rail pres 20k psi at idle

[2l8-imgne]

the truck was running fine with everything in my sig. then I blew the trans and de tuned the truck. I took the big turbo off replace the trans and downsized the injector tips to 100's.

I put everything together and now when the truck is idling the rail pres is at 20k psi!. when I step on the throttle it will go down to 10k psi. the truck is running fine and has no misses.

I thought it was the gauge so I put my scanner on and it is rite on with the gauge. then I swapped the rail pres sensor with my buddies and that did not change. so the truck really has 20k psi at idle.

I also unplugged both fca's and the truck shoots past 30k psi so I believe they are working good


does anyone have any idea what could be goin on?

 

[Cummins610]

It should not be possible to read 30k rail. Try reprogramming the truck.

 

[2l8-imgne]

the smarty is completely off the truck

 

[ComnRailPwr]

Start checking wiring, its a headache. You also need to see what is being commanded by the ecm.

 

[04cummins kevin]

Rail pressure sensor on the pump, my 04 did this

 

[ComnRailPwr]

I would check the device you used to read those numbers. The stock sensor physically cannot read that high.

 

[Twright]

I would check the device you used to read those numbers. The stock sensor physically cannot read that high.

What does the stock sensor max out at? My autometer Is tied off the stock RP sensor and I see 29+ at WOT


I created a thread and just started following this one, might help me answer my RP questions as well.

 

[ComnRailPwr]

27.5k

 

[Bad-Duvall]

Isnt it 27301 PSI

 

[2007 5.9]

It's a 1800BAR sensor=26,107psi.

 

[ComnRailPwr]

I always thought the too les but I have logged over 27k with efilive. Never scaled sensor any differently than stock. Just changed maximum recorded rail pressure parameter. When thats changed is it automatically re scaling the sensor?

 

[2007 5.9]

I always thought the too les but I have logged over 27k with efilive. Never scaled sensor any differently than stock. Just changed maximum recorded rail pressure parameter. When thats changed is it automatically re scaling the sensor?

What I think we are seeing when it's over 1800BAR is the ECM interpretation of what it SHOULD be.

 

[ComnRailPwr]

That wouldn't surprise me at all.

 

[06 DIESEL]

I had an issue with rail pressure being 27k at idle and it turned out to be my FCA plug on the wiring harness. See this thread for all of the information about what I went through to figure it out.

P088 and P0251 - Competition Diesel.Com - Bringing The BEST Together

 

[2l8-imgne]

Turned out to be the duel cp3 controller! Thanks for the input.