What Causes Abnormal Noises in the Chassis When Starting the Vehicle?
2 Answers
Reasons for abnormal noises in the chassis when starting the vehicle: 1. The internal gears of the starter become stiff or stuck, causing: (1) The starter rotates, driving the flywheel to rotate and start the engine. At this point, the engine speed is driven by the starter, so the engine speed is lower than the starter speed. (2) When the engine speed after starting exceeds the starter speed, manually operate the ignition switch to cut off the power and turn off the starter. (3) Due to excessive dirt inside the starter and ineffective lubrication, the flywheel engine drives the starter to operate at its own speed. (4) Due to the speed difference between the two, the starter will produce abnormal noises. When the starter and engine are in a hot state, this noise will cease, but each severe start will still produce noise. 2. Clutch malfunction: If there is an issue with the clutch, a clunking noise may occur when the car starts.
Last time I worked on my car, I encountered a strange noise from the chassis as soon as I started it. It was probably due to worn-out bushings in the suspension system or a loose stabilizer bar—that annoying creaking sound was really irritating. It could also be that the half-shaft connecting components have aged, and frequent driving on bumpy roads accelerates the wear. You should first find a flat spot to park the car securely, then crawl under the chassis to check if any screws are loose or parts are rusted. Buying a set of tools yourself might allow you to tighten them and test it out. However, for safety reasons, it’s best to take it to a professional shop for repairs, as chassis issues can affect driving balance, and steering failure could be dangerous. I recommend regular lubrication and rust prevention to extend its lifespan, saving you the cost of major repairs later.
