Hyster H80XM:
No throttle response

Hyster H80XM. K5V2476Z 4.3L. LP having an intermittent no start problem fuel lock not turning on, also has a loss of throttle too. If I disconnect the ground from the battery for a few seconds the throttle works when engine is re started. Problem seems to occur mostly after engine is shut off then restarted but the problem has a occurred a couple of times while operating.
  • Posted 12 Nov 2021 06:51
  • Discussion started by terry_c
  • Oregon, United States
Showing items 1 - 3 of 3 results.
on top of what fish suggested i would check the power at the lockoff solenoid and make sure the power is coming on every time and voltage is good (battery volts).
If the power is good then the solenoid is probably worn to the point it is binding, there is no way to repair this so replacing the lockoff should fix that issue.

Now the throttle issue can either be the throttle body or the pedal sensor (if this truck has that setup on it). Being that it is erratic i would check the wiring and connectors, check the wires going into the throttle body and make sure they are not broken where they go into it, they are known to break there. The other thing about the throttle bodies is the internal connection on the wipers can get dirty and cause a no response issue or maybe even a bad signal making it go high rpm. Also before you get into all that make sure the frame ground is good, clean it if need be, if there is paint under the terminal on the frame scrape it off to bare metal.

Now with all that said you can do a diagnostic using the 4pin diagnostic plug, it will have each terminal labeled A B C and D, you can use a jumper and jump the A and B terminals to enable the diagnostic mode. When you start that the engine light will flash a code 12 three times, then a pause then it will start flashing any stored/active codes in memory. If you're not familiar with this diagnostic test i can send you some info on how that works, just use my email in my signature. You'll want to know if there are any codes before you get too far into it.
  • Posted 12 Dec 2021 17:18
  • Modified 12 Dec 2021 17:19 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Terry,

The 4.3 on this model get a bit touchy at this age. Multiple wiring issues, possible throttle failure. When removing the ground wire, the throttle must relearn the sweep. Sounds like you have issues with either the TPS or governor. Also, 4.3 are known for failed spark plugs, wires, cap and rotor. Completing a tune up will go along ways. Good luck.
  • Posted 11 Dec 2021 07:04
  • Reply by Fishmech
  • Virginia, United States
The hard to do we do right away. The impossible just takes a little longer.
Also a couple of times with the engine idling, the rpm raise to about 2500 and stay there till the battery is disconnected and reconnected
  • Posted 12 Nov 2021 07:06
  • Reply by terry_c
  • Oregon, United States

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