missing 6.0 litre

strok'n · Jun 30, 2014

i haven't yet checked fuel pressure. i would think that if it was a fuel issue it would be burbling on more than one cylinder.

powerstrokedkid87 · Jun 30, 2014

throwing out ideas, I only say because we have had some trucks come in before with misfire and come to find low fuel psi, would cause a rough idle. doesn't really explain the smoke at idle though.

strok'n · Jun 30, 2014

yeah i appreciate the idea for sure. i just find it really odd. what is desired fuel pressure at idle do you know?

powerstrokedkid87 · Jun 30, 2014

should be around 60psi

strok'n · Jun 30, 2014

Okay. I still don't think that it would be fuel pressure but I can always check. How do I check the fuel pressure is there a shader valve?

Sent from my iPhone using Tapatalk

strok'n · Jun 30, 2014

I'm new to 6.0 litres

Sent from my iPhone using Tapatalk

Luke@MillerPerformance · Jun 30, 2014

Sounds like the injector harness. Make sure the insulation isn't coming off the wires. The FICM will shut down an injector circuit when it detects too much load or too many shorts on that circuit.

Cutting-Edge Diesel · Jun 30, 2014

It would throw a circuit high/low code if it was that.

strok'n · Jun 30, 2014

the only code that i have in p0266 which is cylinder 2 contribution/balance

RedRice589 · Jun 30, 2014

Welcome! Good luck!

Wayne · Jun 30, 2014

you could very easily have a harness/connector problem where the connection opens up as heat is introduced. Ohm out the #2 injector harness to the FICM & check for loose/ spread pin sockets on the harness. I don't think a whole new harness is all that expensive, especially in comparison to what you've spent. It might be worth it at this point to just put a new harness on, especially considering all the other components you've validated.

strok'n · Jun 30, 2014

thanks for the good wishes. i just peeled back the loom connecting to the injector and found some bare wire wrapped around the 4 existing wires i was wondering if this is normal. also is there ever any problems with it?

strok'n · Jun 30, 2014

so an update. i took the wiring harness off for the injectors and did a pin out test. the good news is all the wires are fine. the bad news is i still dont know what the problem is.

Wayne · Jul 1, 2014

It will pass the pin-out test because it works every time you first start it. Finding the problem only when it heats up is the real nightmare. You have to test it while it's bad or be able to replicate the problem. That's why I'm saying it might make more sense to buy the harness unless you have a good way to test inside the connector. did you ohm test the wires? are you certain the pin sockets have a tight grip on the pins in the ficm and injector end? The metal wrap is normal to control electrical noise/interference.

psdguy95 · Jul 1, 2014

Load test your harness with headlight. That will load the circuit and if something is wrong with it you will know quickly. Thats how we do it at work.

strok'n · Jul 1, 2014

i did the ohm test and they were all good. i dont think that it starts to miss when they get warm because i can turn it off and then back on and the miss smooths out. i was thinking that it might be the harness thats going to the ficm under the air box. i noticed when i first got the truck that there were some wires that had rubbed through on the air filter housing. i fixed the wires that i saw but didnt go into further investigation.

psdguy95 · Jul 1, 2014

Load testing works better then ohm testing. I've seen wires that ohm out good but when load tested showed resistance. Replaced wires and problem solved. That will at least rule out your harness.