I have a miss. help please.

[kf6ivi]

I had put a new to me used engine in my truck. Over the entire engine looked very good from exam, Newer remanufactured short block, fresh heads. Glow plugs look brand new.

I put new injectors because it had old mismatched injectors I also installed a new return line kit.

I have two injector caps that have a small leak of fuel on them. I have changed o-ring twice and change the injector caps and they still have a fuel leak although smaller then it was. Would a cracked injector line leak like this?

The engine starts very fast. This is the fastest starting diesel I own. It starts very well when cold at 20 degrees without being plugged in.

I how ever have a miss. It is not as bad at an idle. It increases with rpms. It is not steady it kind of is hit and miss. The motor drops with all cylinders the same when I open the injector caps. I can’t track it to one cylinder. The engine has no knock to it. It seams to do it more when the engine is warm.

I have the injector pump and lines from my old engine. I am thinking about put them on to see if this makes any changes. What do you think?

Any other ideas I might be missing.

Thanks Ethan

 

[kcw12]

is it leaking out the top of it. It sounds like you got a cracked line, take the old lines on them cylinders off your old motor and put them on there. see if that fixes your miss. I have a couple lines go bad on mine did the same thing. It isn't good.

 

[69oiler]

my money's on the injector pump.

 

[Double-S-Diesel]

IP is my guess

 

[kcw12]

he says he has fuel coming out the injectors on two cylinders. if the top of the injectors/lines meet is leaking fuel, it will miss like a mad man. Trust me been there done that got the lines to prove it. If its not the lines, id say its the pump.

 

[oldmisterbill]

Do you use fuel conditioner? On my 7.3 if I don't use conditioner I have a slight low RPM miss that goes,untill I use conditioner.It takes a while but will come back eventually if I stop using conditioner.

 

[whitebear]

87 F250 6.9 i have a miss @ idel to about 1200rpm i sometimes goes away cant figure it out i used a aditve and dosnt seem to work Help please

 

[FordGuy100]

87 F250 6.9 i have a miss @ idel to about 1200rpm i sometimes goes away cant figure it out i used a aditve and dosnt seem to work Help please

Sounds like you have a bad injector. Maybe air in the lines as well. Does it just miss, or does the truck shake real bad when missing?