What causes a car to lack power when accelerating beyond 100 km/h?

[MollyLynn]

It may be due to carbon buildup in the vehicle's engine. Below is relevant information about carbon deposits:1. First concept: Refers to engine carbon deposits, which are a coking-like substance formed from unsaturated olefins and gums in fuel under high temperatures during engine operation.2. Second concept: Refers to carbon deposits in electrical discharge machining, which should be avoided as much as possible, especially in precision mold processing where it can have fatal effects.3. Additional information: Performing necessary cleaning on the car's intake system is the most effective method to reduce carbon deposit formation. Therefore, owners can perform necessary cleaning on the vehicle's intake system at approximately 30,000 kilometers.

[OMaddox]

When driving on the highway, once my speed reaches 100, pressing the accelerator feels like it has no response, and acceleration becomes particularly sluggish. This is often due to issues with the fuel system, such as a clogged fuel filter or obstructed fuel lines leading to insufficient fuel supply. Another common cause is a dirty air filter, which reduces air intake and weakens engine performance. Exhaust system blockages, like carbon buildup in the catalytic converter preventing exhaust gas from escaping, can also be a culprit. The ignition system might be faulty too, with aged spark plugs or ignition coils failing at high speeds. Increased wind resistance at high speeds also drains power, and sometimes using low-quality fuel worsens the problem. After experiencing this, I immediately replaced the fuel and air filters, which significantly alleviated the issue. Regular maintenance should include checking these components, and prioritizing safety during overtaking means not delaying repairs.

[PeytonAnn]

Having driven for over a decade, it's common to experience sluggish acceleration when exceeding 100 km/h. Typically, this indicates limited engine power output, possibly due to transmission tuning issues—higher gears may lock up with delayed shifting. Alternatively, an aging fuel pump might cause insufficient fuel delivery, especially in older vehicles. Aerodynamic design creating excessive drag at high speeds could also be a contributing factor. I recommend checking tire pressure and tread wear, as imbalance increases rolling resistance. Occasionally, the ECU system may falsely trigger power output limitations, requiring diagnostics. Address any issues promptly to avoid roadside breakdowns, which are particularly unsafe on highways. Regular maintenance of transmission fluid and air filters can prevent most such failures, ensuring smooth driving.

[DelMadelyn]

I prioritize driving safety, and experiencing weak acceleration at speeds above 100 km/h is particularly dangerous, especially when overtaking on mountain roads. Key causes include a malfunctioning turbocharger leading to insufficient intake pressure, or fuel system contamination causing clogged filters. In some vehicles, an aged catalytic converter in the exhaust system restricts exhaust flow, suffocating the engine. This issue becomes more pronounced under high loads, such as climbing hills, possibly due to carbon-fouled spark plugs causing delayed ignition. I immediately pull over to inspect or call for a tow truck—persisting is too risky. For prevention, using high-quality fuel to clean the fuel lines and regularly consulting the maintenance manual for timely part replacements ensures safe, worry-free driving.