Toyota 7FGU30:
Idle Surging

This model is a late 7 series so it has the electronic throttle body like on the 8 series trucks. The problem we are having is it surges at idle. Runs fine with lots of power any other time. If you depress the throttle pedal just a little bit twisting thepotentiometer it will stop. We dont have the scan tool to check any sensor operation. Any help would be greatly appreciated. The unit starts fine and the propane converter is adjusted to start well. Thanks.
  • Posted 15 Feb 2008 06:51
  • Discussion started by wil_m
  • British Columbia, Canada
Showing items 1 - 7 of 7 results.
I read your post l would remove throttle body turn on side that opposite of throttle moter spray carb cleaner and clean butterfly plate in side it gums up and causes surging or hunting do not let spray get near moter housing hope this helps
  • Posted 16 Jan 2022 05:45
  • Reply by Scott_
  • Pennsylvania, United States
Scott
I have a similar issue in a 8 series.
If you death head it or lock the wheel the truck surges at times and will stall randomly.
We have replaced the vacuum chamber at the vaporizer and some one installed a new vaporizer also. We have tried the adjust the mix and it's at 2.5 and the 02 cycles normally.
We went as far to Install a new distributor and still doing the same thing. Other then a ecm not sure what else controls the compensates load.
Thank you.
  • Posted 14 Jan 2022 08:45
  • Reply by Dino_Tapia
  • Missouri, United States
Dino
When reading this is at first sounded like the pre LPG FLT that Toyota is using it's a 3 micron flt and clogs a lot faster an the old 10 micron flt the new flt it located to the right hand side over head guard it round and has 4 10mm bolts those have been clogging a lot on me casueing this symotom
  • Posted 4 Sep 2008 17:07
  • Modified 4 Sep 2008 17:09 by poster
  • Reply by dantheman
  • New Hampshire, United States
Glad to hear you got it fixed. Sometimes the little things cause the biggest problems. It also pays to keep looking as you did for the root to the problem.
We have several of the 7 series but I haven't had that problem yet but it will be something to watch for.
  • Posted 19 Feb 2008 08:27
  • Reply by Nash
  • Tennessee, United States
Well we seemed to have found the problem. Someone had tightened the idle mixture screw on the propane converter to tight and damaged the needle. We cleaned up the needle and everything was great. Thanks for your help.
  • Posted 19 Feb 2008 02:58
  • Reply by wil_m
  • British Columbia, Canada
THanks for the reply. There aren't any codes on the lcd display. We are sort of heading towards the TPS as well but just looking for support in our decision. We called Toyota and they want about $300 for the TPS. Iguess we'll keep digging to make sure. Thanks again.
  • Posted 15 Feb 2008 10:51
  • Reply by wil_m
  • British Columbia, Canada
Hi Wil, Is there any other lights on the dash on? Look at your hr/combination meter and see if any error codes are set. If I am not mistaken you can just turn the key on to see codes in hr meter.
Just a guess but it sounds like throttle position sensor but with out scanning hard to say.
  • Posted 15 Feb 2008 10:23
  • Reply by Nash
  • Tennessee, United States

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