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

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didn't have much luck on last post so I'll try this one. When adjusting the power screw should the truck be running or not?... JOIN NOW TO REMOVE TRACER

Power screw

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Old 02-10-2013, 08:23 AM


Default Power screw

didn't have much luck on last post so I'll try this one. When adjusting the power screw should the truck be running or not?
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Old 02-10-2013, 09:39 AM
Diesel Fan



Running, be ready to choke it out with a board over turbo if it runs away.

tampabaybill's Sig:93 D250 CCLE, S300,5x14,PDR cam,BHAF,Ported, O ringed &studs,BD ip,M3pin & timing device,propane inj.,BD exhaust man.,4"tbe,fluid damper,SunCoast47rh w/3disc conv.,D70 3:54 w/trac-lok,gauges= egt,boost,tach,tranny&rearend temps,Air Dog 150
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Old 02-10-2013, 10:04 AM
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Did you break off the welded coller on the screw? You wont get much of a turn with that on....But you will have to take the scew out to get that off...Just make sure you mark the position of where is at before you do so. From MY stock position I turned mine 1.5 turns in. When you do that you will have to back off the idle screw also as the power screw will raise the idle and rev it out or run away at the worst. Mine never ran away or even came close. And the truck should be running. The nut on the idle screw is a 10mm. Id loosen that up and get ready to back it out as you turn up the fuel screw.. To be safe turn the fuel a 1/4 turn at a time until you get to where you want at the same time backing down the idle to keep it there.

MudDrivermike's Sig:1978 bronco, 89 6BT Cummins,91 head, Dana 60s front and rear, 4.56s, 9 in suspension lift, 3 in body, 40 inch ground hawgs,727 Trans,advance adapters T case adapter,Completely rebuilt by Myself,M&H M3 fuel pin,4000 rpm spring,dynamic timing kit
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Old 02-10-2013, 11:31 AM


Up Power screw

Thanx for the answers guys. Yes I have the collar off came off very easy with a long screwdriver. I just wasn't sure about running or not Thanx again for the info.
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