Need opinion on eng misfire

[bones1]

Just brought the Deuce out of hibernation for Memorial day and the engine is breaking down(missing) at 1500 rpm with a big loss of power. Any ideas what could cause this condition. It has always run perfect before this. The diesel is not that old 3 months maybe. I know where to look on a gas motor but I am thinking fuel related on this?.
Thanks for any thoughts.

 

[RAYZER]

Sounds like a stuck injector. Crack each injector line (at injector) individually while motor running to find the culprit.
Or it may be fuel filters cloged.

 

[gimpyrobb]

Also, you can put the handle of a screw driver to your ear and touch the tip to the injectors. You will be able to tell the ones not firing right.

 

[DavidWymore]

Even better, get a mechanics stethoscope, they're awesome. Check for exhaust manifold port temp differences in warmup.

For some reason, the fuel was turned way down on my water deuce when I got it, and it popped and crackled and had low power. Point being, lack of fuel (filters maybe) makes snap crackle pop.

 

[bones1]

Sounds like a stuck injector. Crack each injector line (at injector) individually while motor running to find the culprit.
Or it may be fuel filters cloged.

What am I looking for when I crack each line? I did the long screwdriver test on injectors and they all sound the same Gimp.
It goes all to pieces at 1500rpm and up.

 

[gimpyrobb]

If the injectors sound the same, I'd say you have hydraulic head issues.

One truck I worked on would fire up but run like crap, nothing sounded wrong. I pulled the injector lines and turned the motor over. 3 holes shot fuel out and 3 didn't. Swapping out the IP solved the issue.

I hope thats not your issue, but its heading that way imho.

 

[bones1]

Let's hope that is not the case.

 

[RAYZER]

What am I looking for when I crack each line? I did the long screwdriver test on injectors and they all sound the same Gimp.
It goes all to pieces at 1500rpm and up.

Cracking the line nut on a working injector will decrease engine rpm.
You will hear it.

 

[bones1]

Thanks. So if I crack a line and have no change in the engine I have a clogged injector I presume?.

 

[gimpyrobb]

Be careful if you do that, the fuel is at full pressure in those lines. I have heard it can inject fuel in your skin and give you blood poisoning or something.

I have read that these are positive displacement pumps(the IP is) so the fuel will go somewhere(unless there is internal issues)!

 

[DavidWymore]

Yeah, pretty sure it's like 3000 psi, which is poke-a-hole-in-you pressure.

 

[bones1]

Yeah it is. Didn't have to do that test. I changed the secondary filters and it runs like new now. I got lucky this time. Thanks for all the help folks.

 

[rustystud]

Be careful if you do that, the fuel is at full pressure in those lines. I have heard it can inject fuel in your skin and give you blood poisoning or something.

I have read that these are positive displacement pumps(the IP is) so the fuel will go somewhere(unless there is internal issues)!

This is not an "old wives tale" ! I've seen this happen and it's not pretty ! One of our mechanics was careless and allowed the fuel to go through his hand while holding the injection line. He had to go to the Emergency room immediately ! He wasn't back to work for over a week. They had to connect him up to a "dialysis" machine to clean out the diesel in his blood.

 

[nchittendon]

My first thought is fuel filters, and you all jumped right past that. I'm not trying to be a jerk, I'm just curious what the tip off was? Pardon my ignorance, still very new at these trucks.

 

[red]

Cracking the line nut on a working injector will decrease engine rpm.
You will hear it.

Realize the problem has already been solved, just posting this up for others regarding safety. When you crack open the line it only needs a 2/3rd or less rotation of the line nut, and ALWAYS USE A WRENCH (line wrench is better), provides distance from the pressurized fuel.

 

[RAYZER]

Realize the problem has already been solved, just posting this up for others regarding safety. When you crack open the line it only needs a 2/3rd or less rotation of the line nut, and ALWAYS USE A WRENCH (line wrench is better), provides distance from the pressurized fuel.

Yes,and since I originally brought this up, when you Crack an injector line at the injector the fuel more less dribbles out and disables the injector, no Hi pressure put your eye out fuel spray to be had.
Be careful though!