Truck rpms jumping when i start - Ford Powerstroke Diesel Forum
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  #1  
Old 08-30-2008, 01:42 PM
Skeet
 

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Truck rpms jumping when i start

when i start my truck sometimes it lopes like its tries to die to low rpms... it just jumps up and down... sometimes it'll do it 2 or 3 times sometimes it'll do it untill i rev up the engine... it clears once i rev up... and only does it when i start the truck not when i stop or idle... doesn't matter weather its first start of the morning or weather its been run all day it does it randomly.... 97f-350 psd
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  #2  
Old 08-30-2008, 01:58 PM
Jon
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First thing I can think of is get the codes checked. But I would say that it sounds like an IPR that is wanting to stick sometimes. Also if your truck is an auto I learned from Scuffy that the trans range sensor can intermitently do that.
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Old 08-30-2008, 02:07 PM
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what about fuel pressure? can it be low at start up?
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Old 08-30-2008, 02:15 PM
Skeet
 

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thats gotta be it then cuz I do have a code on my range sensor or neutrel idle switch .... saying high output... i replaced the neutral idle switch on the side of the tranny.... but still same problem... ... so where to next
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Old 08-30-2008, 04:54 PM
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It could be oil leaking back down from the HPOP resevoir and it takes a bit for it to fill back up.
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Old 08-30-2008, 04:58 PM
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that could be it also.
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