What Causes the Zizzing Sound After Engine Startup?
2 Answers
Startup car engine has zizzing sound for the following reasons: 1. Check the belt tension. If the car belt is loose, it will produce a zizzing sound. You should have the belt inspected at a repair shop. 2. If the car has not been moved for a while, the engine oil will return to the oil pan, and the valve chamber will lack oil. Without the sealing and lubrication from the oil, you will hear a zizzing sound when the car starts. More related information is as follows: 1. An engine is a machine that can convert other forms of energy into mechanical energy. It was invented in the UK and can refer to either the power generation device or the entire machine including the power unit. 2. Types include internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines, steam engines), and electric motors.
I ran into this issue recently, and the squealing noise is most likely caused by a slipping belt. Especially during cold starts, when the belt ages and hardens, insufficient friction can produce this high-pitched noise. It could also be due to a lack of lubrication in the alternator pulley or the air conditioning compressor bearings, causing dry grinding—this kind of squealing will change pitch as you rev the engine. I recommend first using a flashlight to check if the belt has any cracks, and pressing the middle section to see if it deflects more than half a centimeter. If the belt is fine, chances are the tensioner pulley bearing is signaling trouble. If you don’t fix it soon, it might leave you stranded on the road. Better head to the repair shop early for a check-up.
