AFR issues, lean until a hair off throttle then rich??

At idle my afr reads 14.7 also at cruise throttle. However, getting into boost maybe at 2lbs its still in the 14s as well as when i mash maybe half-3/4 throttle itll be roughly 13s high 12s. Weird thing is when I barely let off not letting the rpms drop any the wideband drips to low 11s where it should be. If i mash the skinny pedel 80% or more it's running lean almost like the afr starts to go rich but will jump lean as soon as the pedel gets lower to the floor. But if I let off not even a hair it richens all the way to 11. Something is off but what is it? So confused at this as sometimes it goes rich and stays there but sometimes it shows "lean" numbers Could the 02 sensor be going bad? Maybe just the wideband itself?
If it helps. Magnusun charger 3.0 pulley BD tune, airaid TBS, K&N cai and fpr mod.

Mahalos in advance for all help given

 

I have a supercharged 1st gen but part throttle enrichment is a well known issue, at least for 1st gens...meaning if I mash the pedal to the floor I'll see good open loop numbers but if I give it half throttle (~2lbs of boost) it'll stay in closed loop numbers around 14.7 for 3 or 4 seconds before it will add fuel and start to show richer numbers. Takes a few seconds for the ecu to adapt, If that makes sense.

Do you have any fuel mods? 7th injector, methanol, bigger fuel pump, etc?

When you let off the throttle your gauge should read lean not rich, since you aren't adding any fuel to the mix by not having your foot on the pedal. Seems odd that its reading in the richer when you let off the throttle...if I'm understanding you correctly.

The part about 3/4 throttle and AFRs in the 12s sounds about right to me but I'm still learning this stuff myself. I see AFRs in the mid 12s at 3/4 throttle and AFRs in the low 11s at wide open throttle.

Do you hear any pinging at all?

@12TRDTacoma will have better advice for you on this stuff

 

7th was taken off but I have it in the box from previous owners, bigger injectors that came with the charger and a walbro 255

When I'm on the gas maybe 50-75%it'll be in the lean side but if I literally just let off a hair it will shoot down to the 11s almost like it realized it should be more rich and the boost Guage needle acted accordingly. It's intermittent, sometimes it will go rich no problem and sometimes it will do as described. Should i get a bd to see if there's an update or maybe the wrong tune? Previous owners didn't include the handheld.

 

@eon_blue no pinging that i can hear. Smooth whining

 

So you bought the truck used and the supercharger was already installed? Was it a Bully Dog tune that they used to tune it?

Since it is a 2013/2014, it’s possible that you have the same issue with the tune that I had. My truck had all sorts of crazy issues after installing the Bully Dog tune.

What fixed it for me, was getting another ECU and instead of doing the Bully Dog tune, I flashed the ECU with the Toyota TRD flash.

 

Staying at 14.7 while under boost temporarily until fuel enrichment kicks in is normal when you have the fuel pressure regulator mod hooked up.

If you don't hear pinging and are somewhere in the 11's under 3/4 to full throttle you have nothing to worry about.

 

Why is it that the fpr mod makes it stay at 14.7 while in boost? Would it be better to re route it back to the intake tube? Mahalos for the help both of you

 

@loginfailed I was told they used the bd tuner the female side of the connecter for the tuner is hooked up by the obd port

 

The tuner plugs in and once the flash is done, you can take the tuner out. It doesn’t have to stay plugged in.

So the bully dog is still in there? If there’s something plugged into the OBD2 port, follow the cable and see where it goes.

 

AFR changes based upon how much load input is being seen by the ECM. You will not see fuel enrichment required until the engine demands it it. Let's say you are going up a steep incline, AFR will adjust accordingly based upon calculated load/throttle position. You may be making 6psi going up a hill but it is a different 6psi in comparison to as if you are driving across flat land.

I run up to 12 psi thought the FPR mod and have been doing so for the last 40K. Your engine will not grenade as the FPR mod is the safest mod you can possibly do for a boosted application as the fuel pressure varies based upon rising boost.

 

OK good to know mahalos. It's not in the obd port its right to the left of the good latch lever. I will trace it and see where it goes. What does the bd have for adjustments that you can change? Besides the ability to monitor parameters

 

That makes sense mahalo for the info, in new to the Supercharger world so I appreciate all the info I can get. I don't want to grenade this thing I'm loving the whine

 

Not a problem brother. The whine is highly addictive and the higher the boost the louder the whine. There is a dedicated thread I have created for all boosted bros to jump in on and weigh in, give their own tips, share info, BS, whatever. It gets posted on regularly and folks get back to you there lightning fast if you have a question in comparison to these threads because they get lost so quickly by other random threads. I encourage to jump on there and get started having some fun!

https://www.tacomaworld.com/threads...4-0-supercharger-tips-tricks-and-mods.518932/

 

There’s a ton of supercharger info on the forum for you to digest.
https://www.tacomaworld.com/threads...4-0-supercharger-tips-tricks-and-mods.518932/


Some of Bully Dog issues were discussed here, as well as a lot of supercharger installation discussion.
https://www.tacomaworld.com/threads/closed-20-off-supercharger-group-buy-2nd-gen-4-0-engine.454464/

 

I will! Mahalo nui for all the info I'll go check the thread out when I get time!!

 

Mahalos! I appreciate the help, I might ask some silly questions but I'm trying to take in all that I can asap.

 

So Tim from magnasun tells me the reason why it's running lean is because the k&n intake. He is me if I go back to stock it should run better because it is tuned specifically for the stock intake. He also told me they only have a tune for the 3.0 pulley not the 2.85.is that true?

 

Interesting, granted i have the trd tune....ive ran the urd, k&n, stock, and afe stage 2si and never had lean issues in open loop.

 

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I'm going to open get the ecu number and find one on ebay to flash that trd tune everyone talking about. Seems as though I never hear anything bad about it. However, fwiw I put the stock intake back on with a k&n drop in and the numbers were a lot more rich when in boost 75% pedal about 12 and pretty much WOT was low 11s.so that fixed that but in gonna see how it reacts over some time so the ecu can get to learning again with the stock airbox back on.only gripe is that it doesn't sound as cool anymore when you get on it