24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps
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So Who Can Solve This Mystery

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  #1  
Old 11-06-2009, 12:30 PM
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My trucks runnin fine but it's not right and we can't figure out why.

*The EGT's are runnin higher then normal.
*The Boost is runnin higher then normal at cruising speeds.
*MPG have dropped off a little bit.
*Absolutely no smoke on take off even with Drag Comp on 5X5.
*No smoke during spool up but a slight puff at the high end.

As I said the trucks runnin fine and pulls any load I hook it up to, just workin harder to do it then it used to. I just had the RV275 injectors rebuilt attempting to fix this and that had no affect.
 
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Old 11-06-2009, 02:11 PM
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is there any change when you turn the comp off? any codes?
 
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Old 11-06-2009, 02:14 PM
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How long has it been since you cleaned your IAT or Map Sensors?
 
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Old 11-06-2009, 02:17 PM
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APPS calibration? is there any residual drag that you can notice like a caliper dragging bad? fuel filters ok? fuel pressure ok? anything clogging the tailpipe like an old cat or squirrel or 4?
 
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Old 11-06-2009, 02:31 PM
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do you have a exhaust brake
 
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Old 11-06-2009, 02:37 PM
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Originally Posted by nbaca
is there any change when you turn the comp off? any codes?
Nope, I've tried different settings and nothin of any significance changes.

Once in a while I get the check engine lite and two codes pop up every time. P2037 MAP Sensor Voltage and P0602 Fueling calibration. If I clear them they stay clear for weeks at a time but come back randomly.

Originally Posted by lukesdiesel
How long has it been since you cleaned your IAT or Map Sensors?
Less then 50,000 miles ago.

Originally Posted by Benjamin
APPS calibration? is there any residual drag that you can notice like a caliper dragging bad? fuel filters ok? fuel pressure ok? anything clogging the tailpipe like an old cat or squirrel or 4?
I have re calibrated the APPS once already but I guess I need to check it again. Fuel filter is changed regularly and fuel pressure never leaves 16psi. Haven't smelled anything burnin like a squirrel in the pipe but who knows.
 
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Old 11-06-2009, 02:38 PM
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Originally Posted by diesel pap
do you have a exhaust brake
Nope, I'm to cheap.
 
  #8  
Old 11-06-2009, 02:54 PM
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not sure if this will help.

had a guy come in once claiming the same thing, we were baffled for about a month, one day we decided for some resone to take the head off, there was alot of drag on the piston from the piston rings, there was alot of carbon and suit build up that looked like that what was causing that issue, we cleaned the holes and threw in new rings, that is what cleared his problem.

hope this helps

was just thinking as well what could also cause this

bad oil temp sensor or water sensor
 

Last edited by cummins_guy; 11-06-2009 at 02:57 PM.
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Old 11-06-2009, 02:54 PM
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when the last time ya checked out yer turbo?
how the intercooler boots?
 
  #10  
Old 11-06-2009, 03:03 PM
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Check the connections for your Comp. You throwing a MAP sensor code makes me lean towards needing a new MAP.
 


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