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John Deere 455 low power at startup

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#1 Bmehaffie OFFLINE  

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Posted October 22, 2017 - 08:52 PM

John Deere 455 diesel has lower power at start up.... it starts and idles move throttle lever no change take 2-3 minutes till it changes....glow plugs ok checked and work fuel pump is checked and working fine changes pump filter and in line filter..... changes imjectors with after market ones.... what do I do next it’s getting fuel... could it be the governor or injectors??

#2 Bob White12 OFFLINE  

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Posted October 23, 2017 - 07:59 AM

maybe it just needs to get up to operating temperature. A good operation temp should be at least 180 degrees  

#3 fitzer OFFLINE  


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Posted November 04, 2017 - 11:02 AM

That's real strange. Not sure what may be wrong. I assume you've had this tractor for a while, and just started doing this?

Can't see it being all 3 injectors, unless it started doing that right after the change. Fuel filter probably wouldn't do it either, but you changed anyway, so that's good.

Kind of unlikely that its the electric fuel pump either, if it starts to run ok after warming up. Usually, when they go, it will idle, but starves at full throttle. Unless..., it's getting worn out and there's not enough pressure? Not sure off hand what pressure it's supposed to have, but best check it out.

Something else to check as a 'hail mary', is check what your throttle linkages are doing at the injection pump. Possible something is binding And sticking? Loosening up as engine temp warms up?

As I said, all of above ideas seem quite unlikely, but worth looking at.

Keep us posted if it ever gets figured out!

#4 JD318420 OFFLINE  

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Posted November 04, 2017 - 02:32 PM

No additional info, like everything OK after warm up. So either it fuel related (old fuel (microbos)) plugging pickup, throttle linkages (saw this on diesels on other forums).