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 MANUALSGMC1988MAGNAVAN 6.2 J, 400/M40LABOR TIMESOTHER VARIANTENGINE PERFORMANCEFUEL DELIVERY SYSTEMINTAKE MANIFOLD GASKETREMOVE & REPLACE
1988 GMC Magnavan 6.2 J, 400/M40
Intake Manifold Gasket: Remove & Replace
1988 GMC Magnavan 6.2 J, 400/M40SECTION Remove & Replace
WARNING: This page is about the Magnavan 5.7 K, 400/M40, which is a different variant/trim than selected.
CARBURETION
| Applies To | Note | Standard Hours | Warranty Hours | Skill Level |
|---|---|---|---|---|
| G3500,V8, w/Air Cond | 3.9 | 3.0 | B | |
| G3500,V8, w/o Air Cond | 3.6 | 2.7 | B |
FUEL INJECTION - GAS, TBI
| Applies To | Note | Standard Hours | Warranty Hours | Skill Level |
|---|---|---|---|---|
| G3500,V8 | 3.6 | 2.7 | B | |
| Additional Procedure: INTAKE MANIFOLD GASKET: Remove & Replace: | ||||
| G3500, Air Cond Compressor,One,Where Air Cond interferes add | 0.2 | 0.2 | B | |
| G3500, Two Air Cond Compressors,Where Air Cond interferes add | 0.8 | 0.8 | B | |
| Where Cruise Control interferes add | 0.2 | 0.2 | B | |
| Where Elect Eng System interferes add | 0.5 | B | ||
| Combination Procedure: INTAKE MANIFOLD: Replace: | ||||
| V8 | 0.3 | 0.3 | B | |
FUEL INJECTION - MECHANICAL, DIESEL
| Applies To | Note | Standard Hours | Warranty Hours | Skill Level |
|---|---|---|---|---|
| G3500, w/Air Cond | 2.6 | 1.9 | B | |
| G3500, w/o Air Cond | 2.2 | 1.6 | B | |
| Combination Procedure: INTAKE MANIFOLD: Replace: | ||||
| V8 | 0.2 | 0.2 | B | |
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.