Running lean, symptoms

[Gianni]

So my car is running lean (via air fuel sensor off a new icy sensor)

Set up:
Stock vr4 motor
Evo 510cc injectors
Stock Evo pump
Evo 3 ecu
Td0516g (which has cracks in the exhaust housing)

Besides the turbo being a problem, what else could cause it to be lean. How can I bring it back to optimal. Timing idle ect is fine. Is there a way to reset the ecu like in a supra where it re tunes itself. Ect

 

[brisvr4]

If the exhaust housing of your turbo has large cracks it will be drawing in air which will make the o2 sensor think you are lean.
You might want to check the fuel filter as well though.
To reset the ecu all you need to do is disconnect the battery for a few minutes.

 

[Gianni]

Oh cool. I'll try that. Fuel filter and everything have proba done about 1000km. Ha ha ha. Cracks are between wastegate and exhaust not to exterior

I'll reset the ecu see if it help. Do I have to run it for a certain amount of time? Is there a process to it

 

[Lister]

Which afm?

 

[Gianni]

Evo 3

 

[Lister]

Piping leak post air flow meter, pre turbo.

 

[Gianni]

Hmm. I don't think I have a leak there. I'll double check

 

[Lister]

Narrow band o2 sensor or wideband? And how lean?

 

[Gianni]

Well it's not registering on the meter. And it use to run just under. Stooped after a cooler hose popped off

 

[brisvr4]

Is it a real wideband is what Lister was asking. Or just the pretty blinking light af meter. (which makes good landfill!)

 

[Gianni]

Um not sure honestly. Was around $100

 

[Lister]

Does it wire into the stock vehicle harness? Also which fuel pump are you using? What air fuel ratio was it telling you? 14:1. 15:1, 20:1?

 

[Gianni]

HHonestly never dealt with this stuff before. Stock Evo pump and wired off the oxy sensor. I can go off the loom if I wanted to. Got sane signal, just didn't want to splice loom

 

[Lister]

Sounds like a narrow band afr meter. Really not worth the $$$, or time spent installing it. You need to get a wideband o2 sensor on it, or get it on a dyno. That way you will get an accurate, and well informed picture of what its actually doing. Both off and on boost.