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

Idle adjustment????

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Old Jul 25, 2009 | 07:07 PM
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Default Idle adjustment????

I got my window's tinted friday, so been running the a/c alot more and has done this ever sence I got the a/c fixed. But when in gear and stoped it kinda lugs idling, the voltage goes from about in the middle of the gagues to about in the middle of the dead and the first mark. Do I need to adjust the idle higher?

Thanks
 
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Old Jul 25, 2009 | 07:31 PM
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Could be the problem.
 
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Old Jul 25, 2009 | 07:40 PM
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my volt gauge drops some when my ac goes on to but its all good

how dark did u tint urs
 
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Old Jul 26, 2009 | 03:42 PM
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20%, dissapointed tho, should have went wtih 10 or 15.

Ya but mine drops quite and bit and makes the truck sound like its lugging idling in gear at a stop, but if I hold the break and add a little throttle(very little) everthing's good.
 
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Old Jul 26, 2009 | 05:13 PM
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Definitely sounds like the low idle screw is too far backed out. Use a screw driver and hammer to loosen the lock nut, then use a 1/4" wrench to slowly thread it forward a couple turns. Then use the screw driver and hammer to re-tighten the lock nut.
 
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Old Jul 26, 2009 | 09:24 PM
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Awesome thanks man.

I did notice that when not warmed up its fine, but once its warmed up it acts up like i mentioned earlier.
 
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Old Jul 26, 2009 | 09:32 PM
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A little bit of that is normal, otherwise it's a sign of a worn pump. The hot-idle drop can get to the point that the pump needs to be replaced; I've been told that it is the symptom (along with low power and inefficiency) of a worn head/ rotor assembly.
 
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Old Jul 27, 2009 | 09:24 AM
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that's weird I was told by the pervious owner and a good guy at a shop that the truck has a newer pump and fuel pump.
 
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Old Jul 27, 2009 | 01:20 PM
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A little bit is normal. If it's dropping just 50 RPM when warm, that can put you from a comfortable level to a near-stall level with an automatic and air conditioning on. Dropping a couple hundred and that's very likely to happen.
 
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Old Jul 27, 2009 | 08:42 PM
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Is there anything I can do?
 
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