
| Man. Trans. (3) | 600 | 3-30 | |||||||||||||
| "M" Series | |||||||||||||||
| Auto. Trans. (2) | 538 | 5-30 | |||||||||||||
| "P" Series | |||||||||||||||
| Auto. Trans. (2) | 650 | 20-35 | |||||||||||||
| 5.0L TBI "C" & "K" Series | |||||||||||||||
| Auto. Trans. (2) | 500 | 5-30 | |||||||||||||
| Man. Trans. (3) | 600 | 5-30 | |||||||||||||
| 5.7L TBI | |||||||||||||||
| "C", "G", "K" & "P" Series | |||||||||||||||
| Under 8500 GVW | |||||||||||||||
| Auto. Trans. (2) | 525 | 5-30 | |||||||||||||
| Man. Trans. (3) | 600 | 5-30 | |||||||||||||
| Over 8500 GVW | |||||||||||||||
| Auto. Trans. (2) | 550 | 5-30 | |||||||||||||
| Man. Trans. (3) | 600 | 5-30 | |||||||||||||
| 7.4L TBI | |||||||||||||||
| "C", "G", "K" & "P" Series | |||||||||||||||
| Auto. Trans. (2) | 750 | 5-30 | |||||||||||||
| Man. Trans. (3) | 800 | 5-30 | |||||||||||||
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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.