smoke screw adjusting
 

do you adjust it in or out for more fuel? :humm:

you turn it in so the afc arm goes more forward

thank you sir!... couldnt remember:c:

Remember the less of the stud you see the less of whatever behind you is seen.....

towards the motor

I believe they were talking about the fuel screw in the back of the pump but i could be wrong.

no we are talking about the star wheel

The smoke screw is the one on the back of the pump that sets the depth on the AFC diaphragm as far as I have known or been told.

yes the smoke screw is the one on the back of the pump. it is underneith a cover that has two bolts and one you have to use a chizzle to get out then replace the bolt or just leave the cover off. :yeah:

does adjusting the screw on the back do anything ?

It's adjusts pre-boost fueling. It pushes the AFC diaphragm and foot forward so the rack has to travel further forward before it contacts the AFC foot. If not tuned right you can put out the flame. Read through the AFC tuning thread and you'll be good to go.

I thought you were talking about the screw in the back and not the star wheel. I would be careful when turning the screw inthe back, if you turn it to much you will hit retard notches in the rail and it will not run good until higher rpm.

????? Explain please, I've never heard of adjusting anything in the AFC affecting anything other than the fuel curve.

:pca1:

is there anything to gain by adjusting the smoke screw on the back of the pump? i dont mean the starwheel. my truck doesn't smoke and i'd like to keep it that way, just wondering if there's any power hidden in that little screw?

It increases pre-boost fueling. You can adjust it and see if the truck picks up some and if it makes to much smoke you can back it off.

Does anyone have a pic of the where abouts of the "smoke screw" I cannot seem to find it..my truck runs like crap at low RPM but runs great with a little throttle..maybe this screw is in too far??

Look in the AFC Adjustments thread.

its under a cover on the back of the afc, one screw is a tamper proof screw, i just grabbed it with vise grip. the screw has a jam nut on it

thanks guys..found it.

If turn it in it moves the afc arm foward and makes more smoke back it off and it will smoke less and i dont think it really gives you much power i think its mainly for tuning the pump not so much for power.

yea its just tuning, adjusting it in allows the governor to travel further without any boost,

The smoke screw won't affect the rail, it merely preloads the diaphram in the pre-boost fuel circuit, once on boost the AFC and ALL of it's components are out of the loop. Okay not completely....it WILL hinder gov arm full travel if you have the extended rack plug, but we won't go into that yet. Preloading the smoke screw moves the AFC foot towards the front of the motor as said above and allows more pre-boost fuel. So does moving the position of the AFC relative to the pump itself via it's mounting screws. The star wheel is the opposing force to the diaphram's movement aka the pre-boost curve. The looser the star wheel, the quicker the AFC will allow power circuit fuel....or black smoke id that's what tickles your fancy. It's not the true way to tune, but it makes for a good show. Recurving with springs and fine tuning all 3 adjustments is the best way to tune, but most just wanna gut it and make smoke....the turbo will eventually catch up LOL. Anyway, turn the top of the starwheel towards the engine to loosen the pre-boost curve.

Chris

Exactly......Very well said

you pretty much covered it all:tu::c:

How much will it raise my egt if all the way screwed in? I have no pyrometer and cant afford one after being laid off
:scare2:

it wont because you arnt giving your engine any more fuel just changing when you get it. overall EGT raise should be unnoticable.

Thanks thats all i will do for now untill i get me a pyrometer i guss:c:

My truck has 90 hp sticks, timing advance of 16*. just got my pump adjusted, and the ruck works great, it doesn't smoke much, but when it hits torque lock in 3rd you can see some smoke. If I turn back the smoke screw it should stop smoking, and not affect the pump, or any adjustments for fuel delivery?

Corb

:c:

Does a07 have a smoke screw

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Does a 07 5.9 have a smoke screw

Nope

Luke

does moving the smoke screw cause the pump from running away i wanna moke it alittle but not to much would like to know so i dont cuse my self a big headache:humm:

do some reasearch on tuning your afc. there is a good one floating around here somewhere. it explains the afc pretty well and what each adjustment does. i would leave your afc alone and buy a more aggressive fuel plate. but no you wont have a runaway from -messing- with the screw, just an improperly tuned truck, that doesnt run right.