Gear performance

When I start to drive and the car moves, it has no pick up probably due to it starts from second gear instead of the first gear.

And when it travels at 100km/hr, the engine sound is like roaring as if it is moving at low gear.

What could be the problem?

Experienced mechanics share their insights in answering this question :
Your transmission is stuck in one gear, most likely the second gear. It could be shifting into third, but I can’t say for sure. This can occur for two reasons. Either the transmission is failing or your car has gone into limp mode. Limp mode exists to keep the car from further damage and usually won’t allow you to go above about 30 MPH. The speed will be different with every manufacturer. The motor is roaring because it is turning at a very high RPM (revolutions per minute). I would lean toward a transmission problem because the motor is roaring so loudly. Usually, limp mode won’t allow this.

Your car needs to be diagnosed very soon to figure out if you are going to need a transmission or if something else is putting it into limp mode. This condition can cause some catastrophic problems if not taken car of sooner than later. If you need help having this checked, have a local professional, like one from YourMechanic, come to your car’s location to inspect the gear issue and advise you on a repair.

How to Identify and Fix Common car Problems ?

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

Torque converter difficulties, planetary gear system failure, and a low fluid level in the transmission are the most prevalent causes of automatic automobile noise when shifting gears. If you hear a whimpering sound, it could indicate that anything is wrong with your vehicle.
Limp mode causes

Transmission errors – such as when the gearbox can`t change gears properly. Brake malfunctions – seized brakes or a hydraulic leak in the system. Wiring issues – a problem with the wiring loom may cause erratic behaviour.

If your transmission mount or engine mount becomes loose or breaks, you may hear clunking noises whenever you make a sudden change in speed or whenever you shift gears, due to the movement of the unsecure mount.
If the sound resembles humming, buzzing, or clunking, you may be experiencing transmission failure. Bad automatic transmissions may emit humming, buzzing, or whining noises while manual transmissions have harsher “clunking” sounds.
My Gears Are Clunking, Clicking Or Rattling

These noises usually mean that your gearbox or engine is on it`s way to failing, which can be catastrophic if you are driving at the time. For this reason, you should try and have the car collected rather than driving it to the garage.

In automatic transmission vehicles, the car will automatically go into limp mode if there is any fault with the transmission. The limp mode is also activated when the transmission control unit determines that the vehicle`s clutch is broken, damaged, or defective.
Limp Mode: Performance Reduction

Power limitations – in most cases the car will not shift out of second gear, RPM will be capped around 3,000 RPM, and you`ll find that the speed is also limit to no greater than 45 MPH. You may find that this means you have to take the first available exit if you are on a motorway.

The most common source for humming or whirring transmission noises is low fluid level or fluid contaminated with metal shavings. If the humming sound happens in all gears, there could be a problem with a worn or damaged shaft, shaft end play spacer, or bearing.
Shift shock is the jolt felt when transmission changes gear. This jerk or shock feeling is observed in. lower gear shift (i.e. 1-2 or 2-3) and not in higher gears shift (i.e. 5-6 or 6-7).
Major transmission repair requires disassembling, inspection, cleaning, and rebuilding. It`s labor intensive and cost prohibitive. Luckily, transmission failure doesn`t usually happen without warning.
Similarly, problems with the synchronizer can cause a grinding sound. If the sound comes only when you`re downshifting, look into synchro problems. Problems with the gears themselves are also an indicator of synchronizer issues.
Transmission Gear Ratios

Without a transmission, once you reach your engine`s redline, that would be it, no more acceleration; you top out speed-wise. Add another gear to your transmission and you can engage it and keep accelerating, or maintain your current speed at a lower and more efficient RPM.

Sudden loss of power. Should you be unaware of this feature on your vehicle, it can be disconcerting if limp mode flashes up on your dashboard during a journey, particularly if you`re driving at speed. The vehicle will not come to a halt, but its speed and performance will be greatly reduced.
You can bypass limp mode by restarting your car, checking the fluid levels, disconnecting the battery, or scanning it with an OBD scanner. When limp mode is active, you should avoid driving unless absolutely necessary. Avoid highway travel and take routes that are less traveled.
When the internal engine or transmission sensors determine a fault exists inside the transmission (which can be triggered by too much hydraulic pressure due to excessive fluid), it tends to create a limp mode, so you can slowly drive the vehicle to a repair facility.
When the internal engine or transmission sensors determine a fault exists inside the transmission (which can be triggered by too much hydraulic pressure due to excessive fluid), it tends to create a limp mode, so you can slowly drive the vehicle to a repair facility.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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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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.

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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?
ANSWER : The first thing to do is to drain and check the oil to see if it has any broken chunks of metal or a lot of brass metal pieces that indicate the gears and synchronizers for the gears are bad. If no metal is found then replace oil with recommended oils for transmission. If metal is found then an internal transmission repair is needed.

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Gear Shuffling Problem in Vauxhall Vectra 52 Registration
ANSWER : Hi there. We don’t see a lot of Vauxhall Vectra’s here in the United States, so unfortunately, we’re not able to suggest a possible solution or cause of this problem you’re experiencing. You should consult with a professional mechanic in your home town to determine what’s causing the shifting problem you’re experiencing.

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Sifter floats from gear to gear and when letting out the clutch there is no response.
ANSWER : Hi there. Either the clutch has failed causing the transmission not to engage in any gear, or the transmission shifter plastic rings broke and will not engage the shifter. Check the clutch and make sure that it is moving when the pedal is pressed down. If the fork on the bell housing is moving and the wheels can be moved when the clutch pedal is depressed and then the wheels not moving when the pedal is let up, then the clutch should be in an okay shape. Most likely the plastic rings on the shifter housing has broke and making the shifter move around. If you need further assistance with the shifter moving around too much, then seek out a professional, such as one from YourMechanic, to help you.

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My truck won’t allow me to change gears even when pressing the clutch. No gears go in at all. Makes it impossible to drive.
ANSWER : Hello, this concern is possibly the slave or clutch master cylinder failure. These two components use brake fluid to apply pressure for movement of the clutch system. This fluid breaks down in time and causes the seals to fail (leak). A low fluid level would cause this concern as well as internal leakage. Replacement of components would be necessary. This type of concern would need to be inspected. If you’d like, a certified technician from YourMechanic can come to your location to diagnose your vehicle, and possibly replace your clutch master cylinder if need be.

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Second gear misshifts when I drive, all other gears are fine.
ANSWER : Hello.

A transmission coming out of gear is most often caused by worn transmission components. It may be possible that the synchronizer rings, which are meant to smoothly mesh the gears inside of the transmission, have worn out and are no longer able to stay in gear.

It may also be possible that the gears themselves have worn out, and can no longer hold the torque of the engine. This is usually preceded or accompanied by a grinding noise when attempting to shift into that gear. If this is the case, it may be possible that the transmission may need to be rebuilt.

As transmission rebuilds can be expensive, I would recommend having the vehicle diagnosed by a professional technician who specializes in transmission, to determine if a rebuild is required.

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Car won’t go into gear. 2002 Audi A4 Quattro
ANSWER : Hi there – Your symptoms describe the behavior to expect when your clutch hydraulics go out (clutch master and clutch slave cylinders). Check your clutch fluid level – it may be low. If the fluid level is low, this usually means your clutch slave cylinder has worn out, not unusual with your mileage, and should be replaced. I recommend a malfunctioning clutch inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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