12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

is it just my truck?

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Old Sep 3, 2013 | 06:15 PM
  #1  
olsmokey's Avatar
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Default is it just my truck?

Ever since I bought my 12v I have had to give it throttle every time I fire it up. Not much just a hair. But its every single time I start the truck. No throttle it just cranks and cranks. Is this typical or is something bunged up?
 
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Old Sep 3, 2013 | 10:00 PM
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your idle is too low ...... when running in D ( have some one hold the breaks W a/c on if you have it ) should run about 8-850 ish ... any lower and when cold it wont start or will be a real BI%^$ when it does start .... also check your fuel filters and your return line restricter thinggy .... cant remember the name ..... AAHHHH ....... check fuel pressure at any rate ...LOL
 
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Old Sep 4, 2013 | 05:22 AM
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the idle adjustment is actually the start fuel adjustment. what people are doing by messing with the idle is lowering the CC's of fuel the pump allows @ cranking rpms. if its to low the result is having to give it a little throttle to get the pump pumping an adiquite amount of fuel to fire. a 12v should pop of and run almost immediately.
 
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Old Sep 4, 2013 | 04:22 PM
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Sounds like something is wrong, but you're supposed to give it gas anyway. My owner's manual says to crack the throttle when you crank it. It'll still start if I don't, but nowhere near as quickly. Unless you've replaced your mechanical lift pump for an electric one, you aren't getting any prime if you don't give it some gas.
 
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Old Sep 4, 2013 | 04:36 PM
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Mine has stock everything for now ........ fires right up ....

---AutoMerged DoublePost---

I would check ur fuel pressure hot and cold .... see if there is a difference ...... idle, wot, and then drive it a bit ...... letit set till morning ..... check it right at the attempt to start ........ betting ur Iidle is most likley messed up ....
 

Last edited by 4x4manonbroke; Sep 4, 2013 at 04:36 PM. Reason: Automerged Doublepost
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Old Sep 4, 2013 | 05:22 PM
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mine idles in drive, with ac on, at like 500rpms?.. is that too low.. ive always had to give it some skinny pedal never thought something was wrong?
 
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Old Sep 4, 2013 | 05:24 PM
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Not if you like it there, but yeah, that's lower than most.
 
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Old Sep 4, 2013 | 05:30 PM
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truck runs perfect.. guys were starting to scare me with this 850-900 stuff..
does need a new oil pressure sending unit though. my oil pressure is more up and down then martin on his pillow. (;
 
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Old Sep 4, 2013 | 06:03 PM
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Originally Posted by CR9712v
mine idles in drive, with ac on, at like 500rpms?.. is that too low.. ive always had to give it some skinny pedal never thought something was wrong?
yes thats too low. you will have 2 issues. the truck will stall when cold and you will have to give it throttle to start because the rack is all the way back and not delivering fuel like previously stated.
 
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Old Sep 4, 2013 | 07:02 PM
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so loosen the lock nut at the bottom, then spin the top nut counter clockwise to tighten her up, then tighten the lock nut.. right?
 
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