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

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  #11  
Old 12-20-2009, 03:28 AM
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Originally Posted by stillcummin
what? Your afc may be sticking
sticking open? like full fule
 
  #12  
Old 12-20-2009, 07:38 AM
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shoot some pb down in the vent hole
 
  #13  
Old 12-20-2009, 02:58 PM
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ok no change
 
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Old 12-20-2009, 04:07 PM
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Sounds like your base timing is either retarded too much or perhaps the inner timing advance mechanism isn't working right.
 
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Old 12-21-2009, 01:10 AM
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Originally Posted by Begle1
Sounds like your base timing is either retarded too much or perhaps the inner timing advance mechanism isn't working right.
english plz
 
  #16  
Old 12-21-2009, 01:46 PM
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First I'd pull the pump and check the injection pump key. Just a little bit of deformity on the key due to an impatient or inexperienced install can result in bad timing.

I'd reinstall the pump in the position it was in and see if that magically fixes anything. If not, I'd advance the tooth a gear.


The combination of low boost with lots of fuel and EGT's means that it's fueling but not burning. The most common problem would be a boost leak (which should be tested by blocking off the intake ducting and pressure testing it), wrong timing (easiest to test through trial-and-error, or you could use a timing light), bad injectors (you say they've been bench tested repeatedly) or maybe bad fuel. I've seen bad fuel result in smoke and low power before. But to me, this sounds like a timing problem.


The pump's base timing is it's position relative to the crankshaft, adjusted by physically moving the pump. The pump also has an internal timing advance mechanism that advances the timing with higher RPM's, and if it's not working due to varnished insides, a broken spring or low internal pressure it could result in poor top-end performance. It's usually a pretty subtle problem, though.
 
  #17  
Old 12-21-2009, 06:27 PM
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Wait until you get your injectors back, try them first before you do anything rash.
 
  #18  
Old 12-21-2009, 07:27 PM
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thats the plan the rig sat for 3 months with less than 1/8 tank of fule while i did all the rebuild stuff then this all just happened after i got it all done

smokem when you gonna send them?
 
  #19  
Old 12-21-2009, 07:30 PM
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Should go out Wednesday.
 

Last edited by Smokem; 12-22-2009 at 11:16 AM.
  #20  
Old 12-21-2009, 08:59 PM
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sweet its like a X-mas present to myslfe yeppie
 
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