2014 Hyundai Elantra GT - What is this thing?

Maintenance/Repairs
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what is a intake vvt solenoid

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Hyundai Elantra GT Variable Valve Timing (VVT) Solenoid Replacement Costs (yourmechanic.com)

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Symptoms of a Bad or Failing Variable Valve Timing (VVT) Solenoid | YourMechanic Advice In your case, the solenoid for the intake valve (duh!) would be the problem.