Figuring out why a large diesel mining machine has a slow auto idle return

Alan · Feb 18, 2026

You’ve witnessed it, the machine comes off load, but the RPM just hangs there, taking its time before it finally drops to idle. It shouldn’t take this long! What’s the first thing you look into, is it the fuel system, throttle input, sensors, ECM settings, or hydraulics? What’s caused this issue for you before?

Goldshark · Feb 21, 2026

The reason can vary from machine to machine.

Adamms · May 15, 2026

First thing I’d check is throttle position sensor and linkage return, then look for ECM idle settings or load signal hanging from hydraulics or fuel governor not dropping cleanly.

Figuring out why a large diesel mining machine has a slow auto idle return

Alan

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Goldshark

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Adamms

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