[gerrielperez]

2016 Kia Optima SXL. Push button start (if that matters).

Can anyone relate to this? Once in a blue moon car will have a rough start up. But like 98% of the time it's fine.

When it does happen, it sounds weak, but usually if I get moving it goes back to normal.
Sometimes (very rare) it's so weak that it dies and I have to press start again.

Anyone know what this is? Spark plugs, coils, battery?

Just seeing if I can fix this on my end because engine bay has aftermarket air intake, strut bar and bov. I don't want to have to bring it into dealership if I don't have to.
I assume they'd place blame on whatever aftermarket parts they can. I do have stock parts but would like to avoid the hassle swapping.

Purchased car less then a year ago from dealership so I assume whatever engine recalls were done.

 

[gerrielperez]

Also worth noting about to hit 82,000km had the car since 60,000km so I do believe spark plugs are due.
Believe I had this issue since 60,000km, it just so rarely comes up that I let it go.
Just wanted confirmation if people think that's the issue.

Also tried running CRC intake/turbo cleaner.

 

[Turbonut]

Plugs should be replaced 45k miles or @ 72000km, but they won't make the difference.
I'd first have the battery load tested, clean terminals and cable ends.

 

[missclough]

Thanks Turbonut!

JT

 

[Chrissskiaaman]

Thanks Turbonut!

JT

Having somewhat same issue the cranking sounds weak but battery is new and spark plug and fuel system all works but won't start at all just cranks real weak sounding.