Caterpillar GC25K OR GP25K:
EXTREEM IDLE

WE HAVE A 2003 CAT FORKLIFT WITH A PROPANE RUN MITS 2.0 ENGINE. WE WERE USING IT AND THE IDLE WENT THRU THE ROOF.
T.P.S. TEST GOOD AND NO VACCUUM LEAKS. IF I CLOSE OFF THE AIR INTAKE IT WILL STALL. THE DIAPHRAM IN THE MIXER GAS BEEN REPLACED. AND THE PRESSURE REG HAS BEEN REBUILT. STARTS NO PROBLEM BUT IDLE IS WAY TOO HIGH
  • Posted 27 Nov 2014 04:06
  • Discussion started by AUTOGUY
  • Florida, United States
Showing items 1 - 7 of 7 results.
thanks admin :o)
he got in contact with me and we're all set
  • Posted 14 Mar 2020 12:56
  • Modified 14 Mar 2020 12:58 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
chevysilverado at sbcglobal dot net
Posted 14 Mar 2020 05:05
  • Admin
  • Posted 14 Mar 2020 12:30
  • Reply by Admin
  • Queensland, Australia
Contact me about any forum administration issues.
hey scott
forum blocked your email from posting in the body of the message
you can add it to your profile signature or you can just email me @gmail
  • Posted 14 Mar 2020 05:17
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Can you email me that info
At chevysilverado at sbcglobal dot net
  • Posted 14 Mar 2020 05:05
  • Modified 14 Mar 2020 12:29 by administrator
  • Reply by Scottt_Breer
  • California, United States
Scott2533
Chevysilverado@sbcglobal.net
yeah that 'electric box' you speak of is actually the throttle body control... it has gears in it and a servo that the TPS sends signals to to tell it where to position itself according to where the pedal is.
What i've seen in the past was the inside where the servo and gears are tend to dry out, the grease drys up and it starts sticking or hangs up a little bit. Or the wires break at the plug or just inside the box.

If you had the MCFA diagnostic software you could plug into it and monitor the voltages at the TPS and make sure it's set correctly. If you have adjusted on it any that may be why the idle is so high. Just remember though, if it gets too far out of range it will not rev up at all and put the engine in limp mode till it gets set where it's supposed to be.

plus that serial number is incorrect
i believe it should be AT82D02751 :o)

the fuel system on that truck should be the SG15 Carb1 Tier1 system. I do have some papers on how to check that throttle body and accelerator and a few other things.
email addy?
  • Posted 27 Nov 2014 09:51
  • Modified 27 Nov 2014 10:03 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
s n # at82002751
checked the throttle blade. working well no sticking at all. good spring tension. I then unplugged the elect. box under the throttle body it starts runs at low idle but of course will not accellerate
  • Posted 27 Nov 2014 05:57
  • Modified 27 Nov 2014 06:03 by poster
  • Reply by AUTOGUY
  • Florida, United States
Serial?
Try cleaning the throttle plate area it might be gummed up.
Worse case is the TB gears might be hanging up and not returning to rest when at idle position.
  • Posted 27 Nov 2014 04:58
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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