Volvo S60 engine surges while idling on Volvo S60

Some Volvo S60 owners report experiencing engine surging while idling, which can be attributed to several common issues. A build-up of fuel deposits on the fly-by-wire system is often cited as a cause of rough idle and surging. Cleaning the throttle body unit may help alleviate surging or hesitation during light acceleration. Additionally, fluctuations in engine speed can occur when the throttle position sensor (TPS) detects conflicting signals from other sensors. A clogged fuel injector may also lead to erratic engine behavior, resulting in surging, stalling, and fluctuating RPMs. Owners are advised to check the Positive Crankcase Ventilation (PCV) system, as a restricted or plugged PCV nipple can contribute to idle surges. Symptoms such as the engine speed dropping below idle after highway driving, followed by surging back up, have also been reported. Furthermore, sputtering and nearly dying while idling may indicate a more severe problem that requires immediate attention. Addressing these issues through proper maintenance is essential for resolving engine surging in the Volvo S60.