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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
  • By Daryl_Gulledge
  • joined 9 Feb'22 - 2 messages
  • Georgia, United States
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Showing items 1 - 4 of 4 results.
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
  • By Scott_
  • joined 16 May'21 - 318 messages
  • 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
  • By Daryl_Gulledge
  • joined 9 Feb'22 - 2 messages
  • 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
  • By Scott_
  • joined 16 May'21 - 318 messages
  • Pennsylvania, United States
Scott
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A failing velocity govenor?
  • Posted 11 Feb 2022 11:12
  • By ForklifttSteve
  • joined 13 Nov'19 - 30 messages
  • Mississippi, United States
Steve Pierce
Coast Equipment Services
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