Kia Optima: If the engine doesn't turn over or 
turns over slowly - If the engine will not start - What to do in an emergency - Kia Optima TF 2011-2025 Owners ManualKia Optima: If the engine doesn't turn over or turns over slowly

1. If your vehicle has an automatic transaxle, be sure the shift lever is in N (Neutral) or P (Park) and the emergency brake is set.

2. Check the battery connections to be sure they are clean and tight.

3. Turn on the interior light. If the light dims or goes out when you operate the starter, the battery is discharged.

4. Check the starter connections to be sure they are securely tightened.

5. Do not push or pull the vehicle to start it. See instructions for "Jump starting".

If the engine will not start
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If engine turns over normally but does not start
1. Check fuel level. 2. With the ignition switch in the LOCK position, check all connectors at the ignition coil and spark plugs. Reconnect any that may be disconnected or loose. 3. Check th ...

See also:

Reassembly
1. Reassemble the CVVT assembly (A) and camshaft (B). Tightening torque :53.9 ~ 63.7N.m (5.5 ~ 6.5kgf.m, 39.7 ~ 47.0lb-ft) ...

Engine Coolant Temperature Sensor (ECTS). Description and Operation
Description Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage of the cylinder head for detecting the engine coolant temperature. The ECTS uses a thermistor that ...

Defroster
CAUTION To prevent damage to the conductors bonded to the inside surface of the rear window, never use sharp instruments or window cleaners containing abrasives to clean the window. ✽ NO ...

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