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muaDib

New Member
Mar 29, 2026
1
0
1
Romania

Hyundai i30 N Performance Exhaust Valve Issue​

I have a 2019 Hyundai i30 N Performance Fastback and I’d really appreciate your help, as I’m not sure what else I should check.

On the 25th of last month, I replaced the exhaust valve spring because it had become weak and the valve was making a rattling noise. I installed an upgraded spring, and everything seemed to be fine after the replacement.

Now I’m experiencing the following symptoms:

  • Engine off: the exhaust valve remains open.
  • When starting the car: the valve performs its self-test.
  • Engine running: the valve remains partially open.
  • If I switch the driving mode from Normal to N / N Custom, or vice versa, the valve doesn’t move at all (it doesn’t open or close).
  • I also reset the car by disconnecting both the positive (+) and negative (-) battery terminals for 25 minutes. After that, it doesn’t make any pops at all anymore.
What could be causing this issue? Has anyone experienced something similar?

What else should I check, or what tests could I perform to identify the problem?

Any suggestions or similar experiences would be greatly appreciated. Thank you!

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