Why Does The Engine “Hunt” Or “Surge” At Idle Or Low Speeds?

Hey there, I'm Tom, a long-time truck enthusiast. Recently, my truck's engine has been acting strangely at idle and low speeds. It seems to "hunt" or "surge" instead of running smoothly. This irregular fluctuation is becoming quite bothersome, especially during city drives where slow speed is common. I've tried to troubleshoot it myself, but couldn't pinpoint the exact cause. Can any experts out there help me understand why my truck might be behaving this way? I'd greatly appreciate your expert advice. Thanks!
Solved By Zoe Cheng

Solved By Zoe Cheng

Zoe Cheng is an expert in the diesel engine and parts. The company Sennoparts is officially authorized by DEUTZ and VOLVO to sell and service original diesel and machinery parts. We also sell high quality replacement parts and offer remote repair assistance service. Our company exports to over 30 countries worldwide and we have partners in Kenya, Philippines and Uganda among others.

Hi Tom,

Engine “hunting” or “surging” at idle or low speeds can be caused by various factors. A common culprit could be a vacuum leak or an issue with the idle air control valve. The vacuum leak can cause an imbalance in the air-fuel mixture, leading to unstable engine idling. Similarly, if the idle air control valve, which manages the engine’s idle speed, is malfunctioning, it could lead to surging.

Another potential cause could be issues with the fuel delivery system. If there’s a problem with the fuel pump, injectors, or filter, it could result in an inconsistent fuel supply, causing the engine to surge.

It might be best for you to take your truck to a professional mechanic to accurately diagnose and address this issue. Stay safe on the roads, Tom!

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