Discussion:
Slow idle at startup then surges up to normal idle

Hi everyone, I am hoping that someone may be able to help me out on a problem with my truck.
I have a Mitsubishi FGC25K with a FG63 engine on LP.
When I came into this truck it had a blown head gasket. I did the repair on that, and now have another issue that arose after I put it all back together.
When I start the engine it idles very slowly, almost as if it is going to die out, then surges up in RPM, then drops off to its normal idle. I took a video of the problem so that there is an audio element to my question.
Any ideas where to start with this? The engine did not do this until I did the head gasket repair.
Thank you in advance for any help.
Here is the link to the video:

https://youtu.be/YPB2E9y9CYc

Chris
  • Posted 23 Apr 2020 23:23
  • Modified 24 Apr 2020 06:16 by poster
  • By Chris_Kladky
  • joined 23 Apr'20 - 1 message
  • Oklahoma, United States

Post your Reply

Forkliftaction accepts no responsibility for forum content and requires forum participants to adhere to our rules of conduct. Click here for more information.

If you are having trouble using the Discussion Forums, please contact us for help.

SMV (Konecranes) 4632CC5
Balling, Denmark
New - Sale
Komatsu FD25T17
Braeside, Melbourne, Victoria, Australia
Hire

PREMIUM business

VETTER Industrie GmbH
The world's most comprehensive range of forks and the most intelligent sensor fork for more safety and efficiency.
Movers & Shakers
Alex Dicke Alex Dicke
Senior vice president, Crown Equipment
Sales vice president, idealworks
Head of trade policy, Logistics UK
Chief operating officer, Bulldog Battery Corporation
SMV (Konecranes) 4632CC5
Balling, Denmark
New - Sale
Komatsu FD25T17
Braeside, Melbourne, Victoria, Australia
Hire
Upcoming industry events …
March 18-19, 2026 - Birmingham, United Kingdom
April 14-16, 2026 - São Paulo, Brazil
June 23, 2026 - Chicago, United States
Fact of the week
In the UK, an old building standard called the "21-metre rule" is still used to protect privacy between neighbouring properties. The 21m (or 70 ft.) was set by urban designers Unwin and Parker in 1902. They derived this distance by walking away from each other in a field until they could no longer see each other's nipples through their shirts.