Intermittent loss of power

MLUNGISI

MEMBER
2018 NISSAN NAVARA
2.5L
4 CYL
4WD
MANUAL
200,000 MILES

I have another problem developing from another YD25 engine. When driving it's having intermittent power loss. I have replaced the prime pump, sediment sensor cleaned the fuel tank, and put a new diesel filter, still, I am having the same problem.
When driving the vehicle just loses power. The RPMs drop.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

If while driving and the power on a diesel engine drops out that is normally a fuel issue, so I think you are on the right path. What I would suggest is when driving the vehicle monitor the fuel pressure with a scan tool when it loses pressure. You should have fuel pressure sensors that will tell you what the commanded pressure is and what the actual pressure is. These should be close to each other at all times with the actual pressure trailing by a second or two.

Also, do we have any codes at all?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Basically, I think we need to confirm we have two things. First, we have proper flow/volume of fuel and the correct pressure.

https://www.2carpros.com/articles/symptoms-of-low-engine-power

We don't offer this engine in the USA so we don't have a manual on it, but I am sure we can work through this and figure out what the issue is.

Let us know what you find with this, and we can go from there.