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<h2>Bad exhaust manifold symptoms</h2>
<ul>
<li style="text-align: justify;">Exhaust leaks - Visible cracks, holes, or damage in the exhaust manifold, audible hissing or rumbling sounds coming from the engine compartment, and the smell of exhaust fumes inside the cabin.</li>
<li style="text-align: justify;">Engine performance issues - Rough or uneven engine idle, hesitation or loss of power during acceleration, and decrease in fuel efficiency.</li>
<li style="text-align: justify;">Increased emissions - Failed emissions or smog test, and increased visible exhaust smoke or soot.</li>
<li style="text-align: justify;">Overheating - Elevated engine temperature readings and the smell of burning or overheated components.</li>
<li style="text-align: justify;">Check engine light illumination - Diagnostic trouble codes related to the exhaust manifold or <a href="https://a-premium.com/oxygen-sensor">oxygen sensors</a>.</li>
<li style="text-align: justify;">Vibrations or noises - Rattling, banging, or other abnormal noises coming from the engine compartment, and increased overall engine vibrations.</li>
</ul>
<h2>A guide to exhaust manifold replacement</h2>
To begin the exhaust manifold replacement process, the vehicle must be safely raised and secured on jack stands or a lift. The mechanic will then disconnect the negative battery cable to prevent any electrical issues during the repair. Next, they will locate the exhaust manifold, which is typically situated at the top of the engine, and begin disconnecting it from the rest of the exhaust system. This involves unbolting the manifold from the cylinder head as well as detaching it from the <a href="https://a-premium.com/catalytic-converter">catalytic converter </a>or downpipe flanges.
With the old manifold removed, the mechanic will carefully inspect the mounting surface on the cylinder head to ensure it is free of any debris or damage. They will then install the new replacement manifold, taking care to properly align the bolt holes and create a tight seal with new gaskets. The manifold bolts are tightened to the manufacturer's specified torque, and the entire exhaust system is checked for leaks. Finally, the battery cable is reconnected, and the vehicle is lowered back to the ground, allowing the engine to be started and the repair to be thoroughly tested.
<h2 style="text-align: justify;">A-Premium exhaust manifolds - Engineered excellence</h2>
A-Premium exhaust manifolds deliver reliable performance and lasting durability. Crafted from premium heat-resistant alloys, our manifolds resist warping, cracking, and corrosion. The precision design ensures a perfect fit and secure, leak-free sealing. With enhanced vibration resistance and easy maintenance, A-Premium manifolds help maintain optimal exhaust flow for improved efficiency and emissions control. In addition to offering a 90-day free return policy and a 3-year warranty, our customer service team is available 24/7 to assist you. Trust A-Premium to keep your vehicle's exhaust system running at its best.

Exhaust Manifold

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Air Filter Box

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Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

Oil Filter Base

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Glow Plug Relay Module

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Filler Neck Pipe

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Fuel Tank Strap

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High Pressure Fuel Pump

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Idle Air Control Valve

Mechanical Fuel Pump

Oil Pressure Relief Valve

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

1999 Lincoln Navigator Exhaust Manifold

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