Toyota 7FGCU30:
stalls under throttle

Hello everyone. I have a 7fgcu30 serial number 69449 lpg powered engine with electronic throttle. The unit will start and run fine but when you put it in gear and accelerate it stalls. After checking things over I found that I am losing power to the distributor (black and orange wire) and after it stalls with the key still on It has no throttle movement. The check engine light was on and I repaired wiring to the map and coolant temp sensors, the check engine and sas lights are both off. With the key on you can gear the throttle motor making noise and vibrating a bit without pressing the accelerator. Any ideas or help would be greatly appreciate. What confuses me is the dist losing power and the throttle not responding. Please help!
Thank you in advance.
Shane
  • Posted 23 Oct 2013 11:44
  • Discussion started by shaner
  • British Columbia, Canada
Showing items 1 - 5 of 5 results.
Changed the regulator and distributor. Now the red light next to the check engine light(pic of engine with piston) is flashing me a code 8. The unit will drive only under light throttle and stalls anything more than that.
  • Posted 24 Oct 2013 08:53
  • Reply by shaner
  • British Columbia, Canada
If you are leaving the ignition key on....with the engine OFF....while you are checking the Black with orange trace wire feeding the distributor........you may simply be seeing that the engine shutdown system is being invoked because it has not detected oil pressure within about 10 seconds after the key is turned on.
The engine shutdown system will shut off the current to the distributor if it senses a rise of engine temperature or a loss of oil pressure.
The shutdown system has a 10 second timer that allows you to start the engine despite the fact that there is no oil pressure when cranking is begun. After 10 seconds without an OK (oil sender switch OPENS) that oil pressure is present, the system will interrupt the distributor feed and the engine dies.
You can defeat this by unplugging the oil sender wire to see if THAT is why you lose distributor feed current.
The loss of the distributor feed may not be related to the other problem, and can easily be determined by unplugging the oil sender wire.
On the "flip side" of this, an oil sender wire that has become grounded (or shorted) will keep shutting the engine down (and the oil light burning if the bulb is good) until the short is fixed.
The shutdown system can still shut down the engine even if the oil light, or the overheat light bulbs are defective.
So check that your oil light works on the monitor and then see if your distributor wire stays energized with the oil sender wire unplugged. If it stays energized, that is not part of your original issue.
  • Posted 24 Oct 2013 01:30
  • Modified 24 Oct 2013 01:32 by poster
  • Reply by L1ftmech
  • Tennessee, United States
The drive by wire system requires input from the tach sensor inside the distributor to keep the throttle system working. If you lose that signal, you lose throttle action.

These trucks are a wiring nightmare- my guess is that you have a partially broken wire inside it's casing.
  • Posted 24 Oct 2013 00:30
  • Reply by bbforks
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!
Would a faulty coil cause it to loose power on the black and orange wire going to the distributor? (Would the computer detect a prob and shut it off?) When I supply 12volts to that wire the engine will run all day just no throttle after a minute or two. What is lps? I dont have a lot of experience with these.
  • Posted 24 Oct 2013 00:29
  • Reply by shaner
  • British Columbia, Canada
Hello shaner,
the electronic fuel system can be a nightmare. my only advice ( form experience) is to check the coil inside the distributor install new ignition kit. Install a new LPG converter and/or kits. The system is very sensitive. it must have the right amount of fuel to the carburetor to run properly. Less is more. If you have repaired wiring make sure you have good conductivity in the wire. Just curious is this an LPS truck?
  • Posted 23 Oct 2013 23:16
  • Reply by Prentice
  • Ontario, Canada

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