jimmy47785 Posted March 30 Share Posted March 30 Greetings, everybody! What may be the cause of the fluctuating or surging RPMs I am experiencing? While in park, the revolutions per minute (rpm) fluctuate, and I can perceive the automobiles' sounds altering in tandem with the rpm changes. Video: Additionally, I am experiencing a bothersome whining noise upon cold starting the vehicle, which diminishes as the car becomes warmer. Despite my efforts to replace the PS oil with fresh oil and bleeding the system, the whining sound persists. Video: Quote Link to comment Share on other sites More sharing options...
DSM10000 Posted March 30 Share Posted March 30 What kind of automobile? The videos are not accessible. Personally, for me. Quote Link to comment Share on other sites More sharing options...
bvlenci Posted March 30 Share Posted March 30 The idle spark plugs should be checked for proper gaps or replaced and subsequently inspected, along with the coil packs. I would begin with the plugs and proceed thereafter. Quote Link to comment Share on other sites More sharing options...
jimmy47785 Posted March 30 Author Share Posted March 30 Apologies for neglecting to specify the model of my automobile. The model is a 2012 C63 AMG W204. Quote Link to comment Share on other sites More sharing options...
jimmy47785 Posted March 30 Author Share Posted March 30 The plugs, coils, and gaped have been replaced.040 The idle spike persists.v Quote Link to comment Share on other sites More sharing options...
Howard_silver Posted March 30 Share Posted March 30 Is there a vacuum leak originating from the intake hoses? Quote Link to comment Share on other sites More sharing options...
clk320x4 Posted March 30 Share Posted March 30 +1. Upon hearing the OP's remark of increasing RPM, it was my first response. Quote Link to comment Share on other sites More sharing options...
Trevorseaf Posted March 30 Share Posted March 30 I had a similar issue and attributed it to the jamming of the MOT evap valve. Quote Link to comment Share on other sites More sharing options...
Howard_silver Posted March 30 Share Posted March 30 Over time, intake pipes become rigid and fragile, causing them to lose their grip and perhaps leading to an increase in RPM. Quote Link to comment Share on other sites More sharing options...
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