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Komatsu FG25ST-16:
RPM drop while operating

I have a komatsu that the engine rpm will drop for 1-2 second then pick back up. This repeats randomly. I have swapped accelerator pedal position sensor, injector, lock off valve vaporizer and baro sensor with all known good parts. The problem still persists. What have I missed?

• Posted 9 Feb 2022 15:25
• Discussion started by Daryl_Gulledge
• Georgia, United States

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No vacuum leaks also have you changed the etca possible gumed up or maybe the tps switches are going bad inside or throttle moter just thinking

• Posted 12 Feb 2022 00:11
• Reply by Scott_
• Pennsylvania, United States

Scott

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There are no codes. Have changed the task with known good.

• Posted 11 Feb 2022 22:50
• Reply by Daryl_Gulledge
• Georgia, United States

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I read your problem is there any codes in truck,if not l would check tps if everything checks out you might have to do a tas learn on ecm to set air fuel ratio and rpm to do this you need the hitishi 2000scanner

• Posted 11 Feb 2022 13:33
• Reply by Scott_
• Pennsylvania, United States

Scott

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A failing velocity govenor?

• Posted 11 Feb 2022 11:12
• Reply by ForklifttSteve
• Mississippi, United States

Steve Pierce
Coast Equipment Services

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