Engine — rough idle on cold start The p0421 code indicates catalyst. At about 4400 miles my check engine light came on upon a cold start when the engine rev'd high and then stumbled a bit before the idle smoothed out
Kia Optima History: Its Models, Generations & More | dubizzle
I did not have any power loss though.
Learn how the cold start process works and diagnose the hidden air, fuel, and ignition weaknesses causing the problem.
Diagnose and fix rough idle issues in your kia optima by understanding common causes, symptoms, and effective troubleshooting methods at repairpal.com. Discover why your car starts rough but smooths out as it warms up You have a rough idle if you feel the roughness when your car idles, but drives smooth This is usually caused by a change in the amount of air going to.
Car idles rough when cold then smooths out Here are 8 causes (carbon buildup, vacuum leaks, bad sensors) with easy fixes under $300 This, only if not driven for a solid 24+ hours, and not all. Learn about the common causes of rough idling and how to troubleshoot and fix the issue.
When i start it for the first time every day (regardless of time of day) the engine runs very rough for the first minute or two
When you listen to the exhaust pipe the engine clearly has at least. The best way to avoid a rough engine idle is to perform routine preventive maintenance on your vehicle, starting with manufacturer recommendations In this video josh explains the 4 most common causes for rough idling as well as a few other less common culprits He walks through step by step how to figure out and fix what's causing your car.
A “rough” idle is just like a normal idling engine speed, except it is irregular and not as smooth as we’ve become accustomed to with our modern,. Field cortex automotive reference for 1997 kia optima Field cortex automotive reference for 2025 kia optima A rough idle worsening with ac and power loss can stem from faulty sensors like the throttle position sensor (tps) or manifold absolute pressure (map) sensor
