Can someone look at this log and give me some idea what's wrong. I just put a built motor and dual Cp3's in my truck. Any idea's where to start?
Rail Pressure all over the place. Please Help
- Thread starter JD Dave
- Start date
I can't see the log right now at work but what is the truck doing? Did the problem start when you put the dual cp3's on? Stock pumps? Stock regulators?
I put the built motor and dual CP3's on at the same time. The pump in the vally came from Floorit deisel and it's modded LBZ. It came with the motor and was brand new in a box. The other pump is a brand new LMM from PPE.
I tried unhooking the the dual Cp3's and hooking the factory plug back up and the truck just goes to reduced power. I'm thinking I have to take the second pump off and put the factory idler and belt back on to try it. Any suggestions?
If you unhook the second CP3 plug you need to take the belt off also. if you dont by just unplugging the regulator and leaving the belt on the CP3 will put out full rail pressure. If you unhook the plug unhook the belt.
I think I'll throw the stock belt back on and take it for a drive. Still trying to decide if it's a tuning issure. Thanks for your help.
If your just testing the valley cp3 just leave the belt off and have a batt charger on
then check rail press
ofcourse diconnect the ppe harness
then check rail press
ofcourse diconnect the ppe harness
Use dvt to ramp rail at idle that will tell u if it's working
It will also tell you if you have leaks...i learned really fast that i left the fitting in the fuel rail loose....
Use dvt to ramp rail at idle that will tell u if it's working
I like what your saying but I have no idea how to do that.
could very well be the modified CP3 mine did that until the tune got ironed out... If i had it to do all over again i would leave the CP3 that is modified out of the valley
Looks like it was the modded regulator. I changed that out and all is good. Using the DVT controls it seemed fine but under load it wasn't. Going to the pulls in a few hours so we'll see for sure. I learned alot about my fuel system in the process. Special thanks to Simon and JoshH and everyone else who gave me places to look.
I can't keep my rail pressure from fluctuating like a yo yo still under wot with the dual fuelers so I took them off. I must have been smoking something when I thought I had them fixed. I'm running one pump now and everything seems fine on the stock tune but when I put the big tune in I can only hold around 23000 psi rail pressure but it's steady. Am I wrong in thinking something is wrong with the the dual fueler electronics. I checked all my wiring over and my ground is good when I unhook the second pump the pump makes a noise and the truck goes into high idle. I'm getting a little fustrated. I'm going to the pulls tomorrow on one pump but I'm not happy.
You shouldn't be able to hold Rail pressure with 100% over injector on one CP3 with a hot tune. That sounds normal to me.