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

Can't get my idle down

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Old May 15, 2012 | 01:47 PM
  #1  
1stgen12valve's Avatar
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From: Copperas Cove
cool Can't get my idle down

So I had to replace my pushrod cover last weekend and figured since I had the pump out I would tinker with it. I had already moved the timing up ran the screw into the collar and moved the fuel pin. I took off the collar on the fuel screw and ran it in alittle more. that made a world of differance I was getting smoke at full throttle and the truck really came alive, but it was very close to running away so I turned the screw in half a turn and that seemed to be the sweet spot. However the idle was crazy high I turn the idle screw down some and not much diffreance. I turned down again and still pretty high. I bumped the timing back alittle and that didnt help I really dont want to turn the screw back out. Is ther anything else i can do.
 
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Old May 15, 2012 | 08:22 PM
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welderboy250's Avatar
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Reindex lever on shaft
 
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Old May 15, 2012 | 08:30 PM
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Lengthen the rod that connects the injection pump's fuel lever to the throttle bellcrank (the one that looks like a tiny tie-rod). Just screw it out till the idle drops where you want it.
 
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Old May 15, 2012 | 09:41 PM
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good idea why didnt I think of that
 
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Old May 15, 2012 | 10:00 PM
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if thats not enough you'll have to just back the fuel skrew out a little more.
 
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Old May 15, 2012 | 10:30 PM
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i have saw fellers bend the plate where the idle screw hits.
 
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Old May 16, 2012 | 11:51 AM
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Take out the screw all together lengthen the throttle linkage with the ball stud ends and move the stud to the other hole

Sent from my DROIDX
 
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Old May 16, 2012 | 02:49 PM
  #8  
db Zac's Avatar
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is the idle stop on the leaver touching the casting yet? What I did was put both jam nuts on the back of the idle stop screw instead of having one at the front and once at the back.
 
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