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

got a bad hi/low idel miss, any ideas???

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Old 11-09-2008, 01:26 AM
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Default got a bad hi/low idel miss, any ideas???

ok installed 4k springs and thats fine starts up but has a roufgh idel and an even roufgher hi idel runs like crap and sounds like it has a miss and popping sound, could it be a bad injectors? afc is slid full foward, 100 fuel plate, just started after installing springs, am i on the rite trac??? could somebody please call me if youve gone thru this thanks guys, also truck sat for about a week then i installed the spring kit and poof problems, springs are set at about .060 clerance from stud top to retainer nut,if ya can help give me a call please 832-493 2054 thanks guys

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Old 11-09-2008, 01:51 AM
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Stiffer springs may have caused a lifter to collapse. One way you can tell is remove all the rocker covers, start it up and look for a rocker that is hardly moving or isn't moving period compared to the rest of them.
 
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Old 11-09-2008, 09:47 AM
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i thought that they were solid lifters??? on my model year
 
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Old 11-09-2008, 09:51 AM
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They could be, I was only taking a guess. I'd pull the rocker covers to make sure all the rockers are moving.
 
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Old 11-09-2008, 05:14 PM
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Lossened the injector lines at the pump and bled air out but had no change and have a lite haze of white smoke, could maybe use some new sticks??? gonna pull them out and get em pop tested i guess, any ideas
 
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Old 11-09-2008, 05:53 PM
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Didn't see a white haze issue earlier. Is it's what's going on, go an injector that isn't atomizing fuel correctly, or is washed out.
 
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Old 11-09-2008, 09:28 PM
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yup just noticed it earlier after i cleaned out the screen on the filter heater, and drilled and tapped the banjo and installed a pressure gauge, fuel pressure is good, blead all lines and walked around the truck and noticed a very very lite white haze, so i started cracking lines and had no affect on run idel when i cracked open #5 so thats is where i will start is a pop test, or just a good excuse to get new inlectors,
 
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Old 12-18-2008, 10:13 AM
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Default idle issues?

Gone ropin, my first question is if you took the pump off to install the spring or you did it with it installed on the engine. Second if you replaced all of the springs or did you leave the big one installed with the new ones.
 
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Old 12-18-2008, 04:02 PM
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I say if it was fine before you installed the gov springs. then started acting up after you put them in. There was something done wrong. changing the springs would not just make an injector go bad. tear it back down make sure you done everything right.
 
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Old 12-18-2008, 06:18 PM
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double check your setup on the springs. from what i have heard, if the one set of springs is tighter than the other set it can cause this kind of thing.


BTW, they are solid lifters, if you collapse one you have some serious issues!
 



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