Kia Optima: Intake And Exhaust System / Exhaust Manifold
Components and components location

1. Heat protector
2. Exhaust manifold gasket
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3. Exhaust manifold
4. Exhaust manifold stay
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Repair procedures
1. |
Remove the engine cover.
(Refer to Engine and Transaxle Assembly - “Engine Cover”)
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2. |
Disconnect the battery negative terminal.
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3. |
Disconnect the front and heated oxygen sensor connect (A) and remove
them from the bracket.

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4. |
Remove the engine room under cover.
(Refer to Engine and Transaxle Assembly - “Engine Room Under Cover”)
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5. |
Remove the front muffler.
(Refer to Intake and Exhaust System - "Muffler")
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6. |
Remove the exhaust manifold heat protector (A).
Tightening torque :
9.8 - 11.8 N•m (1.0 - 1.2 kgf•m, 7.2 - 8.7 lb•ft)
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7. |
Remove the exhaust manifold stay (A).
Tightening torque :
39.2 - 49.0 N•m (4.0 - 5.0 kgf•m, 28.9 - 36.2 lb•ft)
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8. |
Remove the exhaust manifold (A).
Tightening torque :
29.4 - 34.3 N•m (3.0 - 3.5 kgf•m, 21.7 - 25.3 lb•ft)
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When installing the exhaust manifold, tighten the nuts with pre-torque
first, and then tighten the nuts with specified torque in the sequence
shown.

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9. |
Remove the exhaust manifold gasket (A).

When installing, replace with a new gasket.
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10. |
Install in the reverse order of removal.
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Repair procedures
Removal and Installation
1.
Disconnect the vacuum hose (A).
2.
Remove the variable Intake solenoid (VIS) actuator (B)
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Components and components location
Components
1. Front muffler
2. Catalytic converter & Center muffler assembly
3. Rear muffler
4. Gasket
5. Hanger
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Other information:
Schematic diagrams
Circuit Diagram
Repair procedures
Removal
1.
Disconnect the negative battery terminal.
2.
Remove the photo sensor & auto light sensor (A) by pressing the locking
pins.
3.
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Description and operation
Description
•
Heated Oxygen Sensor (HO2S), consisting of zirconium and alumina, is
installed on both upstream and downstream of the Manifold Catalytic Converter
(MCC) to detect the air/fuel ratio and send it to the ECM.
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