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 MANUALSCHEVROLET1998ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYSYSTEM SPECIFICATIONSINTAKE MANIFOLD TORQUE & SEQUENCELOWER INTAKE MANIFOLD
1998 Chevrolet Astro Van 2WD V6-4.3L VIN W
Lower Intake Manifold
1998 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Lower Intake Manifold
Tighten the lower intake manifold bolts.
1. Tighten the bolts on the first pass in sequence (1-8) to 3 Nm (27 inch lbs.).
2. Tighten the bolts on the second pass in sequence (1-8) to 12 Nm (106 inch lbs.).
3. Tighten the bolts on the final pass in sequence (1-8) to 15 Nm (11 ft. lbs.).
NOTICE: Proper lower intake manifold fastener tightening sequence and torque is critical. Always follow the tightening sequence, and torque the intake manifold bolts using the 3 step method. Failing to do so may distort the crankshaft bearing bore alignment and cause damage to the crankshaft bearings.
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.