Possible engine failure help

It would NOT be even across rpm range. When the engine is running faster, it is pumping harder, and thus may be able to overcome that restriction to some degree.
Add the high compression numbers, and you're plugged up.

Unbolt the pipe before the cat, and start it up. $10 says it runs better than its ever run, albeit noisy as hell.

You need new cats AND new sensors.
Could have saved the cats by changing the sensors back when they went bad.

 

Popcorn isn't enough, need a little bit of booze also.

 

LOL

p0031 is air fuel sensor heater circuit code,

you know that the air fuel sensor being 100% functional is required for the engine to run correctly
of course you do, you are a mechanic

 

P0031 is bank 1 sensor 1 o2 heater circuit, p0051 is bank 2 sensor 1 heater circuit. What do they have in common? Power.
OP, time to spend money and fix the initial problem. Fix the power supply problem, then fix the issues it caused. Go to URD and get a DTLT header set and a DT "Pipe Bomb", replace you o2 sensors and enjoy a truck that runs.

 

While I was out I stopped by advance and used the scanner since you can view cat temp on them.
I also put he o2 readings on there to compare and as u can see the voltage on sensor 11 and 21 is way to high meaning the system is dumping way to much fuel in to the motor.... hence the bad cats

 

Atleast I'm not claiming to be something I'm not you hack

 

C'mon now. Take the high road.
The problem (original and now) has been pointed out. Up to OP to get it fixed, though it is a shame to let a known small problem grow to a point where it cost more money. But, since more is now needed, great time for mods.

 

A engine is a engine, electrical is electrical and a transmission is a transmission. Any respectable tech should be able to figure out the problem. It Doesn't matter what you work on the theory is all still there. And I'm sure your neighbours were pumped to get work done by a uncertified mechanic that does a crappy job. In my opinion that's no better then getting good screwed by a jerk mechanic. I put my time in did all the schooling. And it's people like you that leave a bad taste in people's mouths about mechanics, but hey its also because of people like you that I still have a job I think it's great when I'm told they took their car to some know nothing know it all that messed up their ride. Claiming to be a mechanic. It's OK I'm the vice president and I declare you a idiot.

 

yeah you are being a little harsh

but i cannot disagree

if someone here claims they are a mechanic, it implies a keen understanding of how to troubleshoot a problem
correctly and not hack around.

#1 tips for any backyard mechanic or handyman or whatever the heck you call yourself (I am an engineer, I can solve a load of
problems) on the forums, is spend time at techinfo.toyota.com first and troubleshoot your issue using the toyota flowcharts for diagnosis,
and not some shitty haynes manual

 

And WHY do you think it is dumping in too much fuel?
Hmm?

You need to quit screwing around with diagnostics, the problem is concretely identified. Now go fix it already.

 

This is what we need more of. Thanking m thank you for the useful post.

 

I just ordered jba LT headers and the o2 sim from urd along with new toyota a/f sensors as the aftermarket ones don't work as I have found in the past on this truck.

 

How is that going to fix your catalytic converters?

 

Long tube headers get rid of the upstream cats (attached to OE manifolds), O2 sims alter the signal from the o2 sensors to make the computer think it is seeing the correct parameters.
You still need to make sure that the power is going to the o2 sensor heaters (original problem).

 

Why not save money and just gut the existing cats? Less work, too.

 

^LT headers can give a power boost at higher rpm.

 

The issue with punching out the upstream cats is that it will introduce turbulence in the exhaust stream close enough to the manifold that it could nagatively effect performance (though it is an improvement over clogged cats). That is one of the reason that test pipes have become more common over punching out the cat(s).

 

I'm so glad I came acrossed this thread.