03 Cummins rail pressure

[searstractorfan]

Whats the rail pressure supposed to be at idle on my 03 cummins? I got around 5000psi...on my gauge it might be on 5000psi then it might be a hole needles with above 5000psi, and then right back down...it just sits and jumps up and down like that ever since I installed the gauge...Its kinda irritating as if the radio is off and its quiet in the cab you can actually hear the gauge moving(hehe yes u can hear the electronics moving the needle)..is this normal? it seems to run fine so I dont think its hurts it....

 

[Cumminalong]

That's right where it should be.

The '03 and '04 trucks idle at ~5K psi. The 04.5+ trucks idle at ~6.8K psi. The 03/04's have and 8 hole injector nozzle with smaller holes, requiring less pressure to atomize. The 04.5+ use a 5 hole nozzle with larger holes.

And yes, the motors on some of the electric gauges do make noise. My oil pressure does the same thing.

 

[searstractorfan]

But it worries me that it kinda fluctuates(bad spelling) its not a steady 5000psi, or does it do that?

 

[Cumminalong]

Totally normal.

The ECM varies the pressure to maintain a smooth idle.

Mine fluctuates between 6400 and 7200 at idle.

 

[searstractorfan]

Cool, thats the info I was looking for!! THANKS A MILLION rich!!!!PS, I got a guy maybe looking to get the same gauges, mount and chip as I got......so I might be pm u to get a price for him as he said he hasnt found them anywhere else for less than $1700(where he looked I dunno)

 

[Cumminalong]

Sounds good.

Just have him give a holler and we can get him taken care of.

 

[btfarm]

fluctuates(bad spelling)

Good spelling actually...

 

[searstractorfan]

SWEET spelled it right!!!! hehe I get lucky once in awhile! now i will spell everything wrong for a week.....