4m50 engine sputters

[boostin]

Hello

I have a 06 fuso fe. The truck seems low power and high fuel consumption. Truck has all basic maintenance, valve adjust and fresh injectors and filters.

I have noticed when in neutral when you rev up the engine it sputters and builds no boost till about 2000 rpm then it gets boost and revs smooth.

Any ideas¿

 

[kerry]

I'm surprised it builds any boost at all in neutral. It's very hard to get any turbo boost without a load. Do you have a boost gauge? Have you checked to see if the turbo is spinning freely and the air filter is clean? Is the fuel pump operating correctly?

 

[boostin]

Yes, I have a boost gauge, filters are new.

According to the factory neutral should build about ten pounds in neutral.

Being a common rail should set a check engine light if it had high or low rail pressure so I assume the pump is working.

It sputters like it's running to rich, like a carb gas engine with the choke stuck on

 

[dlh62c]

.....Truck has all basic maintenance, valve adjust and fresh injectors and filters.

Could the fuel system be sucking in air somewhere?

If a bubble of air comes up to the injection pump, it will try to inject it into a cylinder, thus causing a sputter. The smallest of air leaks can cause the system to lose its prime while sitting.

Do you have difficulty starting the truck after it sits for awhile?

 

[boostin]

It it fires right up no matter how long it sits.

I did even replace several fuel lines to.

 

[dtruzinski]

It it fires right up no matter how long it sits.

I did even replace several fuel lines to.

Long shot, but have you checked the glow plugs
http://www.accuratediesel.com/gplugs.htm

 

[boostin]

I actually just installed new oem glow plugs

 

[boostin]

It starts amazing, just a bad sputter between idle and about 2000 rpm

 

[dtruzinski]

How about a cracked or leaky vacuum line? It would tend to stumble under low RPM and then smooth out (?).

 

[boostin]

Long story short I changed the fuel fleet again and solved the sputter. Only had maybe 2000 km in it but I guess the old tank and fuel pipes where rusty cause the new tank I installed is shiny clean.

Guess I better keep a eye in this but might explain the lack of power and terrible mpg I was getting