What are the reasons for the loud idle sound in the Equinox?
2 Answers
The reasons for the loud idle sound in the Equinox may include piston slap, timing gear wear, and piston pin guide noise. Piston Slap: Piston slap is a common source of abnormal noise. Due to poor lubrication conditions, excessive wear occurs between the piston and cylinder wall, causing the clearance fit tolerance between them to exceed the normal range. When the engine is running, the piston skirt impacts the cylinder wall, producing a clear "clanging" sound, which is more noticeable during idle or low-speed operation. Timing Gear Wear: After prolonged use, along with improper gear clearance adjustment and poor lubrication conditions, gears can experience excessive wear. In severe cases, the gear teeth may even become worn down, leading to loose meshing between gears. This results in a "whirring" sound when the machine is running. Piston Pin Guide Noise: Due to excessive wear of components, the clearance between the piston pin and the connecting rod bushing becomes too large. Additionally, the fit between the connecting rod bushing and the connecting rod small-end bearing becomes loose, and the clearance between the piston pin and the piston pin bore becomes excessive. This causes the piston to swing during movement, colliding with the cylinder wall and producing abnormal noise.
Excessive idle noise in the Equinox is quite common. I've encountered it several times myself, often indicating engine system issues. Firstly, it could be carbon buildup, where valves and pistons get stuck, increasing friction during operation and causing louder noise. Secondly, aging ignition systems, like untimely replaced spark plugs, can cause unstable current during idle, leading to increased engine vibration and noise. Thirdly, loose belts, especially the air conditioning compressor belt, may produce squeaking sounds at idle. Additionally, exhaust system leaks, such as loose pipe connections, can amplify noise. Excessive idle noise isn't just annoying; it might mask other fault signals, increasing fuel consumption or safety risks. I've found that regular engine cleaning and part replacements can prevent this. It's best to drive to a repair shop for a check-up to avoid minor issues turning into major problems.
