We’ve got a brand new Kia Rio RX-5. We’ve had it a little over 2 months and it’s got about 6000 km on it. Lately, within the past 2 weeks or so, it’s been hesitating on acceleration when cold. Meaning, it’s been sitting more than 6 hours, mostly overnight. This morning was the worst. I took it to the garage on Saturday for it’s first oil change, they looked it over and said everything is fine, but bring it back if it gets worse. It’s worse.
What could it be? If it was a bad tank of gas, how long would it take to work through? We normally get gas from the same distributor, but went on a trip a few weeks ago and used another.
Do gas additives work for a problem like this?
I’m taking it in Friday to leave it over night and have it checked in the morning.
Could be anything…which is why they’ll need to check it deeper.
Could be a throttle position sensor, polution control sensor, oxygen sensor, etc.
On cars now, the fuel mixture and timing are altered by the on board comp to adjust things so that the emmissions are handled until the whole system warms up properly and the polution control works more efficiently.
Until warmed up, everything is running in a sort of compromised mode for drivability and emmissions purposes. … it could be the fuel mixture is to lean…and once warmed up and running on the reg fuel mixture, things get better.
This is what it sounds like…something related to controlling the fuel mixture/air mixture isn’t working well. It’s less of an issue after the whole system warms up and the settings are more normal and less touchy.
Do put any additives in the car. Leave it be until it is checked and you are told of the problem.
My '86 Buick had this problem when a couple of spark plugs went bad. Could be a bad plug or plug wire. As Philster said, it could be anything. . .it’s under warranty, so let them do whatever they need to do I agree also with Philster’s probable causes. Good luck!
I agree also with Philster’s probable causes. Good luck!