P0272 #4 contribution fault after HGs

[Stoker0560]

05 6.0, Just did HGs and ARPs, new oil cooler RCDs EGR delete, updated STC fitting, Got it all back together, thing fired up after about about 2 min of cranking, (normal), but the idle never clearned up like it should, plugged in the Solus and got a P0272 #4 contribution balance fault, Im fairly confident i installed everything correctly as ive got a pretty descent record thus far, not going to rule anything out though.


the injectors were never removed from the head nor disturbed in any way, the heads were removed with extreme care, the tips all looked good, and re-installed with the new parts. now the thing bucks like a bronco and throws the code. any ideas??

thanks

[justa03]

Dumb question but are you sure the inj is plugged in all the way? More then likely it is or it would be throwing a inj circuit code. Ive had a few trucks that after putting all back together it would miss after initial start. Let it set for a few mins and restart and it would run fine, seems like sometimes they need to set to bleed air outta the HPO system. Other then that make sure you didnt cut an o-ring when you reinstalled the injectors, also make sure the pushrod is sitting in right. Not sure if you can do a relative compression test but if you can with the solus run one and check to see if the cyl is low. Fuel pressure is good? After all that could be a possible bad inj, maybe got some moisture or dirt in it while setting? One thing that could be done is swap an inj with another one to see if it follows the cyl but is kind of a lot of work and i would recommend resealing the injs if doing that.

[Stoker0560]

That seems to be the most common cause is actually bad connection at the valve cover; tomo I suppose ill pull the FICM and check connections along with the injector plug, I may pull the valve cover as well just to make sure all the push rods seated correctly, the truck smokes BAD too, almost acts as if the intake valevs are not opening on there own but as if the vacuum from the piston is sucking air past them with a loud whisp noise, and with too little air fuel ratio simply dumping the raw fuel out with a thick cloud, hope there's no damage though!

I've got this truck plus 2 more 6.0s and a 7.3 in line to get some major performance upgrades (or supporting mods) however you want to look at it, but this is not how I wanted to start off! Ill post tomo the results, any other ideas please let me know!

[sinner6.0L]

#4 is easy enough to get to, pull your valve cover and have a look at your pushrods/ rockers on that cyl

any popping through the intake by chance?

[Stoker0560]

Originally Posted by sinner6.0L

#4 is easy enough to get to, pull your valve cover and have a look at your pushrods/ rockers on that cyl

any popping through the intake by chance?

Yes indeed!

[justa03]

Youve gotta have a pushrod off or a rocker off, especially if its popping back through the intake.

[Stoker0560]

don't know, after work last night I pulled the cover off quick and everything looks in place, the rods are all nicly seated, the rockers are in place and snug, back to the board...

[justa03]

Run a compression test if you can.

[Stoker0560]

Ok dug a little sdeeper, pulled the oil rail and #4 exhasut side rocker and rod were tight as can be while the rest were slightly loose, pulled the rocker and the pushrod was clearly bent, badly bent, now I wanna know why???????

[justa03]

More then likely pushrod wasnt seated on the lifter right. Ive done this myself actually and its a Homer Simpson DOH moment but it happens. Toss a new pushrod in there and fire it back up. All should be well. If you can look down the hole with a light you might see the guide in the HG is messed up cuz it was seated on the lifter right and the pushrod messed it up a little but shouldnt hurt anything.