John93CTD

Ok guys got into my truck lastnight started her up and let her run for about 20min took off down the road and everything was normal and all of a sudden I lost power and it started missing real bad. When I would give it fuel it would spit and sputter and start popping. I'm completely stumped and don't really know where to start. Any help is appreciated. Thanks

FSJeeper

Sounds like you let it idle too long. Not supposed to let it idle for more than a few minutes. I used to let my truck warm up in the winter for a long period of time and the same thing happened.

John93CTD

Why did you end up doing?

93-12Smoke

Sounds like air in the system. Check to make sure filter and lines are tight.

1972RedNeck

bump

BC847

Make sure the power lead to the Fuel Shut-off Solenoid is secure. You'll have two blue wires connecting to it. One comes from the ignition, the other goes to the KSB switch.

John93CTD

so what the best way for checking/bleeding the system for air? --thanks

BC847

If you have a profound air leak, the air will eventually make it to the injectors and "Air-Bind" them. You'll need to loosen the high-pressure fuel lines from two or three injectors and then spin the engine over till fuel is seen squirting from the loose high-pressure lines. Now tighten the lines back up, and start the engine. The remaining injectors may still have air in them so the engine will run rough till the air clears out.


NOTE: It is unusual for an air leak to occur suddenly, to the point of stalling the engine like you describe.



FYI: A small air leak may go unnoticed for quite some time as the injection-pump has provisions built in that automatically purge small quantities of air from the pump.

John93CTD

http://www.youtube.com/watch?v=8gWGlVEIbuY, here is a link to my youtube channel of my truck from this morning.

barrytransport

1st whats the temp outside ? Is it cold enough for any water in the fuel filter to freeze ? Have you changed the filter yet ? If you have changed it start cracking injector lines and see if you have a bad injector. The way its running rough and seems to be sluggish when you rev it would make me start with these things.

John93CTD

It's was like 45* when I took the video, and I cracked all the injectors and number 1 and 2 didn't seem to Change the way the truck was running. I have a non innercooled engine in my shop that was good when we pulled it out. could I take 2 injectors out of it and see if that fixes my problem? The. Buy a new set. I know there is a difference between the two but not sure of its enough to worry about?

barrytransport

Since it was #1 and #2 check your water level, see if you have any pressure in the radiator from a leaking head gasket. also you could have a blown gasket between cylinders and not affecting water at all which is where im leaning with the rough idle. and yes you could switch injectors spray angle is diffrent is all but i dont think it will do anything for you. If you have a temp gun shoot the exhaust manifold but again it sounds like 1 and 2 will most likley be cold

John93CTD

So if that part of the manifold is cooler then the rest, it's most likely head gasket?

barrytransport

I think you already established 1 and 2 are your weak cylinders.
Chances of 2 injectors going bad at the same time are pretty slim and since they are next to each other its most likley the gasket between the 2 cylinders or injection pump. Not really a test that i know of for that without taking it off and having it put on a test stand. i guess your chances are 50 50 either way. we used to have the occasional problem on a 4020 with a stanadyne pump of the teflon piece in the pump wearing out and it would do the same thing. When you cracked the injectors did those 2 have the same spray around the nut as the other 4 did ? That might narrow it down a little. maybe somebody else will have some more input

deanhinsley1963

I would replace the fuel filter and fill it with clean fuel. Mine did this and I was sweating. I thought injectors or pump,did the fuel heater delete and new filter and good to go.