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

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  #21  
Old 11-24-2009, 07:32 PM
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Originally Posted by DieselDanBoy View Post
alright it sounds like your on the right track but still something doesnt seem quite right to me.

Im deffinetly with you on the fuel issue but you said it was at about 2400 rpm and it wasn't pulling worth a crap and egt's were low.

Now im not a cummins guy but if the motor's running at 2400, it should be getting good fuel no?? im not doubting you guys im just really interested
well the 12v's start defueling after 2100 rpm (someone correct me if im wrong) so the only way to correct that is a new fuel pate.
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  #22  
Old 11-25-2009, 07:36 AM
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A fuel plate won't help with the defueling. That is controlled by the govenor. You'll need a GSK kit.
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  #23  
Old 11-26-2009, 09:55 AM
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the boost was reading 26 lbs, rpm's were around 2,400 and the weird thing was that my egt's were only at 600?
The numbers sound right to me for 12V that is running a stock fuel plate. I think the motor is producing the power but the tranny is not delivering it to the pavement.
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  #24  
Old 11-26-2009, 10:35 AM
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My 12v will get up to 2400 no problem but the fuel pressure drops to almost nothing, well below 10psi on my gauge. So yes it has fuel but not necessarily enough fuel.
Put a fuel gauge on it, I was amazed my truck was still running when I saw what the psi was.
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Originally Posted by DieselDanBoy View Post
Now im not a cummins guy but if the motor's running at 2400, it should be getting good fuel no?? im not doubting you guys im just really interested
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  #25  
Old 11-27-2009, 06:29 AM
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sounds like a tranny problem because he said it was at about 2400 rpms and only going 20 mph, the engine might not have had the power but it was turning enough rpms. and if the engine has no load on it then its not goona have a whole lot of heat in it. sounds to me like the torque converter is toast. either that or the valve body didnt let it shift to the next gear so it could go on. jmo
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  #26  
Old 11-27-2009, 12:41 PM
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Then shouldn't it have cooked the tranny fluid.
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  #27  
Old 11-27-2009, 10:58 PM
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smell the tranny fluid to see if it smells like burnt toast, then pull the tranny pan and see how much debris is in the bottom. with those rpms and only going 20mph that fluid should be a stinking bad!!!!!!!!!
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  #28  
Old 11-28-2009, 01:27 AM
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The combination of very low EGT's and he said the tranny fluid is still fine is why I said it's gotta be fueling issues.
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  #29  
Old 11-29-2009, 09:51 AM
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Quote:
Originally Posted by 12.valve.hauler View Post
sounds like a tranny problem because he said it was at about 2400 rpms and only going 20 mph, the engine might not have had the power but it was turning enough rpms. and if the engine has no load on it then its not goona have a whole lot of heat in it. sounds to me like the torque converter is toast. either that or the valve body didnt let it shift to the next gear so it could go on. jmo
i like this answer the best, low egt's mean that either there's not a huge load on the engine, or insufficient fuel. but even at 2400 rpm the truck should still slowly pick up speed, once it came off the hill did the problem go away or no?
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  #30  
Old 12-07-2009, 04:37 PM
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about your 12v with no power pulling i would do a built trans i went the cheap route at first and broke my imput shaft but i now have a full builet trans with all three shafts converter and valve body flex plate and lock up controler the lock up is the big deal because the early years have a gruonding issue and wont lock up thats what mine was doing and before it you could not pull anything but it gets pricey for a good trans
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