Power issues since botched water crossing

After a botched water crossing, I ended up stuck and into water up to my door handles on the driver side. I was off camber, with the passenger side up in the air thankfully. Water in the cab was roughly to the top of my seat, but just below the bottom of the center console (Inverter/trans shifter were 100% dry) I winched out within 3-4 minutes of being stuck (winch was completely submerged too) Attached picture was at the deepest point the truck saw.

-Truck got me home, but was misfiring alot.
-I gutted the interior, and used compressed air to blow out every single goddamn electrical connector inside the truck on driver side and spray with contact cleaner. Same with fuseblock under hood (which was wet but not submerged)
-I pulled the plugs/coils to search for water, but they seemed dry.
-Air Filter was dry
-After sitting and drying for 2 days I took the truck for a spin, it ran much much better, but I loose power under load around 3000RPM, like I hit a wall and the engine just drops back to idle, where I can accelerate again.
-I cleared all the misfiring codes before this test run and they did not return
-CEL did come back, this time reporting P0171/P0174 with is system running LEAN.

Looking for suggestions, trying to save this drowned rat
02 Sensors since they would have been submerged?

 

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Um, first post huh. Welcome to TW.

... Tell us a little bit about yourself.

 

great first post... sorry your truck is acting up, and welcome to tacomaworld.

 

Have you been through a tank of gas yet? I know the fuel system is supposed to be sealed, but I would try to rule that out.

 

No, I havent. I am at about 1/2 tank now and above 3/4 when the "incident" occured. I thought about water getting into the tank, especially since the water in the rear was near the fuel cap ( I'm sure there is a vent on the neck ) but the truck idles totally fine and drives fine, until I really press the gas or demand alot of power going uphill.

Feels like its starving for gas (which code confirms)

Not sure how to diagnose a fuel pressure vs o2 sensors vs maf problem.

 

Good news is that the carpet and seats are all bone dry now after a couple days out of the truck in the sun lol damage inside is minimal.

I also drained rear diff as I have extended the breather to the truck bed (which was under water even in the bed) but there was no evidence of water in the oil.

 

water in gas more than likely. Also check engine oil for water.

 

Wow that is just silly

 

How is that possible, when the tank is sealed? I wouldn't put it past something electrical to be shorting, causing a false signal to the PCM/ECM. Does exhaust smell like rotten egg?

 

I would think this would cause a rough idle as well?

 

I would start here:

http://www.customtacos.com/tech.old...06toyrm/06toypdf/06rmsrc/rm2006ta/0050027.pdf

You can do some of the checks on the A/F Sensor your self.

I'm not sure how much the above link will help. But at least you'll get an idea of what path to start on.

Hope this helps. Good luck.

I don't own the manual above. I found it on this site.

 

Negative on the rotten smell. I really dont feel like this is a major electrical issue. Truck runs beautifully at idle and normal driving conditions. Only heavy acceleration/load issues.

 

The same way water gets through the diff vent and seals .... Temp. difference. Gas tank was at outdoor temp and then submerged in cold water. Air and gas contract causing a vacuum and water get pushed in through the vent due to pressure diff.

A bottle of dry gas would not hurt anyway....

 

It is supposed to be sealed, but OP should work simple to complex. I would start by having the tank drained, or add some sort of additive, run it way down, reset codes, and reassess.

 

Sell it

 

^^^ with full-disclosure only, I'd hope?

 

Lol im not going to sell it. Damage is minimal, obviously I'm going to have to work some kinks out after something like this happens. Its not like the entire truck was submerged for a week or something lol. I have been through many many water crossings without issue. I suppose it was bound to happen eventually. If I can fix this fuel issue, truck will be 100%. Everything else is operating completely normal and it drives fine.

 

Happened with me and my jeep, turned out to be water in my distributor cap wd-40 and a rag fixed if

 

Since most gas is 10% ethanol these days anyway - (e.g. equivalent of two GALLONS of dry gas in a full tank!) there's not much point in adding a tiny bottle of dry gas to the tank.

Personally - I wouldn't spend too much time and effort diagnosing until I'd run the tank almost empty and then filled it with fresh gas and driven it for a while to see if the problem was gas related.

Then I'd start with the link TnShooter posted.

I'd check the sensors and relays that it mentions for moisture having entered the connectors - much as you did the connectors in the cab.

Since "fuel pressure" is a thing to check - I'd consider replacing the fuel filter as a pretty easy thing to check/replace and it might have been compromised by the immersion.

One thing that seems like a possible cause that'll be a royal pain to check is that the fuel pump itself may have been damaged by the immersion. I'd access that to replace it only after having confirmed the problem by doing a fuel pressure test.

As others have said, move through the things that are simple to check first, on through the things that are hard to check last.