Kia-Forums.com is owned and operated by AutoForums.com, Inc. Kia-Forums.com is an enthusiast website dedicated to the discussion of Kia Vehicles, Kia Family Cars and Kia SUVs. Kia-Forums.com is completely unofficial and is not endorsed in any way by KIA Motor Corp, its affiliates, or its subsidiaries. KIAź is a registered trademark of KIA Motors Corp. in Canada, the United States, and in other countries around the world. No challenge to the status of KIAź's registered trademarks is intended.
I recently acquired an 04 optima 2.4l auto with 120k miles. The car runs and drives fine. No codes. Idle is about 750 rpm in drive, park and neutral. The plugs were replaced with a new set of ngk. The timing belt was recently replaced last year, about 5k miles ago. All the electronics have been tested and checked. Per the kgis solutions are to replace the coils and wires. No change. When the car is idle in drive it idles rough. I have recently added an extra ground wlre which made no change. The idle also seems rougher the colder the outside temperature gets. Any suggestions?
Sadly, this sounds like normal 2.4L idle condition. Mine does the same thing. I bought it with 100K on the odo (currently has 109K). All maintenance is up to date. When I'm at a stop (on the brakes in drive) I also get vibrations. As soon as I put it in neutral it goes away. The only thing I can figure is something with the torque converter. I know it's not the balance shafts in the engine being out of time (already dealt with that).
Hard to believe they all do this? But maybe so. I already replaced the two motor mounts as they were shot. Expensive parts but easy to replace. The dealer thinks replacing the transmission mount might help but no guarantee.
Last edited by jnmarshall; 02-16-2011 at 10:49 AM.
Sounds like normal to me as well. I have a 2004 2.4 Kia Optima LX and it idles roughly. I think the only time it isn't pretty rough is when it is in park. I'll have to check again when the car is work again T_T
Sounds like normal to me as well. I have a 2004 2.4 Kia Optima LX and it idles roughly. I think the only time it isn't pretty rough is when it is in park. I'll have to check again when the car is work again T_T
Park and neutral are also smooth on mine, maybe something to do with the torque converter...
__________________ NEW MEMBERS- Please fill in your profile info in the "user CP" link (year, make, model, location, etc..), it makes it easier for us to help you.
Go to www.kiatechinfo.com and register for free for service information.
Hard to believe they all do this? But maybe so. I already replaced the two motor mounts as they were shot. Expensive parts but easy to replace. The dealer thinks replacing the transmission mount might help but no guarantee.
I owne a 2004 Kia Magentis 2.4 LX with the same rough idle issue in "Drive". You mentionned that replacing the engine transmission mount could help. Did you do it and did it solve the problem?
i disagree with the torque converter theory. If this was the case and it was unbalanced somehow, it would vibrate in every gear ( PRND ) , if it happens when cold and gets smoother as it heats up, it has something to do with heat.
My guess is the balance shaft belt has stretched out and is not in time anymore .
I can't imagine the engine vibrating has anything to do with the tranny
__________________
2004 Optima 2.4 LX auto ( original owner )
i disagree with the torque converter theory. If this was the case and it was unbalanced somehow, it would vibrate in every gear ( PRND ) , if it happens when cold and gets smoother as it heats up, it has something to do with heat.
My guess is the balance shaft belt has stretched out and is not in time anymore .
I can't imagine the engine vibrating has anything to do with the tranny
why would a torque converter be engaging in park or neutral? my 2.7? does the same thing and it really bothers me, but my rpms fluctuate up and down at idle, not sure why. it does not shudder in neutral or park. but mine does occasionally shudder at low speeds coasting off gas at 20-25mph. My bet is torque converter. service the transmission and get some conditioner for it. see if that helps.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Rough idle in drive
Linear Mode
