Kia Optima 2004 v6 LX new engine old transmission no problems before with transmission now my transmission is shifting a high rpm
I purchased a used engine before there weren't any transmission problems now my transmission is shifting at high rpm around 4000
Experienced mechanics share their insights in answering this question :
Hi There,
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
An engine that is hesitating to accelerate is most likely dealing with a fuel/air mixture that is too lean. Engine`s that are running inefficiently will begin to show signs like hesitation which will only become worse over time.
Common reasons for this to happen:
Loose connections at the positive and negative battery terminals. Very dirty or clogged air filters can also cause your engine to underperform.
In addition to door issues, some model years of Kia Optima might exhibit a check engine light or loss of power courtesy of a faulty throttle position switch. Furthermore, some Optima models might experience an issue with the transmission control module that results in abnormal shifting.
Remove the dipstick, being careful not to spill or drip any fluid. Wipe off the dipstick with a clean rag, just as you would do when checking the engine oil. Reinsert the dipstick, then remove the dipstick again to check the fluid level. If you need to top it off, be sure to use the recommended transmission fluid.
The oxygen sensor problem is the number one reason cars are slow to accelerate. The oxygen sensor is responsible for monitoring the air-to-fuel ratio in the engine, and over time it can become dirty or damaged, which will decrease power. Oxygen sensor malfunction will result in a mixture being too lean.
A poor fuel delivery drains out the power of the engine resulting in poor acceleration. Fuel filter – A dirty or clogged fuel filter affects the fuel supply to the engine and thus the engine has low power causing poor acceleration. Other parts of the fuel system are the fuel injector and fuel pump.
The most prevalent cause of vibration is problems with your wheels or tires. The potential problems include improper wheel and tire balance, uneven tire wear, separated tire tread, out of round tires, damaged wheels and even loose lug nuts.
#1 – Damaged Inner CV Joint
When the inner CV joint is damaged or begins to fail, you will notice your car vibrating under hard acceleration. As it gets worse, the minor vibrations turn to violent shaking when under load. Damaged CV joints usually occur because of a tear in the joint boot.
Although later model years have fewer complaints, the five-year stretch between 2011 and 2015 turned out to be Kia Optima years to avoid and should get a second look if you`re interested in buying one.
The Kia Optima Reliability Rating is 4.0 out of 5.0, which ranks it 8th out of 24 for midsize cars.
The most typical causes of a car not accelerating while driving include a faulty sensor, contaminated fuel or air filters, or a faulty timing belt. Generally, this isn`t something you should ignore.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Kia Optima 2004 v6 LX new engine old transmission no problems before with transmission now my transmission is shifting a high rpm
ANSWER : Hi There,
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.
Transmission shift hard after high speed driving but shifts normal after engine is off for a while.
ANSWER : Hi there. Transmission fluid should be flushed every 50,000 miles to help avoid issues like you are experiencing. So, it’s probably a good idea to have your transmission fluid flushed and filter replaced, as the obstruction of debris or worn out fluid can cause the hard to shift issue you’re experiencing.
Replaced crankshaft sensor and timing belt on 05 kia optima lx after. Kia engine kept stalling cutting off now its still not running
ANSWER : Hello. If the vehicle is not starting after the timing belt was replaced, then the compression needs to be checked as the timing may still be off. If the compression is fine, then the crank sensor may not be installed correctly or it may be defective. I usually install my scan tool to monitor its reading to see if it is working correctly. If it is, then further testing will need to be done as it may have another sensor failure or possibly a fuel system issue. If you need to have this no-start issue diagnosed, consider YourMechanic, as a certified mechanic can come to your home or office to have this resolved.
Car won’t shift into second and has transmission fluid leaking. Transmission is a 200R4.
ANSWER : Hello, this sounds like a problem with the governor, perhaps the governor spring to be specific. If the spring breaks, it will not allow the 1-2 shift. The fluid leak is likely not a big deal on its own – leaking pan gasket or seal.
As to whether the transmission needs to be rebuilt or replaced, that is dependent on whether clutches are slipping, or shifts "solid", proper functioning of up-shifting (clearly a problem there), and downshifting, etc. I would recommend having a reputable transmission shop run full diagnostics to determine if a major overhaul/replacement is in order.
If you’d like a second opinion on this, have one of our mobile technicians properly diagnose your shifting issue firsthand.
Transmission not shifting when engine is running, works when engine is off
ANSWER : It sounds like the clutch will not disengage, which means it either has a failed clutch component or a failed hydraulic component. There is a very real possibility that the transmission will need to come out to repair this issue. The transmission may also have worn or failed synchronizers, which help the gears to go in and out smoothly. The shift issue should be diagnosed by a qualified professional, such as one from YourMechanic. You ideally want to do this before you agree to buy this car, as it could be very expensive.
Transmission problems and the car is pretty new
ANSWER : The transmission on your car has electronic controls and shift solenoids which control gear changes. I suggest getting a thorough test on your transmission to determine possible causes of the failure before overhauling the transmission. The computer should be scanned for codes and all wiring should be checked. Check the transmission fluid for signs of being burned or contaminated. The transmission cooler and lines should also be flushed out. Since your car is not drivable, contact YourMechanic to check the transmission and get a diagnosis so you do not replace the transmission if only a solenoid in the transmission is bad.
Transmission issues, rough shifting and noise
ANSWER : Many different faults can cause the vehicle to shift roughly. The most common would be low fluid level in the transmission, transmission mounts, the torque converter, or one of the shift solenoids. If you’d like to get this checked before moving forward with a repair, a qualified technician, such as one from YourMechanic, will be able to diagnose your shifting issue and perform any repairs required.
Shifting into 2nd at high RPM
ANSWER : Hi there. It is very possible that the speed sensor or shift solenoid is the primary source of this type of issue with the first to second shift. However, a worn out torque converter or an obstruction inside the transmission hydraulic lines can also produce similar symptoms. Since you recently had the fluid and filter changed, it would expect the sensors as being the primary culprit. I would suggest having a professional mobile mechanic come to your location to complete a Check Engine Light inspection, as the code you offered is a specific GMC code that indicates a general transmission problem. The detailed CEL inspection will download the OBD-II codes that we need to accurately determine the source.
