hobbz

I can't tell which it is, a tick or a tap, but from outside the truck i can hear it more/louder from the drivers side. I know its not the lift pump cause it is not in the engine bay(in tank). To me it sounds to loud to be an injector, but I have never owned a diesel before.

What all could it be besides an injector? cp3?

I can kinda hear it or a sound similiar but quieter with only the key in the "on" position.

I am getting a solid 9psi from my lift pump at idle and when the key is "on".

Any help is appreciated...

Hobbz

desertdieselboy

I`m a noob, I noticed it too. I`m gonna drive mine til breaks

dodgezilla04

there is a thread about re-orientating the timing of the cp3 gears. take a look for it and read, if i can find it, i'll post the link.

desertdieselboy

this it?
https://www.dieseltruckresource.com/...ing#post914454

thx,
C

EDIT: na that`s not it...I`ll check searching-thanks for the heads up.

cbrahs

i have a simular noise from mine, took it to the dealer and they said that they would not do anything to it unitl i had 15k or more miles on it.

hobbz

I got an auto stethoscope today, but haven't got to listen to different parts of the engine yet. Where is the cp3 in the bay? I haven't the slightest idea.

On a side note. The reason I haven't listened to anything yet is because my neighbors are outside and I don't want to make them mad... haha... I can't wait tll our next contract at work. After it is approved I am moving out in the counrty. I am gonna have at least 20 or so acres so I can have room for all my toys and have room to have freinds(you guys) over. BTW I work for AK Steel and I am sure everyone heard what happened with the middletown, oh plant when the union contract came due. on strike for over a year. I really hope that don't happen to us.

hobbz

YUCK

Just got the steth out and am pretty sure that it is the cp3. I could hear it clear as a bell when i touched any of the lines leaving the fuel rail to the injectors. anywhere around the head or exhaust side i could just barely hear it so im pretty sure its not a valve.

Has anyone been about to dig up the thread about re timing the cp3? i have searched all combos to the words and haven't found it.

Minwy

https://www.dieseltruckresource.com/...d.php?t=161619

Here is the thread. Sounds like what mine was doing before I rotated the cp3's shaft so it was no longer out of time with the engines stroke. Mine would get louder when the engine was hot and the oil thinner , which let the gears make more noise when they slapped.

chrisw1173

Hey Guys. Im Glad some one brought this up .My truck has 70.000 on it and has made that same noise for as lone as I cam remember.I thought it was A injecter but never any of the sings of one like oil level or smoke.I could here the sound in the lines more so in the #1and #6 but a little in all off them.so could It be an injecter or do yall think its the cp3 timing ? just wanted to ask sience someone else was having the same problem.

hobbz

actually i don't think that is really all my problem. i can also hear a clicking/ticking/something when the key is in the ON position without the motor running.

could it be the overflow valve or anything?

coolslice

My ticking sound was a loose fuel line clamp. I would have never thought it could have been that loud, but according to the Cummins tech it's a very common problem these days. Wouldn't the tick with the engine off be the grid heater? I don't know why it would be doing it in the summer, but stranger things have happened. In the winter, the ticking will stop when the wait to start light goes off.

vzdude

The clicking with the key on is the FCA. You should be able to feel it. The FCA ( fuel control actuator ) is on the back of the CP3.