Hello,
Very new to the forum so I'm probably in the wrong section.. I have read many of the helpful posts in the past but I couldn't find anything exactly relating my issue.. I apologize if I am repeating a thread..
I have a 2004 lly with 315k on it, very stock.. brand new battery's and starter and fuel lines all the way from tank to cp3 and apparently has a new cp3 according to the guy I bought it from(whom I think I trust lol)
Truck runs strong and has plenty of get up and go..
I bought the truck and the guy said it has a fueling issue so I don't know much of the history of the issue. At first it seemed as though there was constantly air in the fuel lines.. and I couldn't get the truck to start after off for more than an hour it would crank forever and I would give it a small shot of ether and it would fire right up... I suspected a bad filter housing or lines so I put a new system in with an aftermarket sump and inline filter with a primer bulb.. after getting that all primed and free of air(I think) the truck will start every time but it cranks to long(15-20 seconds when cold)(but only a few seconds when warm)(maybe that is normal I don't know)
Now.. my main issue at hand is that when it does start it stalls instantly .. not 1 second later... Right away!. And does not keep cranking if you hold the key turned..so I believe it has technically started. it does that maybe %50 of the time and the other 50 it starts but the the rpms dip very low and it almost stalls but then bounces right back up to normal idle.. I have started and run the truck quite a bit since changing all the lines so I think all the air is out of the system..
I have done the bottle test and got no fuel in my bottle.. so I'm thinking the fuel rail pressure relief is ok..
I am suspecting the fuel pressure regulator on the cp3 now.. it has a bit of a rough idle but nothing crazy
I have been using a Bluetooth obdii reader connected to my phone to watch rail pressures..
When off but key on my rail pressure bounces from 253-279 psi
When on at idle rpm my rail pressure fluctuates from 4023-4562 psi(sitting graphing high and lows for 15mins) my understanding is something closer to 4900 and within 200-300 psi is desirable..
When I give it some throttle in park I have hit over 16000psi (wasn't trying to get as high as possible just gave it a one shot)..
It is running two codes at this time.. maf and a tranny code of some sort other than that it is clean.. tried the 3 key reset.. going to try the 30 minute security reset and check grounds next but I don't think that is what it is?..
Thank you for your time and reading this!.. any and all info is muchly appreciated!
Thanks
-Caleb
Very new to the forum so I'm probably in the wrong section.. I have read many of the helpful posts in the past but I couldn't find anything exactly relating my issue.. I apologize if I am repeating a thread..
I have a 2004 lly with 315k on it, very stock.. brand new battery's and starter and fuel lines all the way from tank to cp3 and apparently has a new cp3 according to the guy I bought it from(whom I think I trust lol)
Truck runs strong and has plenty of get up and go..
I bought the truck and the guy said it has a fueling issue so I don't know much of the history of the issue. At first it seemed as though there was constantly air in the fuel lines.. and I couldn't get the truck to start after off for more than an hour it would crank forever and I would give it a small shot of ether and it would fire right up... I suspected a bad filter housing or lines so I put a new system in with an aftermarket sump and inline filter with a primer bulb.. after getting that all primed and free of air(I think) the truck will start every time but it cranks to long(15-20 seconds when cold)(but only a few seconds when warm)(maybe that is normal I don't know)
Now.. my main issue at hand is that when it does start it stalls instantly .. not 1 second later... Right away!. And does not keep cranking if you hold the key turned..so I believe it has technically started. it does that maybe %50 of the time and the other 50 it starts but the the rpms dip very low and it almost stalls but then bounces right back up to normal idle.. I have started and run the truck quite a bit since changing all the lines so I think all the air is out of the system..
I have done the bottle test and got no fuel in my bottle.. so I'm thinking the fuel rail pressure relief is ok..
I am suspecting the fuel pressure regulator on the cp3 now.. it has a bit of a rough idle but nothing crazy
I have been using a Bluetooth obdii reader connected to my phone to watch rail pressures..
When off but key on my rail pressure bounces from 253-279 psi
When on at idle rpm my rail pressure fluctuates from 4023-4562 psi(sitting graphing high and lows for 15mins) my understanding is something closer to 4900 and within 200-300 psi is desirable..
When I give it some throttle in park I have hit over 16000psi (wasn't trying to get as high as possible just gave it a one shot)..
It is running two codes at this time.. maf and a tranny code of some sort other than that it is clean.. tried the 3 key reset.. going to try the 30 minute security reset and check grounds next but I don't think that is what it is?..
Thank you for your time and reading this!.. any and all info is muchly appreciated!
Thanks
-Caleb