1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

lookin for help (still)

Old Nov 14, 2010 | 01:32 PM
  #1  
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From: selinsgrove PA
Default lookin for help (still)

my 92 Dodge is still givin me trouble...The problem comes and goes truck is an automatic some times when ya put it in gear it pulls the rpms down to 550 rpms even turnin up the idle doesnt help.So far I have replaced the inj pump ,injectors, set pump timing from stock to all the way against the head. new lift pump clear hose to bypass the filter adjusted valve even checked for broken vave springs and checked valve lift with a dial indicator @ zero lash also checked with manometer checked comp on (cold motorO 310 across the board)any other thoughts
 
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Old Nov 14, 2010 | 01:36 PM
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what rpm does it idle at with truck in park.
 
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Old Nov 14, 2010 | 01:42 PM
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when the truck is workin ....in Park 800 throw it in gear it'll idle at 725 as per snap on scan tool .......when the truck isnt workin it'll drop to 500 and start luggin same problem exisits through all stages or repair diagnostics
 
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Old Nov 14, 2010 | 10:42 PM
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Sounds like a possible dragging convertor.
Is it more responsive at lower rpms when it does it?

Mark.
 
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Old Nov 15, 2010 | 03:53 PM
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Yea sounds like you need to start looking more towards the tranny, problably the torque converter
 
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Old Nov 15, 2010 | 04:02 PM
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I have the same thought if this were a manual I prolly wouldn't be here the only thing that bothers me is the intermitten action i would think the converter would just quit unless the converter valve in the valve body is stickin? and you were right about the ve pumps not real hard to disassemble I bought another one just to try and elimanate it as a factor. And as before thank you for your time in this. you fellas have a very informitive site here .
 
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