2350 fuel pressure decay Fault code 4726

[SemiSweet]

(02-24-2021 )Rawze Wrote:  

(02-24-2021 )SemiSweet Wrote:  ...kinda clickity clackity for lack of a better term. Much More so than the previous tune.
...

your previous tune was wound up to tight.

without a tiny bit of lash in the head at idle, the top end does not get lubed very well. Just make sure your valves are adjusted properly.

Update,
I was able to borrow rail caps from a neighbor mechanic and found three leaky injectors 1,2, and 5. No more knock and clicking noises and now i have beautifully smooth running Cummins. Rail pressure did not drop all night long, it truly is a beautiful thing!

The real bad thing about the original de mandate tune is that the Check engine light did not come up. Out of maintenance sake I connected insite to check things out and the code was there. The truck didn’t seem to run to bad. For someone who didnt have insite or a good ear it could have been much worse as damage would be done before a person realized there was a problem.

I Appreciate your help on this Rawze!