Misfire on a 13B-T? Whats causing it?

[Pr0x1mity]

Hey guys,

About to pickup a Bj74 from a family friend cheap that has a misfire.

Car was not driven for 5 years and then driven around. It soon after developed a misfire.

Injectors have been replaced. The misfire is on Cylinder 2.

Piston ring? What else could it be other than those two things? I'm not really a diesel mechanic haha.

Really hoping to salvage this car from scrap.

 

[Behemoth60]

Hey guys,

About to pickup a Bj74 from a family friend cheap that has a misfire.

Car was not driven for 5 years and then driven around. It soon after developed a misfire.

Injectors have been replaced. The misfire is on Cylinder 2.

Piston ring? What else could it be other than those two things? I'm not really a diesel mechanic haha.

Really hoping to salvage this car from scrap.

As Lowenbrau once said... "So many things can go wrong to stop a gasser from running.... So many things must go wrong to stop a diesel from running"

The engine needs fuel and compression to run.
If it has new injectors, then you are down to Injection pump, high pressure line, or compression as culprits. Compression is easiest to check and most likely, so get a compression check done.

My 13B-T had a crappy felt head gasket, and that could be bad and letting out your compression. That is most likely. Rings are possible source of poor compression.

Next is to check your high pressure fuel line from pump to injector. It has to be unclogged, unkinked, and free of leaks. Again, next easiest thing to check.

Assuming compression is good, you've got a good injector (new injectors are not, by default, good...!), and good lines, then your injection pump is a culprit. I know little about them, because they are so reliable, I've literally never had to fix one. And because they are so reliable, you might actually find a good used one around where the rest of the truck has disintegrated around it. But, taking one to a diesel injection shop for a rebuild can make the rest of the truck financially challenging.

 

[toyobaru]

As Lowenbrau once said... "So many things can go wrong to stop a gasser from running.... So many things must go wrong to stop a diesel from running"

Well said.

 

[roscoFJ73]

Hey guys,

About to pickup a Bj74 from a family friend cheap that has a misfire.

Car was not driven for 5 years and then driven around. It soon after developed a misfire.

Injectors have been replaced. The misfire is on Cylinder 2.

Piston ring? What else could it be other than those two things? I'm not really a diesel mechanic haha.

Really hoping to salvage this car from scrap.

Is the misfire there constantly or does it go away when its warmed up?
Was the misfire there before the injectors were replaced?
How many klms on the engine?
Are there any leaks between the injectors and fuel pump?


Bad compression usually comes on slowly over the life of the engine.It doesn't come on overnight unless something has damaged the bore/piston/ring.
If it has lost compression on one cyl,it will usually begin to fire when the engine warms up.

 

[brownbear]

Air in the injection system. Maybe it wasn't bled properly. Or it keeps sucking in some.

Feels like a gasser misfire. Like a stumble. But there is no such thing on a diesel.

Open up the FSM and read about bleeding the fuel system.

On a 3B I would crack the fuel line going into the injectors while it is running with a rag and wrench. Just a half turn till the fuel coming out is just a mist. Then the next and repeat. Probably a 13B-t is the same to do.

On a 3B when you get a bunch of air in from a filter or nozzle change it is quite fun to bleed it all. But does solve the issues.

 

[Pr0x1mity]

I said i'd take on the car. Body wise the car is great. It's only really been on a little bit of dirt, more of a family camping car etc. Hasn't been driven in years though.

Lots of stuff in the car is great. Picked it up for $3000 with the misfire. It's top spec Bj74 though.


I've got a diesel compression checker, ill pop it on saturday when I grab the car. I'll also have a permit to drive the car temporarily so we'll see.

He seems to think it's the oil ring not seating properly. I think he said something about getting oil in the turbo.

Ill check compression, bleed the fuel system and see what happens. His mate whos a mechanic said take it for a good drive, it might be a sticky ring.

I'll take the long way home from his to mine (its normally a 15 min drive, but ill drag it out for 45 mins)

See where it gets me. Thanks for the help guys, really loving this forum. Some good advise and info here (been browsing some old threads and reading up)

Need to get part numbers for the piston rings and headgasket if its one of those. Been trying to get pricing on them..