What could be the problem when the car doesn't accelerate even with the throttle fully pressed?

[DiElijah]

When the car doesn't accelerate even with the throttle fully pressed, it could be an issue with the transmission, or there might be a problem with the sensors or the computer inside the engine. In such cases, it is recommended to visit a professional institution or a 4S shop where technicians can use a diagnostic computer to read the fault codes. These codes can help the technicians quickly identify the faulty part and the cause of the issue. It is also normal for the electronic systems around the car engine to develop faults after prolonged use, as the temperature in the engine compartment is relatively high. Electronic systems operating in high-temperature environments for extended periods are prone to faults. If the electronic system is damaged, it can simply be replaced. When replacing, always opt for original equipment manufacturer (OEM) parts, as they offer better reliability and durability.

[DeGarrett]

It's really frustrating when the car can't pick up speed. As a mechanic, I've encountered this issue quite often. The most common cause is fuel system problems, such as a faulty fuel pump or clogged fuel injectors, which lead to insufficient fuel supply and a weak engine. Don't overlook the air intake system either – a dirty air filter can restrict airflow, resulting in incomplete combustion. The ignition system can also be a culprit if the spark plugs are fouled or the coils are malfunctioning. Transmission issues, like slipping, can prevent power from reaching the wheels. Additionally, faulty ECU sensors might trigger a speed limiter as a safety measure. For safety, don't push the car too hard. You can check the air filter and fuses yourself, but other issues should be handled by a professional. Regular maintenance, including oil changes and carbon deposit cleaning, can help prevent major problems.

[SavannahDella]

When I floored the throttle in my old car, the speed just wouldn't go up, so I asked a mechanic. He said it might be due to insufficient fuel supply from the fuel pump, or the air filter being too dirty and blocking the intake. I've also experienced weak ignition caused by aging ignition coils, or the ECU limiting speed due to incorrect temperature or pressure readings. I usually pay attention to maintenance, cleaning the throttle body and changing the transmission fluid, but this time the issue is in the fuel system. Older cars have more worn-out parts, so don't wait for major problems—regularly check fluids and filters. If you notice the speed won't increase while driving, slowly pull over to the roadside and avoid sudden acceleration to prevent engine damage.

[DiGriffin]

For those into car modifications, if the car accelerates slowly when the throttle is fully pressed, the issue might be improperly tuned aftermarket parts. Even stock cars often face fuel injection problems or intake restrictions, along with faulty mass airflow sensors. The ECU may limit response time to protect the engine. Carbon buildup can affect combustion efficiency, making the throttle feel sluggish. Check the air filter, fuel pump, and ignition system. An OBD scan can help identify the problem points. Regular maintenance is recommended to prevent carbon buildup, especially for high-performance cars which are more sensitive.

[VonMalachi]

Decades of driving experience: If the accelerator is hard to press and the speed won't increase, first check if the tire pressure is too low, increasing resistance. A worn fuel pump causes unstable fuel supply, and a clogged air filter reduces air intake. A dirty engine with carbon buildup leads to poor combustion, and incorrect ignition timing. Old transmission oil causing slippage can also be the reason. Don't wait until the engine blows to regret; regularly clean the throttle body and replace the three filters to save money and hassle. Drive safely, slow down and pull over when encountering problems—don't push it.

[LaArianna]

New drivers encountering sudden full throttle without acceleration, don't panic. I consulted experts - possible causes include fuel system issues like fuel pump failure restricting supply, or insufficient airflow from clogged air filters. Faulty ignition components or sensors triggering ECU speed limitation. Recommendation: Avoid DIY repairs (error-prone), visit authorized shops for computer diagnostics. Prioritize safety: reduce speed and park safely when occurring. Regular maintenance minimizes such unexpected failures.