What causes high idle speed in Zhijun cars?
3 Answers
The reasons for high idle speed in Zhijun cars may include air intake system leaks, fuel injector dripping or clogging, etc. Specific causes and solutions are as follows: Air intake system leaks: Under normal circumstances, the air intake must be strictly limited. If there is a leak in the intake pipe, the air flow sensor cannot accurately measure the real intake volume, causing the electronic control unit to inaccurately control the air intake and resulting in unstable idle speed. Solution: Re-seal or replace the relevant components. Fuel injector dripping or clogging: If the fuel injector drips or is clogged, it cannot spray fuel as instructed by the electronic control unit, leading to an overly rich or lean air-fuel mixture, poor operation of individual cylinders, and unstable idle speed. Solution: Measure the fuel injector's spray volume and address the issue.
I've encountered the issue of high idle speed with the Zhijun before, mostly due to accumulated oil sludge and debris in the throttle body restricting airflow. The engine should maintain low RPM at idle, but dirt can trick the ECU into thinking more air is needed, causing the revs to rise. Another common culprit is leaks in the intake system's vacuum hoses or rubber tubes—tiny cracks from aging that suck in extra air, overwhelming the computer's control and raising RPM. A stuck or faulty idle control valve directly causes loss of regulation, especially noticeable during cold starts in winter. The throttle position sensor could also be malfunctioning, sending inaccurate signals that confuse the ECU. I recommend first checking if the air filter is dirty or clogged and cleaning the throttle body. If that doesn't help, use a diagnostic tool to read trouble codes and pinpoint the root cause, since high idle not only annoys but also wastes fuel and harms the engine—fix it promptly.
As a Zhijun owner, I've also experienced the frustration of the idle speed suddenly surging to over a thousand RPM, with the roaring noise driving me crazy. Later, a mechanic diagnosed it as a clogged or burnt-out idle control valve. This component regulates the air intake, and if it gets stuck, the engine draws too much air, causing the RPM to spike. Additionally, faulty sensors near the engine, like the mass airflow sensor or temperature sensor, can mislead the ECU into improperly adjusting the idle speed. If there's a crack in the intake hose causing an air leak, the engine might misinterpret it as increased load, leading to higher RPM. Ignoring such issues can drastically increase fuel consumption and accelerate wear. Repairs aren't too expensive—a simple cleaning can solve most problems for a few hundred yuan. Don't rush to replace major parts; try minor fixes first to see the results. It's always better than facing bigger issues down the line.
