V6 Engine RPM going up and down (when cold)

[GennyV6]

Hello,

I rented a Genesis V6 (2009/47,000 KM) few weeks ago

I noticed that when I turn the car on in the morning, and while it is cold, the RPM goes up and down in a strange way, and I can hear the engine sound going up and down

But when the car warms up, the RPM starts to settle and move down to 1,000 and lower

What would be the problem ?

The spark plugs ? (not changed for long) ?

 

[Mark_888]

The plugs are supposed to last 100,000 miles on the US version. I am sure they are the same plugs as the Canadian version, but not sure what Hyundai Canada says about their life.

I certainly have not experienced what you described, nor do I recall seeing any other posts about that problem.

 

[ctrcbob]

That rental needs to have its ECM reflashed.