Intermitten smoke 09 V6

Ok my gear head brotha's of other motha's I have 132,800 on my truck. I get on my code reader( very expensive one) bank 2 PO430(catalytic converter(s), and the PO112(IAT Sensor) and PO104(MAFS).

I ordered from eBay the mafs(found one for less than 20) and the box said toyota, lexus and it looked like mine so I said......SCOOOORE!

But I am seeing intermitten smoke, like after it has been running, but not real long, like it's still getting its moisture out of the exhaust or IS THS UNBURNT GAS? I am getting horrible fuel mileage and with the gas prices I am feeling the OUCH OF THE PINCH IN MY WALLET! Also, the smoke goes away. I have not yet to smell my exhaust to see if it's sweet or not(head gasket).

ANSWER ME THIS PLEASE:
WILL THESE THINGS CAUSE SMOKE TO APPEAR. My mileage has been really bad for a long time. I DO NOT SEE SLUDGE ON THE DIPSTICK OIL, OR SLUDGE IN THE ANTIFREEZE(tell tail head gasket stuff).

I just took off my intake and replaced the upper gaskets, but could not get the intake manifold off to replace the lower gaskets, I even broke a bolt off after I impacted wrenched them on( a job for later extraction......UGH!). I also drained my radiator and put fresh antifreeze in.
https://www.youtube.com/watch?v=-RC9x7mEdRo&t=35s
This is the video I watched. It's pretty good, but somethings weren't too exact. I did it @ night after a long day......DUMB! I just did it Monday and Tuesday 4/4/22-4/5/22

HERE IS THE IMPORTANT THING: A WEEK AGO I SEAFOAMED MY ENGINE THINKING IT MIGHT HELP THE CAT UNPLUG, BUT EVER SINCE I DID THAT I HAVE BEEN SEEING SMOKE( it was a week ago). My cat is still plugged according to my OBD II reader.

My truck has a miss feeling @ idle @ a stop light. The cat has been flagging for sometime, but I think I ruined my MAFS and IAT sensor when I took off the whole intake manifold plastic thing.
Are they the same thing? https://www.youtube.com/watch?v=e0c3gzm9464
That video says they are? My truck is a 2009 1GRFE.
Thanks for the help. My 2001 3rz and my 2002 5vz did not have the problems this Tacoma has. What gives?
Brian

 

The IAT is part of the MAF sensor.

Smoke on start up isn’t uncommon when the temperature is cold outside.
This type of “smoke” is “condensation. And is worse until the engine and exhaust are warm.

What are your fuel trims on the scanner?

 

I have no idea if this will help. Take with a grain of salt. I have a 2nd gen 4 cyl and my cat went bad. It took me a long time to diagnose eventually the grid in cat broke loose and would occasionally move around and block the exhaust from exiting the cat and the engine would bog down and I would get bad smoking. I only have the one cat and the issues would be more pronounced than someone with multiple cats and one causing a blockage.

I ended up gutting my cat with a piece of rebar and it runs great just louder and the check engine light is on but that stuff doesn't bother me.

MAF cleaning spray could help as well. None of this may pertain. I'm just guessing here from my limited experience.

 

Thanks guys, and yes, I know smoke on start up is normal, but sometimes I get a puff after it has been warmed up slightly, like when I'm stopped. But JvStarr88, you may be onto something. There is a slight miss @ idle in traffic, but my power is great. I hop the clutch and vroom.
But listen to this, and if anyone else got a better deal on new manifold/cat combo.....LET ME KNOW. I bought on eBay a manifold/cat combo's for both sides for $160.16. That was good I thought, YOU?

Any more help would be great. Once again, my 01 and my 02 tacoma's were trouble free. This one...SMACK MY FOREHEAD!
Thanks,
Brian

 

Thanks TnShooter for the info too. My MAFS is on its way.

 

I cleaned my MAFS all the time with Seafoam, and I did the other day. No better!

 

P0430 means unburnt fuel is emitting from your exhaust, so its more visible. It will smell worse as well.

 

I had an old Hyundai, and the cat got plugged in it. From a start, it went no problem, from about 35mph and up, it bogged, and wouldn’t go above 40mph.

 

It takes off fine, lots of passing power. I think since my truck has 4 cats, they compensate for the weaker one. I'm only guessing of course.

So Bishop, you could be right, but meaning it could just be getting worse, the cat that is. OPINION?!

 

Trying to understand the sequence of events here.
Was all of this happening prior to you pulling the intake or did it start after?

P0420/430 doesn't necessarily mean the converters are plugged, it means they are no longer functioning effectively.
A simple backpressure test can rule out a plugged converter.
If you are getting poor mileage and seeing brownish black smoke that tells me the engine is running excessively rich (which will overheat the converters and eventually kill them), I would want to see fuel trims idling and driving.
The MAF sensor is the main sensor the engine uses for fuel and timing calculations so if it's not working properly engine performance and economy can be very poor.

If you found a "Toyota" MAF Sensor for $20 on Ebay it is almost certainly counterfeit and will either not work or work very poorly.

 

The only thing that happened after pulling the intake manifold was the MAFS. The cat was doing this for awhile.
I hope I don't get ripped off about the MAFS. I will probably get a JET BRAND

 

you guys have asked about fuel mileage, well, I can't hardly get 120 miles out of a 1/2 tank of gas. I don't take my mileage, but I used to get to the 3/4 mark 100 miles, and then to the 1/2 mark 180-200 miles and a tank 335-350.

Now, I can barely get 200 miles out of a tank, maybe 225. So my mileage is ABSOLUTELY HORRILBE to quote pompos Simon Cowl(sp?)

 

The fuel trims will help give you an idea.
That’s why we asked you about them earlier.

Take a look at them and let us know what they are.
Long term most importantly.
But short will help also.

Until you get the MAF situation fixed, there really isn’t much that you can do.
MAF will throw off everything else.

 

I'd follow his advice up above. The $20 eBay MAF sensor is probably counterfeit and causing your truck to run rich, ask me how I know. I bought what I thought to be genuine fuel injectors for my 1st gen Tacoma, packaging and part numbers matched, but the font looked a bit different than the normal Toyota part. I got it for a steal of $50 for all 4 injectors, the dealer wanted $200 for each injector. My truck immediately threw a rich fuel trim code -25% fuel trims at idle. I remove the injectors and put the original ones back on and the problem went away. Long story short if it's too good to be true, then it probably is. A MAF sensor is a very important sensor that tells the ECU how much air is going into the engine. If it can't precisely determine that, then you will have driveability issues, like running rich or lean, stumbles and hesitations. A MAF sensor isn't something I would go aftermarket, at the very least get the Denso which is OEM.

 

I'm also kind of curious how you got a p0104 as it doesn't appear to be a valid code for a 2nd gen Tacoma

 

The P0104 was on there for sure as was the P0112 and the P0 CAT CODE(forget the code now-P0430?).

I hope the eBay thing isn't true, but I hear ya loud and clear. I might just go with JET PERFORMANCE.

I haven't got the MAFS yet, but I'll will keep you all informed. Thanks for the other stuff highlighted above, I will look through them soon. I have gotten on TTORA, TOYOTA NATION, ECT, but I find more info here than anywhere else. Thanks for the help always.

Also about the fuel trims, I can't get 150 miles on a half tank, when I was getting 200+ @ one time. I could get to the 3/4 mark @ the 100-110 mark(depending on headwinds here in the prairie-BLUSTERY)!

Brian

 

Fuel trims are shown on the scan tool.
They read in + or - percentage.

 

Isn't seafoam kinda oily? Putting it on the maf would gum it up? I know others have had success with crc maf sensor cleaner, me included.

 

If I clean a MAF Sensor I use a cleaner that’s list as MAF Sensor safe.

I have 157k miles on my truck. I have never cleaned mine. And don’t intend to until I need to. Sure, it’s not a bad idea to clean it every once and a while. But I’ve done my share of breaking stuff that wasn’t broke to begin with. I try not to do that any more.