After installing the new injectors and bleeding the air out of the lines I now have a miss at all RPM's. It really stumbles bad under a load above 2500 RPM's.

I went from the stockers to Jammer 5's and I took my time to make sure all parts were the same going in as they were coming out. The only issue I had was one of the copper washers turned sideways in the head and I had to use a pick to pull it out. It bent slightly but I flattened it back out with a flat hammer and reinstalled it.

There are no leaks and fuel pressure is good according the Edge monitor! Not sure if a dirty sensor would cause this or if my VP44 is causing it but I have no codes and no check engine light. Everything looks fine except the Miss!?!? Any help would be greatly appreciated.

Thanks,
Josh

 

could you possible have one of the injectore 180 dgrees off and the feed tube not seated?

 

No, the miss isnt a completely dead cylinder. Its more like a misfire or leakage of some sort but theres no fuel visible. I picked up 6 new copper sealing washers and will be installing them to see if thats the culprit.

 

When mine did that it was cause I'd missed tightening one of the lines at the VP,but that made itself known quickly with a puddle of diesel,I'd bet its your hammered washer...check for diesel in oil?

 

No diesel in oil and I replaced the washers... NOW WHERE DO I LOOK??????? Could a boost leak or fuel line leak cause these symptoms?

 

If the injectors are new and not new nozzles installed on old bodies, I'd
take the valve cover back off, loosen the injector retainers, loosen then re-snug the fuel fittings, tighten the injector retainers then tighten the fuel fittings.
If you can locate the spitting cylinder by finding the cold exhaust port after starting the motor cold, you might take that particular injector to an injector/pump shop and ask them to pop test it...any tiny piece of trash can plug up the needle hole in the nozzle.

Watch your exhaust temperatures, my original head gasket is hanging on a nail for inspection in my workshop...coked & cracked gasket composite material from overheating allowed oil into my cooling system.

 

Update... not the truck is getting hard to start. Cranks for around 15-30sec before starting! Doesnt that mean I have a fuel leak between the pump and injector?

 

Yep, likely to be loosing prime.

 

I do agree that hard starts mean there is a leak. But also wouldn't it be possible that it could be starving for fuel under throttle because of stock fuel lines and pump.

FOR INFO:
I will add that I have a pretty good miss when towing (runs great when not towing) and have been clearing VP death codes for almost 2 yrs now. The codes started after installing the DD2's. I just take it easy going up the big hills here and don't lay down the throttle. The clock is tickin on my IP.

 

Good point Copenhagenjunkie, let's ask.

Hey JIT, how's your fuel pressure under load?

 

18psi under load at WOT... 26psi at Idle! Maybe the oposite... too much fuel???

 

Maybe...many folks have hard starts with idle pressure over 20 psi.

 

I got the hard starting problem fixed. Had a couple bad battery terminals and a battery that was not up to par! She starts great now and idles a lot better!I also found a fuel leak on a fuel line going to the back of the head!?!? Does anyone know what this line is for?

 

wow, im jumping on board this one

 

Not all fuel pumped to the Injector Pump is used, some for one reason or another is returned to the fuel tank.
The line at the back of the head is the injector return fuel line. It connects to the injector pump return fuel line and returns fuel back to the fuel tank.