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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 - 306 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 - 306 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 - 28 messages
  • Mississippi, United States
Steve Pierce
Coast Equipment Services
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"Toyota 8FGCU30:Backfiring - Thanks Scott_ from Pennsylvania. Normally most backfire problems come from some problem with the ignition system l would check..."
Scott_, United States
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Fact of the week
Bluetooth is named after the 10th-century Viking king, Harald Bluetooth, who united warring tribes in Denmark and Norway. In 1997, Jim Kardach from Intel gave the name to the technology because of its ability to unite different communication protocols, just as Harald united various tribes.