Hyundai Sonata LF 2014-2019 Service Manual: Spark Plug Repair procedures
Inspection
[On vehicle inspection]
1.
Accelerate the engine to about 3,000 rpm 3 times or more.
2.
Remove the spark plug.
3.
Check the spark plug visually.
If the electrode is dry, the spark plug is normal.
If the electrode is wet, check the damage and electrode gap as below.
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Hyundai Sonata LF 2014-2019 Service Manual: Idler Components and Components Location
Components
1. Idler
...