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What causes unstable idle speed fluctuation in the Benelli TNT 600?

2 Answers

LincolnLee

07/24/25 4:59pm

The reasons for unstable idle speed fluctuation in the Benelli TNT 600 may include intake manifold or intake valve leakage, throttle valve or idle air control valve sticking, and inaccurate air intake volume. Details are as follows: Intake manifold or intake valve leakage causing unstable idle: When unauthorized air, exhaust gas, or fuel vapor enters the intake manifold, it causes the air-fuel mixture to become too rich or too lean, resulting in abnormal engine combustion. Solution: Replace the leaking intake manifold. Throttle valve or idle air control valve sticking: A dirty throttle valve reduces the intake cross-sectional area or causes the throttle valve to stick, preventing the control unit from precisely regulating idle air intake, leading to unstable idle speed. Some vehicles use an idle air control valve to manage idle air intake. During idle, air passes through the idle air control valve. Excessive carbon buildup can cause insufficient or excessive air intake, resulting in unstable idle. Solution: Clean the throttle valve.

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DeNorah

08/11/25 9:24am

I usually ride my Benelli TNT 600 to commute, and when the idle speed becomes unstable, fluctuating up and down, the most common cause is excessive carbon buildup in the throttle body. Over time, sludge can block the throttle opening, affecting the air intake and causing the RPM to fluctuate. I’ve cleaned it myself a few times: removing the throttle body and spraying it with cleaner—simple and effective. A clogged air filter can also cause this issue; when it’s dirty, the engine doesn’t get enough air, so try replacing it with a new one. Additionally, vacuum hose leaks are quite common—if the hose ages and cracks, it can draw in extra air, leading to erratic idle speeds. A poorly calibrated ECU might also be the culprit, but I avoid tampering with electronic components for fear of causing damage. Whenever I notice unstable idle speed, I stop immediately to check, avoiding the risk of a breakdown on the road. Regular maintenance is the best prevention—clean every 5,000 kilometers. If carbon buildup is severe, the fuel injectors should also be checked; if they’re clogged, uneven fuel delivery can make idle speed even harder to stabilize.

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