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

weird

Old Nov 3, 2008 | 11:02 AM
  #11  
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Mine too... You're idle is way low... Should be around 800, give or take a hundred. I still think its an injector.
 
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Old Nov 3, 2008 | 11:48 PM
  #12  
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i will crank it up and see how it behaves. the motor is fine once it runs it just has been making me go through 2 - 5 cycles to fire
 
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Old Nov 4, 2008 | 08:11 AM
  #13  
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Same with mine, occasionally some injectors with a lot of miles won't hold prime and they'll leak down into the cylinder, makes startups hard.
 
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Old Nov 5, 2008 | 08:20 AM
  #14  
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thats what has me weirded out. itts only got 113K and its acting up
 
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Old Nov 5, 2008 | 09:25 AM
  #15  
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Bump the idle up a bit for winter. 100-200 rpm.
That, or feather the pedal for a min or two at start-up.
This is very common for these trucks/motors.
 
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Old Nov 5, 2008 | 05:14 PM
  #16  
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I am noticing that if it sets for 6 hours or so itwill not start well at all. if I run in to a store and come right back out it sarts up great. i think I may have a loss of prime some where like McCall said. I hope its nothing expensive!
 
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Old Nov 5, 2008 | 07:23 PM
  #17  
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I had the same problem with my truck, and after reading this post, I went and adjusted my idle and now no problem!
 
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Old Nov 7, 2008 | 08:17 AM
  #18  
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i guess that it could not hurt anything.
 
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Old Nov 10, 2008 | 04:55 PM
  #19  
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OK i turned up the idle. it still does not fire up right I sat for over five minustes trying to get it to turn over. does anyone know where the valves are that stop the diesel from going back out of the lines. I have no raw diesel pop at first crank which makes me think its not a leaking injector. Im freaking out guys
 
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Old Nov 11, 2008 | 10:01 AM
  #20  
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Overflow valve could be leaking down... I gotta do mine too. Could be a leak at the pre-heater bowl where the wiring harness plugs in. Could be a leak in your lift pump. Could be a crack in the lines, although it'd probably stall out on you if it was.

I don't know where mines coming from either, but I really don't care at this point, it still fires up in the morning, just takes a little while. The 98 starts right up no matter how long its been sitting... Weird.
 
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