HELP! 2006 Toyota tundra very high fuel trims

That was my next question, what the fuel system statuses are currently. I'd want to see you in closed loop (CL) with no faults.

P2195 and P2197 - have you looked at the FSM for diags on both?

Is your truck 2WD or 4WD?

The sucking symptom you describe is concerning, because an air intake leak, anywhere after the MAF would cause a lean condition. Mis-seated intake tube. Open vacuum line. I wouldn't expect a failed intake gasket on the '05-'06, it's a formed rubber gasket versus a flat one. I was going to tell you to consider replacing the upstream sensor, but the sucking symptom you just mentioned has me wanting to understand where that noise is coming from, and if this is just something stupid, like your intake tube isn't fully seated at, say, the throttle body.

 

Forgive me for being ignorant, what is the FSM? And it is a 4wd model. It hasn’t always done this going from open loop fault to closed loop, it’s being very erratic. I have no joke checked for vacuum leak three times, using carb cleaner to see if I can see different rpm changes, done a slightly pressurized smoke test twice now. I’m not perfect but I have really been thorough with looking for a leak anywhere. Unless there are some vacuum lines that are on the very back of the engine I swear I have checked every line. I wish I knew someone with another tundra that I could see if their engine makes the same amount of engine “noise”. It just seems too loud to be normal in my opinion.

 

Factory Service Manual

05-06 Tundra FSM.pdf - Google Drive

 

Oh gotcha

 

Alright guys so I decided to get a second opinion on the truck and took the truck to the shop. I gave them a list of everything that I had done to the truck and just wanted to see what they would say. After talking to them today, they said that I had installed everything properly and sensors were in fact reading. However, they kind of came to the same conclusion as mine. They were gonna have to deep dive into this and look into ECU/wiring problems because that’s where they believe the problem lies. They told me in order to find the specific issue they were gonna charge me $985 and honestly, I really didn’t want to pay up if it’s something I can do. So I am wondering, how do you go about “checking” sensor wiring like the o2 sensors through the ECU? I probably need to go back through the service manual and see how but didn’t know if you all knew the the short version off hand.

 

That info is in the FSM. That's why @The Black Mamba linked it for you.

 

Was able to go through the a/f sensor wiring to make sure everything checked out between that and the ecm. In which I did and I went through the entire FSM for the codes I had and made it to the bottom of it which says to replace ecm. Did find something about the donor engine. After calling and getting the vin from the guy I got the engine from turns out the truck was a 2006 toyota tundra 4wd double cab limited. My truck is a 2006 Toyota tundra 4wd double cab sr5. Have no idea if this changes anything since it's just a trim package difference but doesn't hurt to ask. Was thinking of purchasing the ecm from flagship1 since they specialize in ecm appartently.

 

Should be no difference, I would expect same ECU if same drive (4WD) same cab (DC), same engin (V8), same year (2006).

 

That was my thoughts exactly.

 

Yeah, it's really not cost effective for them to manufacture two different ECU's for just trim levels. Add to that the fact that for the majority of higher trim level options, even if you get the lower trim level, the truck is usually prewired for those 'missing' options.

 

Should I have the ECU programmed to the vehicle vin number or the engine vin number. I thought it would be the vehicles vin but some people on other forums online say that it needs to be programmed to the engine? Which one is it?

 

If you posted your VIN and the donor they can be ran to see if they are the same P/N's.
"So I was able to inspect the ECU and after doing a bit of research, it is the correct one that’s supposed to be in the truck."
What was the P/N on yours? Maybe not a solution to your issues but at least it might answer if the ECM's are the same.