140334W010 Nissan GASKET-MANIFOLD,UPPER, Price: 9.17$, Weight: 0.03kg

Upper Intake Manifold Seal – OE-fit, leak-free performance

This precision upper intake manifold gasket seals the joint between the plenum and lower runners, keeping the engine’s air path tight for smooth power and stable idle. A healthy seal prevents unmetered air from sneaking in, so the ECU can control fuel trim correctly. Expect crisp throttle response, cleaner combustion, and better fuel economy ⛽.

How it works ✅

Under proper torque, the molded sealing ribs compress evenly around ports to block vacuum leaks. Heat-resistant elastomer and a rigid carrier maintain clamping load through thousands of heat cycles. The design resists hardening, shrinking, and blow-by, keeping long-term sealing integrity.

Why you need it

Any time the plenum is removed (plugs, injectors, valve cover service), this gasket should be renewed. Reusing old seals risks distortion and air leaks that the MAF can’t measure.

If the seal fails ⚠️

Expect rough or high idle, hissing sounds, hesitation on tip-in, lean codes (CEL), reduced power, and increased fuel use. Prolonged vacuum leaks can cause misfires, carbon buildup, and catalytic converter stress.

Install notes

Clean both surfaces, seat the gasket dry unless the service manual specifies otherwise, and torque the plenum in a crisscross pattern to spec. Replace brittle hoses while you’re there for best results .

Compatibility

• Qx4