Rail Pressure - CP3 Problems??

[pipeguy]

I have a rail pressure guage and am seeing only 2500psi on idel and only a max of 13000 at WOT.



On the highway I am seeing 7500 at 65MPH at 1900rpm. TST not on , No EZ and smarty on 5



This is WAY low is it not?



I am a 2003 250hp auto 4x4.



I do not have a line pressure guage, but am running an airdog.



There is an idiot guage on the airdog and have never seen it on, or even flash.



WHat do you think the problem may be? CP3Pump gone? Check valve on the rail worn out? Injector problems?



I am pulling my hair out with this truck... .

 

[RobertP]

I have a rail pressure guage and am seeing only 2500psi on idel and only a max of 13000 at WOT.



On the highway I am seeing 7500 at 65MPH at 1900rpm. TST not on , No EZ and smarty on 5



This is WAY low is it not?



I am a 2003 250hp auto 4x4.



I do not have a line pressure guage, but am running an airdog.



There is an idiot guage on the airdog and have never seen it on, or even flash.



WHat do you think the problem may be? CP3Pump gone? Check valve on the rail worn out? Injector problems?



I am pulling my hair out with this truck... .

what you didnt say was how is the power? is it low or normal, it could be several things.

 

[pipeguy]

Low power . . low smoke been coming on for a few days now (5-6).



Heavy pedal feel (not much power), idel is rough. Did throw an injector #1 code 0201 (i think) with the TST las week. Thought it was just a wire issue. straightened the harness and unplugged and re plugged all back in and it went away.

 

[Prairie Dog]

Sounds like the relief valve on the rail may be gone. As I understand it, you can crack the bolt on the top of it while it's running and if it leaks at idle, it's shot.



Scotty

 

[pipeguy]

Can you just cap and replace the pressure relief valve? Or should I just try a dual feed line and pull the valve?



Do you need the valve?

 

[Graphic man]

man that sucks !!



hope you get it figured out Ian !!



i am not much of a 3gen guy..... but your in good hands here !!



Scott

 

[JThacker]

You can pull the banjo bolt on the relief valve but even if your valve is good you will get leak from the return line from the cp3. To correctly test the relief valve you need an adapter available from glacierdiesel.com, Richard has them. You screw the test adapter in place of the banjo and put on a piece of tubing and start the engine, if your relief valve is bad it will leak fuel, if it is good, no fuel leakage. The adapter is only 20 bucks or so, pm me for any more questions. In my opinion you need the valve to protect your injectors from pressure surges, especially if you run a pressure box. Jay

 

[pipeguy]

Any one have a photo of the rail where the check valve is???

 

[sag2]

Hope this works. A caution, the fuel coming out of the valve (if it's leaking) will be very hot.

 

[RobertP]

Any one have a photo of the rail where the check valve is???

the best way to do this is to take the banjo out of the valve, bend the metal line out of the way and start the truck fuel will come out of the line( it is normal), but should not come out of the valve. if no fuel comes out the prosed to haveing someone stab the throttle peddle once or twice, if fuel comes out at any time during these events the valve is bad. if there was no fuel, reasemble and move on cause the relief valve is not your problem.

 

[RobertP]

Low power . . low smoke been coming on for a few days now (5-6).



Heavy pedal feel (not much power), idel is rough. Did throw an injector #1 code 0201 (i think) with the TST las week. Thought it was just a wire issue. straightened the harness and unplugged and re plugged all back in and it went away.

sounds like a injector or a relief valve.

 

[pipeguy]

No excessive back flow or fuel from the valve on idel. Ordered new injectors and check valve. Will be in tomorrow.



I had an issue with the Airdog Pump not working properly. Corrosion in the connectors due to Canadian Weather. Took it all apart and cleaned everything up. Better pressure now but still not right.



Threw codes this afternoon... .



P0336



P0606 ECM Hardware Error



P0628 Low power at lift pump



P2122 Accelerator Petal Sensor 1 Low



P0602 Check Sum Error





Can anyone help with these? Are they related to the above? Can any of these be Smarty or TST related?

 

[RobertP]

0336 is crankshaft positioning sensor signal



the 0602 is from the smarty



0628 is from not having the stock lift pump connected. possibly the relay removed.



Robert

 

[WPeschel]

I have had that 0336 code before it was the TST... I called them and they told me I have the old program and to send mine in for updating. . I will do that next week when i get time to pull it off... Wes

 

[pipeguy]

I just got my TST back a few months ago from a re-flash...

 

[DerekW]

. In my opinion you need the valve to protect your injectors from pressure surges, especially if you run a pressure box. Jay

oh really I just had my truck pressure relief seals replaced now i am having misfire at full throttle. I also have white smoke cloud at startup. I was saving up for Twins but now I think my savings are going toward injectors are a repair/mod. What do think fails though the injector body or the nozzles?

 

[Shifter]

If the relief valve opens 1 time will it reseat? Is this a 1 time saftey valve or does it wear down over repeated openings?

 

[Bob4x4]

The valve should take a few events before it fails. The 6. 7 has been redesigned slightly. It also counts events... ... ...



Bob

 

[hotram03]

DerekW I think it would be the nozzles, reason I say this, my brother had a injector body separate on his '06 filled engine full of diesel fuel, snoot tube had major blowby, diesel in oil. With a tip and a pressure box without a low micron fuel filter(something like the 3 micron fleetguard) with the ramped up pressure form a pressure box any debris is going to be forced to go thru the nozzle hole by an even higher pressure and it will be forced to do damage, whether it be hole errosion in time, this will happen to a stock truck in time but sooner with a pressure box, or crack a nozzle, just my 2c.

 

[Strokercummins]

Hi



Could some of you CR experts give me a hand or better yet, your knowledge? The CR pressure relief valve has a history of failure. I have been looking on the web for a few days to find out why.

This is what I've heard. (1) The spring weakens and looses its force (2) The seat and poppet become etched (3) The poppet tip breaks off

What have you guys experienced? Have you done any testing on the CR relief valve?



Thanks for helping me out.

Rob