Why is my car's accelerator pedal stiff? Common causes and fixes UK

A stiff accelerator pedal in UK cars is typically caused by issues with the power assistance system, throttle mechanism, or cable friction. The most common causes are: 1) Faulty throttle assist system (common in modern cars like Vauxhall Corsa or Ford Focus), 2) Dirty throttle body (particularly in diesel vehicles like the Volkswagen Golf TDI), or 3) Sticking accelerator cable (more common in older models like the 2010 Mini Cooper). To fix a stiff accelerator pedal: 1) Have your throttle body professionally cleaned (especially important for direct injection engines in cars like the BMW 3 Series), 2) Check and lubricate the throttle cable if applicable, or 3) Visit a qualified mechanic to inspect the electronic throttle control system (common in vehicles like the Mercedes A-Class). When driving in the UK, remember to: 1) Apply smooth pressure to the accelerator, especially in stop-start traffic on motorways like the M25, 2) Match gear changes to engine revs (particularly important for manual transmission vehicles), and 3) Avoid 'riding' the accelerator in traffic queues to improve fuel efficiency - a particular consideration with rising UK fuel prices.