What Causes the Abnormal Noise When Releasing the Throttle in Traffic Jams?

[McEllie]

When releasing the throttle in traffic jams, abnormal noise may be caused by excessive valve clearance, excessive clearance between the tappet and its guide hole, cam profile wear, excessive clearance between the valve stem and its guide, or stuck valves that cannot close, among other reasons. Below are the specific details: Noise disappears when accelerating or pressing the throttle: If the noise disappears when accelerating or pressing the throttle, the first step is to check whether the belt is aging or adjusted too loosely. If the belt is too loose, readjust it and retry. Additionally, inspect whether there is any dragging condition with the chassis components, or if the engine guard plate is deformed and interfering with the exhaust pipe. Abnormal noise when pressing the throttle: If there is abnormal noise when pressing the throttle, it may be due to the engine belt becoming loose. A slipping belt can cause a hissing sound, and friction can also generate high temperatures. As the belt stretches further, the slipping becomes more severe, creating a vicious cycle. In such cases, it is necessary to visit a repair shop to adjust the belt, and consider replacing it if needed.

[OMaya]

When I hear strange noises after releasing the throttle in traffic jams, it's usually due to minor system issues at low speeds. My experience tells me the most common cause is excessive carbon buildup on the throttle valve or intake flap near the accelerator - when releasing the throttle, restricted airflow causes vibration noises. Another possibility is loose suspension components, such as worn shock absorbers or bushings, creating metal friction sounds during stop-and-go movements. Brake systems are another frequent culprit - brake pads not fully disengaging from rotors can produce grinding noises at low speeds, especially during transitions between braking and accelerating. I recall my car once had this issue, which turned out to be unstable engine idle caused by severely worn spark plugs transmitting vibrations to the cabin. In such situations, I typically first check if the belt tensioner pulley is loose (producing a "clunking" sound). If DIY isn't your thing, visiting a repair shop early for diagnostic scanning can prevent minor issues from escalating into major driving hazards.

[MelanieMarie]

Every time I release the throttle in traffic and hear abnormal noises, as someone who enjoys DIY, I first check if the throttle position sensor is faulty. An inaccurate sensor can cause erratic engine idling, especially in automatic transmission cars, where poor coordination between the transmission and engine can produce clicking sounds. Next, I inspect for air intake leaks—poorly sealed connections can cause hissing noises due to misaligned air intake. Also, don’t overlook the belt system; a worn tensioner or a cracked alternator belt can squeak during RPM changes. Once, while working on a friend’s old car, I found loose suspension links to be the main culprit, with metal parts clashing at low speeds. My advice: first, try to pinpoint the noise location. If it’s coming from the chassis, it’s likely a suspension issue; if it’s near the engine, carbon buildup might be the cause. Regularly cleaning the throttle body can prevent many minor issues, but for complex problems, you’ll need diagnostic tools.

[ChristopherFitz]

Abnormal noises when releasing the throttle in traffic jams are no small matter. In my opinion, they pose a safety threat. It could be due to abnormal transmission control module operation, causing delayed gear shifts and resulting in jerking sounds. Alternatively, the brake caliper might be sticking, failing to fully retract after release and creating friction noise. Worse yet, it could indicate fatigued or broken suspension springs, producing creaking sounds at low speeds and increasing the risk of losing control. Upon noticing this, I immediately stopped to inspect the vehicle. If the noise persists, calling a tow truck is advisable. These abnormal noises often become noticeable at low speeds due to significant load variations. It's recommended to develop a habit of gentle acceleration to reduce stress on components. Annual chassis maintenance can prevent most such issues.

[AlessandraDella]

From a cost-saving perspective, when my car makes strange noises when releasing the throttle in traffic jams, I suspect minor issues like a dirty throttle body or aging suspension bushings. Worn rubber bushings cause parts to loosen and vibrate, creating noise—replacing them costs just a few dozen yuan. Carbon buildup in the throttle body leads to unstable idling and a 'clicking' sound, which can be fixed by spraying cleaner yourself. However, if the noise is from a broken belt, spending a hundred yuan to replace it prevents greater losses. I recall loose wheel bolts causing similar issues, with frequent starts in traffic worsening the noise. It's wise to invest in DIY tools to check minor problems early, rather than waiting for major breakdowns. After parking, gently push the wheels to check for looseness—this saves both money and time.

[JosephLynn]

In frequent stop-and-go traffic scenarios, unusual noises may be related to the engine or exhaust system. I've experienced it originating from a "whooshing" sound due to an intake pipe leak, or vibrations from the tailpipe caused by a faulty oxygen sensor. The torque converter in automatic transmissions slipping at low speeds, producing a whining sound, is particularly common. Worn-out suspension control arm bushings rubbing on bumpy roads can amplify noise during traffic jams. Developing a habit of smooth driving, avoiding sudden stops and accelerations, can prolong component lifespan. Regularly replacing spark plugs prevents idle instability—these small things add up to affect the driving experience. I remember one repair session that resolved my car's unusual noises, making it much quieter overall.