@MrScruff per the original issue (Lean codes) I am pretty confident they were caused by a Vacuum leak in the lower intake plenum (loose, missing hardware, etc.) that we found when we put the reman injectors in. But, we certainly have not ruled out the ECU, so let's stay in touch.

I am fairly confident the truck would be running fine had I left the original injectors in and just fixed the vacuum leak. But, I wanted to get ahead of things and do the injectors and here we are!

 

Sounds good! I've been following along, and when I pulled the ECU part of me was thinking it may come in handy because of the gremlins you've been chasing.

If you end up thinking it's needed definitely let me know and we can work out shipping and a try it before you buy it type of scenario, just send me a message.

Good luck!

 

Just got a call from my mechanic. The Disco is ALIVE!

He said the fuel trims were perfect. Halfway through the test drive one of the upstream O2 sensors went out (ofcourse...) and the starter sounds like a dying animal, but no new motor (for now...) for me!!!

 

@MrScruff I've got the truck back. I am not sure whether or not swapping out the ECU will help but here's the recap:

New Bosch Injectors to replace the garbage eBay reman injectors. Mechanic showed me the video of the leaking injector - wow! It was spraying tons of fuel.

Fuel trims were spot on after he installed new injectors, but one of the upstream O2's failed while he was test driving it. I took him a new O2 I had in the box and he installed it. Fuel trims are now not where they need to be, but very close. He reset the adaptive computer and all that jazz.

I've noticed my cats are definitely not working. They tick a little and smell like sulfur when you shut the truck off. I talked to the mechanic about that and he and I agree that the cats could definitely contribute to what's going on.

Do y'all think I should try replacing the Cats before diagnosing the fuel trims further?

My three amigos are no coming on more consistently. Yay!

 

What fuel trims are you seeing? And maybe more importantly, what is the UltraGauge showing for the front O2 sensor voltages? If the voltages are regularly bouncing back and forth, above and below 0.445 volts, the O2s are working fine. Fuel trims are secondary.

What are the voltage readings from the downstream O2 sensors? The sensor readings are a much better indicator of whether or not the cats are operating effectively.

 

I haven't had a chance to look at Voltages or Fuel trims myself yet, but I can take a look on my way home.

I'll post my findings on O2 voltages here.

 

@mln01 for clarification - while I have not looked at O2 voltages since I've had the truck back, the downstream voltage readings are the reason the mechanic is telling me the Cats are shot. I just added that you can smell them, and they make noise. Pretty confident they are toast with all three of those conditions.

 

Cats will not affect fuel trims unless they are plugged, sounds like yours are not. I agree that if the downstream sensors are cycling then the cats are not doing much.

 

Here’s a quick video of all four O2 voltages. Let me know what you think.


Reid (mechanic) found a couple more vacuum leaks while installing the injectors. Throttle body gasket was not used, instead there was RTV sealing it. I noticed this and should have fixed it myself in hindsight. Reid put in a gasket and said there was definitely a vacuum leak there.

Aftwr this almost hydro locking incident the only repercussion app far is that the starter now sounds awful. It will still crank, but I’ve got one ordered to replace it ASAP. I guess somehow the motor messed up the planetary gear in the starter during all of this.

My three amigos are becoming more consistent, looks like I get to diagnose and deal with that as well!

 

Downstream sensors seem to behaving normally, suggesting the cats are doing their job. A little hard to tell without an actual time based graph, but generally looks normal.