Need HELP!

[Summers22]

Good approach, I bet a stuck injector caused the old cat to melt, prompting the owner to cut them out and not address the root cause.

 

[CHSimon3]

Well, it's been a few. Work and life held me up. I was able to get back at it this weekend. New cats and injectors. But left with more confusion than before. When replacing the big catalytic converter I discovered it had actually been gutted. So why that was having any affect on my situation is beyond me. But it got replaced anyway.
And now, I've got a new issue. System rich both banks, with a slight misfire/stutter issue. And grayish smoke out the tail pipe, it's not white or blue. But it gets worse as the engine warms up. Almost none when cold to fogging out the neighborhood thick once up to operating temps.
There was some oil residual in the intake, noticed when i removed it to change the injectors. PCV rattles when shaken and don't have a code for it, so it hasn't been replaced yet. Guess that and 0² sensors are to be next.
Obviously, I'll take any advice given. But I'm just really updating so that maybe my problems will help it someone else!

 

[I support common sense]

Maybe try disconnecting your pcv and plug both ends with a towel. Normally if it were burning oil you would see blue smoke. Grey smoke indicates a rich fuel mixture, which lines up with your codes.

Have you checked your fuel pressure? It’s possible your regulator isn’t working at all.

What kind of injectors did you get?

 

[CHSimon3]

Maybe try disconnecting your pcv and plug both ends with a towel. Normally if it were burning oil you would see blue smoke. Grey smoke indicates a rich fuel mixture, which lines up with your codes.

Have you checked your fuel pressure? It’s possible your regulator isn’t working at all.

What kind of injectors did you get?

Fuel pressure was good when my problems started after the head replacement. KOEO 44lbs and Running was 50lbs. I didn't have time to check after the cats and injectors were installed. It just got too late. I'll recheck Friday when I get back to it.
I got Denso OEM injectors.
Part # 4L5Z9F93A

 

[RobWigglezz]

Any chance the new cats just need to burn off some crap inside?

 

[CHSimon3]

Any chance the new cats just need to burn off some crap inside?

I wondered that as well, it's the codes and stuttering that have me looking deeper.

 

[RobWigglezz]

Have you done a compression test with the new heads? Maybe some exhaust valves are hanging open slightly, allowing raw fuel to get into the exhaust. Maybe a cylinder or 2 would show less relative compression to the others. Not really worried about the actual number, just the difference between them.

 

[CHSimon3]

Have you done a compression test with the new heads? Maybe some exhaust valves are hanging open slightly, allowing raw fuel to get into the exhaust. Maybe a cylinder or 2 would show less relative compression to the others. Not really worried about the actual number, just the difference between them.

I did do one after the install of the new heads. Had 160psi +/- i think 4psi on all 6 cylinders. I'm gonna do a smoke test as well on the intake, exhaust, and evap systems this weekend to verify no leaks anywhere. And although I'm not getting codes for bad 0² sensors, at this point replace them as well.

 

[I support common sense]

You said that it’ll smoke out the neighborhood when warm? That doesn’t sound like it’s running just a little rich. It’s gotta be pulling some serious fuel to run that rich. I know it’s probably a pain, but could you pull the spark plugs and see if they are fouled, or at least take a couple of photos and see if it’s a specific cylinder. I believe they will tell us the issue here.

 

[CHSimon3]

You said that it’ll smoke out the neighborhood when warm? That doesn’t sound like it’s running just a little rich. It’s gotta be pulling some serious fuel to run that rich. I know it’s probably a pain, but could you pull the spark plugs and see if they are fouled, or at least take a couple of photos and see if it’s a specific cylinder. I believe they will tell us the issue here.

My plan is to test the injectors Friday. By trying the "clear flooded engine" mode trick. Ignition on, pedal to the floor, then crank it. Then I'll pull the plugs and see if any are wet. But I'll take pictures and label them when I do it.
Again, I appreciate all the advice and trouble shooting help. From everyone

 

[I support common sense]

One more thing that someone mentioned in another thread is viewing live engine data. The forscan and USB adapter has been recommended for detailed diagnostics.

 

[RobWigglezz]

One more thing that someone mentioned in another thread is viewing live engine data. The forscan and USB adapter has been recommended for detailed diagnostics.

Here's 2 logs I did yesterday. One cruising and one at idle after. Super easy to tell if O2s are working properly

 

[CHSimon3]

I tried the "Clear flooded engine mode" trick and pulled the plugs after. Plugs on cyl 4 and 6 had residual fuel but by no means soaked.

 

[CHSimon3]

Also, I had just ordered an Autel scanner. And did record fuel trim data at idle. Currently not attempting to drive truck. But this is a screen shot of said data. In all honesty, I don't truly understand the fuel trim data. So feel free to dumb it down for me!

 

[SenorNoob]

Looks like the short term fuel trim is almost maxed out in the negative. That would imply the egnine is getting fuel from somewhere other than the regular injector function or that air is heavily restricted.