What Causes Abnormal BMW Engine Performance and Power Loss?

[LeBrady]

BMW engine abnormal power loss is caused by fuel supply issues and ignition problems. Fuel supply issues: Focus on checking the fuel pump first, as many BMWs experience engine faults due to fuel pump problems. Additionally, inspect whether the fuel injectors are functioning properly, including fuel atomization quality and potential leaks as secondary priorities. Other fuel supply components rarely cause power loss and can be checked last or omitted. Ignition problems: Possible causes include delayed ignition, damaged spark plugs, carbon/oil deposits or erosion on spark plugs, excessive spark plug electrode gap, insufficient distributor centrifugal advance angle, or malfunctioning vacuum advance mechanism. Priority checks should start with spark plug carbon buildup/damage, followed by ignition timing verification, then other potential issues. Solutions: Replace dirty air filter; replace clogged fuel filter; repair or replace faulty turbocharger; clean obstructed intercooler; replace intercooler if cooling efficiency is compromised.