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 MANUALSGMC1984SUBURBAN C2500, 6.2 J, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER M4MC & M4ME 4-BBLSPECIFICATIONS
1984 GMC Suburban C2500, 6.2 J, 400/M40
Carburetor - ROCHESTER M4MC & M4ME 4-Bbl: Specifications
1984 GMC Suburban C2500, 6.2 J, 400/M40SECTION Specifications
CARBURETOR ADJUSTMENT SPECIFICATIONS
| Application (Carb. No.) | Specification | ||||||
|---|---|---|---|---|---|---|---|
| 17084206 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084220 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084221 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084226 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 30° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084227 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 24° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084228 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084229 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084230 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084231 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084234 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084235 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084290 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 24° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084291 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084292 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 24° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084293 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084294 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084298 | |||||||
| Float Level | 13/32" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | N/A | ||||||
| Secondary | 26° | ||||||
| Air Valve Spring (1) | 7/8 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 39° | ||||||
| 17084500 | |||||||
| Float Level | 3/8" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 37° | ||||||
| Vacuum Break | |||||||
| Primary | 23° | ||||||
| Secondary | 30° | ||||||
| Air Valve Spring (1) | 1 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 40° | ||||||
| 17084501 | |||||||
| Float Level | 3/8" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 37° | ||||||
| Vacuum Break | |||||||
| Primary | 23° | ||||||
| Secondary | 30° | ||||||
| Air Valve Spring (1) | 1 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 40° | ||||||
| 17084502 | |||||||
| Float Level | 3/8" | ||||||
| Accelerator Pump | |||||||
| Stem | 9/32" | ||||||
| Hole | Inner | ||||||
| Choke Coil Lever | .120" | ||||||
| Choke Rod | 46° | ||||||
| Vacuum Break | |||||||
| Primary | 23° | ||||||
| Secondary | 30° | ||||||
| Air Valve Spring (1) | 1 | ||||||
| Auto. Choke | (2) TR | ||||||
| Choke Unloader | 40° | ||||||
|
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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.