Help 7.3 missing, no codes, did buzz and contribution tests

[Probuilder]

Ok so you are saying that it maybe the compression and not the injector? Even though the buzz is very dull in sound, on the buzz test?
I will try to find someone that has a compression tester for these trucks.
I have just about had it with this truck, I am looking for a 7.3L that is newer so that I get more info from the scanner, than I do with the E99 systems.

[88Racing]

Is this resolved?

[cleatus12r]

I had left a bit of a resolution on the service ticket that Troy started, but have yet to hear back about it. If you can leave this thread open for a bit, I'd like to hear back from him myself.

[Probuilder]

Cody,
I have replaced the #7 and #8 injectors, but to no avail, I still have the problem. It don't seem to be as prominent, but still has the miss. I am in the process of going back through every check that everyone suggested prior to replacing the injectors. Does anyone know what this motor should have for compression, and what is acceptable?
I am about ready to buy a bow tie, if I cant figure this out.

[Power Hungry]

We need to get you down here for a weekend and see what's going on with your truck.

[Probuilder]

you are a long way away from me. Otherwise I would get it to you, to figure out.
I am looking at a different truck, that way I don't have these problems.

[cleatus12r]

Troy,

You need AT LEAST 340 PSI while the engine is luke warm. A HEALTHY engine will usually be in the 370-400+ PSI range. Anything lower will usually cause a miss until the engine warms up or the boost comes up a little bit.

Low compression will usually be accompanied by white smoke from the exhaust that burns your eyeballs if you stick your face in it.

[SICKS-O]

did you do a buzz test with the new injectors in 7 & 8?

[Probuilder]

SICKS-O did you do a buzz test with the new injectors in 7 & 8?

Yes all good.

Here is what I have done since last post.
Did the buzz test, everything sounds good on all 8 cylinders. Contribution test is good on all 8 also.
I am lost as to what is going on here.
Now the truck doesn't have the miss, but also has very low power even with the FU chip on 100 hp setting. It feels like the chip isn't even in the truck. my boost used to go to 26-28 psi now it only goes to 15 psi max, blows black smoke really bad. Even smokes on the idle, it is also black, sitting in garage for 3 to 5 minutes, when warm and idling, will burn your eyes really bad.
Oh MPG is down to average of 8.

I took the new injectors out of 7 and 8, put old ones back in, truck still has no miss, but the rest is still the same- no power, smokes on idle when warm, smokes driving it, with the FU chip in.

Take chip out and everything runs perfectly. No smoke, no miss, nothing, and has power, contribution test good, buzz test good, boost up to 26psi, 16 mpg average. I am LOST

Any ideas now? Ready to trade truck off, but can't with it running like this.

Could there be thick oil trapped in a injector boss that causes the solenoid to buzz correctly but injector not work right??????

[Probuilder]

I have also thought that it was the chip connection. So I have pulled the chip out and reinstalled it, after checking the connections, still no different.