Gear problems when changing from 3rd to 2nd end up in 4th and 1st ends up in 3rd.

I bought a used Suzuki Swift (1.5 Petrol) one month ago.
I have noticed an issue with the gear that I can summarise like this: changing gear from 3rd to 2nd often lead to 4th, and putting 1st from neutral often lead to 3rd.
Sometimes it happens I start the car with 3rd!
The problem is intermittent, sometimes (80% of times it works perfectly).
I have been driving for 12 years and I do not think it's only a matter of getting used to the new car.
I understood it is a quite common problem for the Swift of those years, and it is resolvable by changing the selector (part no. 28100-63j03).
Do you
Experienced mechanics share their insights in answering this question :
Hi there. Yes the selector is not working and needs replaced. The selector rod or spring could be damaged causing the shifter to be too wobbly or out of alignment making the shifter go into other gears. If you need further assistance with your shifter issue, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Hard, and sometimes impossible shifting into first and reverse is caused by the clutch disc not moving away from the spinning flywheel. This is commonly referred to as the “clutch is not releasing”. The number one cause is the hydraulic system that operates the clutch is leaking and has low fluid.
This could be caused by a worn clutch, a damaged clutch cable or hydraulic system, or other issues with the clutch assembly. Transmission problems: If the transmission is damaged or worn, it may not be able to shift into 1st or 2nd gear.
Popping out of gear is a common problem when it comes to manual transmissions. The most common reason a manual transmission would jump out of gear is due to low or contaminated fluid, worn synchronizers inside the transmission, or improperly adjusted shift linkage.
In most cases this is caused by wear of the 3/4 shift fork and/or wear of the 3/4 synchronizer assembly; most notably the synchronizer sleeve. The only fix is to go inside the transmission.
This issue may be caused by a couple of different things. A gasket near the transmission filter where it mounts to the valve body could be leaking causing the hydraulics within the transmission not to engage second gear properly. On the other hand, a shift solenoid may also be at fault.
Manual Transmission: Worn-Out Clutch

The clutch disc is a wearable component that may need regular replacement on your vehicle. If the manual transmission is slipping, losing power and difficult to shift, you may need the clutch adjusted or the clutch disc replaced.

The most common reasons a manual transmission failed are lack of lubrication, incorrect lubrication and improper or no clutch release.
Automatic transmissions that shift hard, jerk or shake during a shift change may mean your transmission fluid needs changed or fluid level is low. In manual transmission vehicles, abnormal gear shifts could indicate damaged gear synchros, worn clutches or other, more severe issues.
When something`s wrong with the synchronizer, the first sign is usually a whirring or humming noise. This is the case if you`re hearing the sound at just one specific gear, rather than through the full range of gears. Similarly, problems with the synchronizer can cause a grinding sound.
The main reason the car won`t go into gear is that the level of transmission fluid in the vehicle is lower than required. If the level is low despite regular maintenance, there may be a leak. Transmission fluid, therefore, is important to ensure that the car`s moving parts are properly lubricated for functioning.
Turn off your vehicle`s ignition and wait patiently for 5 to 10 seconds. Start the engine and allow it to idle for several seconds. Switch off the ignition and wait patiently for another 30 to 40 seconds. Repeat these steps 2 to 3 times in order to reset your vehicle`s transmission control module.
If your car is not accelerating properly, check the air filter. The air filter traps dirt, debris and other impurities to keep them from entering the combustion chamber. A clogged air filter starves an engine of much-needed air, skewing the air/fuel mixture that affects acceleration.
Some cars have an interlock that prevents downshifting to 1st above a certain speed. This prevents the driver from accidentally downshifting to 1st instead of 3rd, which could damage the engine and transmission. If the stick simply won`t move into 1st until you stop, your car might have this interlock.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Gear problems when changing from 3rd to 2nd end up in 4th and 1st ends up in 3rd.
ANSWER : Hi there. Yes the selector is not working and needs replaced. The selector rod or spring could be damaged causing the shifter to be too wobbly or out of alignment making the shifter go into other gears. If you need further assistance with your shifter issue, then seek out a professional, such as one from Your Mechanic, to help you.

Loose gearbox that won’t find 2nd or 5th gear, sometimes hard to differentiate between 1st and 3rd.
ANSWER : There are a couple of possibilities. The first thing that comes to mind is of course the shifter itself. There is a nylon ball and socket joint at the base of the gearshift lever that sometimes falls apart, making the feel of the shifter very vague. Additionally, there are links to the transmission shift linkage that involve nylon bushings and joints that can fall apart. Both problems are very common on your car. The other less common possibility is that you have a bad motor mount that is allowing the transmission to move around too much when you try to shift gears. either way, it’s not a big deal to fix, and probably won’t require expensive transmission work. If you contact Your Mechanic, they can send a technician to your home or office to check out you shifting issue and let you know what repairs it will take to correct it.

My manual car won’t go into gear, it turns on and the clutch goes down perfectly fine. It happened after my gears grinded, the car
ANSWER : If the clutch mechanism is releasing properly, and the shift linkage is not malfunctioning, your transmission will have to be removed from the vehicle and inspected. Once a transmission has been removed from a vehicle, if the problem is a broken or worn part or parts, and the transmission has 100,000 miles or more, the most cost effective approach is to just simply rebuild the whole transmission. There are transmission rebuild kits that are sold just for this purpose. Rebuilding a transmission is no big deal and is indeed easier in many respects than rebuilding an engine. You can rebuild your transmission right in your own garage. You can NOT rebuild an engine in your own garage due to the highly specialized, and extremely costly, machine shop equipment required. Occasionally, mobile mechanics will take on a transmission rebuild job especially as once the mechanic removes the transmission from the vehicle, it is just simply a modular unit that can be easily transported to a mechanic’s shop and rebuilt right there and then returned to your vehicle. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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ANSWER : Hi there. You may be having an engine misfire since it is only when you are accelerating. The misfire may be due to worn spark plugs or the ignition system coil failing. The ignition system includes the spark plugs, wires, and coils which need to be checked for signs of failure. I recommend having the engine completely diagnosed and scanned for codes to see what is causing the misfire in the engine. You may only need a tuneup or may need more ignition components. I recommend having a technician, such as one from YourMechanic, inspect for trouble codes and replace any failing components.

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My manual gear box is starting to get a little bit "clunky" as i change gears, is there an additive i can add to the gear oil?
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